Urban heritage as climate intelligence: translating traditional urban morphology in AlUla into contemporary resilience frameworks

Abstract

Introduction:

Urban environments in hot-arid regions are increasingly exposed to thermal stress that undermines walkability, outdoor usability, and district-scale environmental comfort. While contemporary responses emphasize building-level technological solutions, historic urban fabrics demonstrate that climatic adaptation can be embedded within urban morphology. This study reconceptualizes urban heritage as climate intelligence, examining how traditional spatial configurations regulate thermal exposure and support resilient pedestrian environments.

Methods:

Using AlUla Old Town in north-western Saudi Arabia as a district-scale case study, the research adopts a qualitative–analytical morphological approach. The study applies a structured codebook linking spatial features, such as compact blocks, hierarchical street networks, enclosure, permeability, nodes, and thresholds to inferred climatic mechanisms and resilience outcomes. Analysis is based on mapped morphology, visual documentation, and literature-grounded environmental interpretation.

Results:

Findings indicate that climatic resilience emerges cumulatively through the relational organization of urban form. Compact block aggregation contributes to thermal buffering; hierarchical and redundant circulation networks enable protected pedestrian continuity; enclosed narrow lanes reduce solar exposure; and distributed nodes and layered thresholds create comfort gradients and adaptive transitions. These elements collectively support shaded route continuity, microclimatic stabilization, and sustained walkability at the district scale.

Discussion:

The study demonstrates that environmental performance in hot-arid contexts can be structurally embedded within urban fabric rather than added through technological systems. By synthesizing observed form–climate relationships, the research develops a four-tier resilience framework linking morphological inputs, climatic mechanisms, resilience outcomes, and design and policy actions. This framework provides a transferable pathway for integrating heritage-derived spatial intelligence into contemporary urban design and governance, emphasizing that durable climate adaptation depends on how districts are spatially composed rather than solely on building-level interventions.

1 Introduction

Urban environments in hot-arid regions are increasingly challenged by rising temperatures, extended heat exposure, and declining outdoor comfort, conditions that directly affect walkability, social life, and energy demand (Aljawabra, 2014). Contemporary responses to these challenges have largely emphasized technological and building-scale solutions, including mechanical cooling systems, high-performance envelopes, and digitally optimized environmental controls (Chen et al., 2024). While such approaches have contributed to thermal regulation in controlled interior environments, their effectiveness at the urban scale remains limited, particularly in addressing pedestrian experience, public space usability, and cumulative microclimatic performance across districts.

Historic urban settlements in arid regions offer a fundamentally different model of environmental adaptation. Their spatial configurations characterized by compact block structures, narrow and shaded circulation networks, hierarchical streets, and layered thresholds were shaped through long-term empirical responses to climatic stress rather than formal environmental modeling (Mosharraf, 2023; Almahdy, 2020). These settlements demonstrate that thermal moderation, comfort, and resilience can emerge from the organization of urban form itself, operating at the scale of the street network and the district rather than the individual building. As such, urban heritage in hot-arid contexts can be understood not only as a cultural or architectural legacy, but as a repository of embedded climatic knowledge capable of informing contemporary resilience thinking.

This perspective is increasingly supported by recent scholarship that situates heritage environments in hot-arid regions as active contributors to sustainability transitions and climate-responsive design. Studies have demonstrated how traditional settlements in the Gulf and comparable arid contexts encode environmental strategies that remain relevant under contemporary climatic pressures (Salameh and Touqan, 2023; Alharthi et al., 2025). Furthermore, emerging research on environmental performance in hot-desert climates highlights the sensitivity of built environments to thermal and atmospheric conditions, reinforcing the importance of spatial configuration in mediating microclimatic exposure and indoor–outdoor environmental interaction (Jung et al., 2022).

This study advances the position that urban heritage should be interpreted as climate intelligence, defined here as the capacity of traditional urban morphology to regulate thermal exposure, enable pedestrian movement, and support microclimatic stability through spatial configuration. The climatic mechanisms discussed in this study are analytically inferred from spatial configuration and established urban climate theory, rather than derived from direct empirical measurement or simulation. This distinction is introduced early to clarify the interpretive scope and methodological positioning of the research. Rather than treating heritage form as a static artifact, the paper approaches it as an operational system in which compactness, enclosure, continuity, and sequencing work together in ways associated with reduced radiant heat exposure, sustained shaded movement, and the formation of comfort gradients across public space networks.

This interpretive shift aligns with recent studies of heritage districts in the Gulf region, where urban regeneration, identity formation, and environmental performance are increasingly examined through systemic and relational frameworks rather than object-based preservation (Awad et al., 2022; Boussaa et al., 2023). Contemporary discourse also highlights the role of heritage in mediating global and local dynamics through adaptive reuse, branding, and urban transformation processes, emphasizing the need to understand historic fabrics as evolving systems embedded within broader socio-environmental contexts (Boussaa et al., 2023). In parallel, sustainability-oriented urban frameworks in Saudi Arabia underscore the necessity of integrating low-carbon and climate-responsive strategies at the district scale, reinforcing the relevance of morphology-based approaches to resilience and urban performance (Imam and Hegazy, 2025).

AlUla Old Town, located in north-western Saudi Arabia, provides a particularly compelling context for examining this proposition. The settlement evolved under extreme climatic conditions and resource constraints, resulting in a highly coherent pedestrian-oriented fabric composed of dense block clusters, deeply enclosed lanes, and a fine-grained hierarchy of circulation spaces (Abid et al., 2025). Crucially, AlUla Old Town retains sufficient morphological continuity to allow interpretation at the district scale, enabling analysis of how climatic performance is produced cumulatively through the repetition and interaction of spatial elements (Metallaoui and Dali, 2024). The Old Town is therefore examined not as an isolated heritage ensemble or archaeological remnant, but as an integrated urban system in which environmental adaptation is spatially encoded.

Despite growing scholarly interest in climate-responsive urbanism and heritage conservation, the relationship between historic urban morphology and contemporary resilience frameworks remains insufficiently articulated. Heritage research has tended to emphasize documentation, typology, and material authenticity, often without translating spatial logic into environmental performance terms (Haldrup and Bœrenholdt, 2015; Kidd, 2011). At the same time, urban climate and resilience studies have frequently prioritized quantitative modeling and localized interventions, with limited attention to the structural intelligence embedded in historic street networks and block configurations (Chen et al., 2025). What remains underdeveloped is a structured analytical pathway that links observed heritage morphology to explicit climatic mechanisms and, ultimately, to actionable resilience principles applicable to present-day urban design and policy.

In response to this gap, the present study investigates how the urban morphology of AlUla Old Town operates as climate intelligence in a hot-arid environment and how this intelligence can be systematically translated into transferable design knowledge. The research is guided by three core aims: to conduct a qualitative–analytical reading of AlUla Old Town at the district scale; to identify and interpret the climatic mechanisms embedded in its spatial structure; and to extract a set of heritage-derived principles that inform contemporary urban resilience strategies without detaching them from their spatial and cultural grounding.

In operational terms, the study addresses the following guiding questions: How does the district-scale morphology of AlUla Old Town regulate thermal exposure and pedestrian comfort through spatial configuration? Which recurring form climate relationships can be analytically identified across the urban fabric? How can these relationships be abstracted into transferable principles without reducing heritage to stylistic replication? These questions structure the analytical progression from observation to synthesis and translation.

The contribution of this research is threefold. Conceptually, it reframes urban heritage as an active environmental system rather than a passive cultural reference. Methodologically, it indicates how urban morphology can be operationalized as a tool for climatic interpretation through transparent qualitative analysis, supported by a structured analytical codebook. Practically, it delivers a resilience framework that translates heritage-based spatial intelligence into guidance for pedestrian-oriented urban design and policy in hot-arid contexts.

2 Conceptual framework

The conceptual grounding of this study rests on the premise that urban form is not a neutral container for social and environmental processes, but an active mediator of climatic experience (Figure 1). In hot-arid environments, where solar radiation, heat accumulation, and thermal stress dominate everyday urban life, the configuration of streets, blocks, and interfaces plays a decisive role in shaping how climate is encountered, moderated, and negotiated at the pedestrian scale (Ramadan, 2010). Rather than relying on technological mediation, traditional urban settlements in such contexts evolved spatial systems that embedded environmental regulation directly within the structure of the urban fabric.

FIGURE 1

Within this framework, urban heritage is approached as climate intelligence, understood as the cumulative spatial knowledge encoded in historic urban morphology that enables climatic adaptation through form, continuity, and sequence. The term climate intelligence is used here as a conceptual synthesis that extends, rather than replaces, established frameworks such as bioclimatic design and climate-responsive urbanism. While these approaches often focus on optimizing environmental performance at the building or object scale, climate intelligence emphasizes the relational and fabric-scale organization of urban form through which environmental regulation emerges cumulatively. The distinction is therefore not terminological but structural and scalar, positioning climate intelligence as a framework concerned with how spatial systems, rather than isolated interventions, mediate climatic experience.

This intelligence does not reside in individual buildings or isolated design features but emerges from the relational logic of the urban system as a whole. Compact block arrangements reduce exposed surface area and promote mutual shading, while narrow and enclosed circulation paths limit solar penetration and moderate radiant heat gain (Sanaieian et al., 2014; Savvides and Vassiliades, 2017). When repeated consistently across a district, these spatial patterns are associated with microclimatic effects documented in urban climate literature.

Urban morphology thus operates as an environmental performance system at the district scale, where climatic outcomes arise from the interaction between multiple spatial elements rather than from single interventions (Golany, 1996). The performance of a shaded lane, for example, is inseparable from its position within a larger network of routes, nodes, and thresholds that collectively support shaded continuity and allow pedestrians to move through the city with limited thermal disruption. This systemic perspective aligns with morphological theories that emphasize urban form as an integrated spatial structure shaped by rules of aggregation, hierarchy, and continuity rather than by isolated architectural objects (Kropf, 2018; Marcus and Colding, 2014).

Within hot-arid cities, the environmental significance of morphology becomes particularly evident in the relationship between walkability and microclimate. Pedestrian movement in extreme climates is not simply a function of distance or connectivity, but of thermal tolerance and comfort over time (Vasilikou and Nikolopoulou, 2020). Traditional urban fabrics demonstrate how spatial sequencing from exposed edges to progressively enclosed passages creates comfort gradients that allow the human body to adapt gradually to thermal conditions. These gradients are reinforced by micro-nodes and widened pockets that provide pause points, social interaction spaces, and localized thermal relief, further integrating environmental moderation with everyday urban life.

The conceptual model adopted in this study therefore treats walkability not as a mobility metric alone, but as an outcome of climatic regulation achieved through spatial form. In this sense, resilience is understood as the capacity of the urban fabric to support pedestrian activity, social interaction, and functional continuity under climatic stress, without excessive reliance on energy-intensive systems (Abuwaer et al., 2023; Parihar and Birman, 2024). This interpretation shifts resilience from an abstract policy goal to a spatially observable condition that can be read directly from the organization of streets, blocks, and interfaces.

A critical component of this framework is the notion of transferability, which addresses how place-specific heritage knowledge can inform contemporary urban design without being reduced to stylistic imitation. Transferability is not achieved by copying forms, but by abstracting principles of spatial performance such as compactness, enclosure, hierarchy, and continuity that can be reinterpreted within different cultural, regulatory, and technological contexts (Krokfors, 2017). This requires a careful analytical process that distinguishes between culturally embedded expressions of form and the underlying climatic mechanisms they enable.

By situating AlUla Old Town within this conceptual framework, the study establishes a structured pathway from heritage evidence to resilience knowledge, ensuring that subsequent analysis is grounded in both spatial observation and environmental interpretation. The framework also provides the basis for the analytical codebook and principal extraction presented later in the study, enabling transparency, rigor, and replicability.

3 Case study and study area definition

AlUla Old Town is situated within a hot-arid climatic zone characterized by high solar radiation, extreme summer temperatures, and pronounced diurnal thermal variation (Gilento et al., 2024). These environmental conditions have historically imposed significant constraints on outdoor activity, material durability, and settlement organization. In response, the urban form of AlUla evolved as a compact, pedestrian-oriented fabric in which spatial configuration played a central role in mitigating climatic stress and enabling everyday life. The settlement’s morphology reflects a long-term process of environmental adaptation, where urban space was shaped not only by social and economic considerations but also by the imperative to regulate heat exposure and maintain habitable microclimates.

The Old Town is understood in this study as a coherent urban system, rather than a collection of isolated heritage structures. Its spatial structure is defined by dense block aggregation, narrow and deeply enclosed circulation paths, and a finely articulated hierarchy of streets and passages (Seiseh et al., 2024). These elements operate collectively to limit solar penetration, support shaded movement, and create gradual transitions between exposed and protected spaces. Such characteristics make AlUla Old Town particularly suitable for investigating how climate intelligence is embedded within urban morphology at the district scale.

AlUla Old Town is treated here as a revelatory morphological case rather than a statistically representative sample of all hot-arid settlements. Despite its growing prominence within heritage and development discourse, the traditional urban fabric of AlUla remains underexamined in systematic morphological and climate-responsive research. This study therefore addresses a critical gap by providing a structured analytical reading of the settlement at the district scale, contributing to both regional scholarship and the broader discourse on hot-arid urbanism. The clarity of the defined study boundary further supports analytical precision by isolating the morphologically coherent core, ensuring that the observed spatial relationships are not diluted by peripheral fragmentation. Its relative spatial continuity and limited modern fragmentation allow district-scale climatic logic to remain legible, making it analytically suitable for exposing relational form–climate mechanisms. The aim is not to generalize empirically across all arid contexts, but to extract structurally coherent principles whose applicability must be evaluated and calibrated in other settings.

The analytical boundary adopted in this research delineates the continuous historic fabric of AlUla Old Town, capturing the area in which compact block structure and pedestrian circulation networks remain legible and functionally interconnected. The boundary is intentionally drawn to exclude peripheral or fragmented areas where modern interventions have disrupted morphological continuity, as such areas would weaken the interpretability of district-scale climatic mechanisms. By focusing on a spatially intact core, the study ensures that observed environmental effects such as shading continuity, enclosure, and thermal buffering can be attributed to the internal logic of the urban fabric rather than to isolated conditions or external influences (Figure 2).

FIGURE 2

This boundary definition serves a critical methodological purpose. It establishes the Old Town as the unit of climatic interpretation, allowing urban morphology to be read as a system whose performance emerges cumulatively through repetition and spatial interaction. The boundary also provides a transparent basis for replicability, enabling other researchers to apply a similar approach to historic fabrics in comparable climatic contexts.

Within this defined boundary, the analysis focuses on four interrelated urban components: street segments, nodes, blocks, and interfaces. Street segments include all pedestrian lanes and passages, differentiated by relative width, enclosure, and position within the circulation hierarchy. Nodes are identified as intersections, widenings, or micro-pockets that interrupt linear movement and provide spatial and climatic relief. Blocks are understood as compact urban cells formed through the aggregation of built mass, while interfaces refer to threshold conditions between public, semi-public, and private realms, including entrances and transitional pockets.

The selection of these components reflects the study’s emphasis on spatial performance rather than architectural detailing (Table 1). Elements such as construction techniques, material properties, or indoor thermal behavior are not examined in depth unless they directly influence the configuration of the urban fabric. This analytical scope allows the research to remain focused on how climatic intelligence is expressed through spatial relationships, continuity, and sequencing at the urban scale.

This structured definition of the study area and analytical scope ensures that subsequent interpretation remains tightly aligned with the conceptual framework of urban heritage as climate intelligence. It also establishes the foundation for the methodological procedures applied in the following section, where spatial data sources, analytical coding, and interpretive steps are described in detail.

4 Methodology

This study adopts a qualitative–analytical research design grounded in urban morphology and environmental interpretation. The methodological approach is intentionally non-simulative, focusing on spatial configuration, relational logic, and cumulative environmental performance as expressed through the urban fabric. This choice reflects the study’s objective to interpret climate intelligence as embedded within historic urban form rather than as a product of predictive thermal modeling or building-level performance metrics (Lin et al., 2026; Yu et al., 2025).

Urban morphology is treated as an operational system in which climatic regulation emerges through the interaction of spatial elements at the district scale. Accordingly, the research design prioritizes form-based analysis, repetition of spatial patterns, and relational interpretation over isolated measurement or object-level evaluation.

This study adopts an interpretive morphological epistemology grounded in established urban climate theories, particularly those related to urban heat island dynamics, street canyon microclimates, and sky-view factor analysis, rather than predictive simulation modeling. The objective is to identify spatial configurations that align with known climatic mechanisms documented in urban heat, canyon, and sky-view factor research, and to examine how these configurations operate relationally at district scale. The analysis therefore establishes structural plausibility and environmental alignment rather than calibrated thermal measurement. This distinction is critical: the contribution lies in revealing how climatic logic is embedded in spatial organization, not in quantifying performance differentials under specific meteorological conditions.

4.1 Study boundary and unit of analysis

The analysis is conducted within the delineated boundary of AlUla Old Town, defined as a continuous historic fabric characterized by compact block morphology and a predominantly pedestrian circulation network. The boundary is drawn to capture spatial continuity and morphological integrity, ensuring that observed climatic mechanisms such as shading continuity, enclosure, and buffering can be interpreted as systemic rather than incidental.

This decomposition allows climatic intelligence to be examined across multiple spatial scales while maintaining a district-level perspective.

4.2 Data sources

The study draws on three primary categories of data. Base spatial data include satellite imagery and available mapping resources used to digitize the street network, block structure, and study boundary. Visual documentation, including archival and field photographs where available, supports qualitative interpretation of enclosure, shading persistence, and spatial sequencing (Chen et al., 2024). Secondary sources, such as heritage documentation, planning reports, and scholarly literature, are used to contextualize observed spatial patterns and substantiate interpretive claims where necessary (Kerr, 2022). These data sources are integrated to support triangulation between mapped form, experiential evidence, and established environmental knowledge.

4.3 Analytical framework and coding scheme

The analytical framework operationalizes urban morphology as climate intelligence through a structured codebook linking morphological features to climatic mechanisms and urban resilience outcomes (Table 2). Each spatial unit within the study boundary is examined using form-based attributes such as enclosure, continuity, hierarchy, connectivity, and spatial sequencing.

To enhance procedural transparency and enable methodological replicability, enclosure ratios were assessed through scaled digital mapping of street widths relative to adjacent built mass heights using satellite imagery and plan-based approximations. While precise dimensional surveys were not undertaken, proportional relationships between street width and vertical enclosure were estimated consistently across the study boundary to identify relative variation rather than absolute metrics. Street hierarchy was determined through connectivity density, spatial continuity, and positional centrality within the network using plan-based mapping. Repetition-based pattern recognition was conducted through iterative cross-reading of mapped segments to identify recurring form–climate relationships. All coding decisions were recorded in a structured matrix to ensure internal consistency across spatial units.

For example, compact block morphology is interpreted in terms of mutual shading and reduced solar exposure, contributing to district-scale thermal buffering. Narrow street sections are examined through perceived enclosure and reduced sky-view factor, supporting persistent shade and pedestrian thermal comfort. Nodes and thresholds are coded in relation to their role in creating comfort gradients and regulating transitions between microclimates.

4.4 Analytical procedure

The analytical procedure follows a sequential workflow that moves from spatial documentation to interpretive synthesis. Urban morphology is first mapped and decomposed into discrete spatial units within the defined boundary. Street-network hierarchy is identified, and compact block clusters are delineated. Nodes and interfaces are mapped as points or small polygons corresponding to spatial interruptions or transitions.

Each spatial unit is then coded using the analytical framework, and recurring relationships between form and climatic behavior are identified across the district. These relationships are interpreted in terms of pedestrian comfort, shading continuity, and microclimate moderation, forming the evidentiary basis for principal extraction (Figure 3). These theoretical foundations provide a basis for interpreting how spatial configurations influence solar exposure, radiant heat exchange, and pedestrian-level thermal conditions at the district scale.

FIGURE 3

4.5 Principal extraction and synthesis

Following coding and interpretation, recurring form–climate relationships are distilled into a set of heritage-derived climate intelligence principles. Each principle is articulated in statement form and supported by evidence from AlUla Old Town, its associated climatic logic, and its relevance for contemporary urban design. This step represents the primary knowledge-generating phase of the study, moving beyond description toward conceptual and practical contribution.

4.6 Trustworthiness and limitations

To enhance analytical credibility, the study employs triangulation across spatial mapping, photographic evidence, and literature-based environmental interpretation. Although the methodology does not rely on quantitative simulation, rigor is maintained through systematic coding, repetition-based pattern recognition, and explicit boundary definition.

Limitations include the qualitative nature of climatic interpretation and the focus on outdoor and transitional spaces rather than interior thermal performance. The study does not incorporate microclimatic field measurements, thermal sensor data, or computational simulation models. As such, the climatic mechanisms identified are analytically inferred from established environmental theory and morphological observation rather than empirically quantified performance metrics. While this approach enables conceptual clarity and fabric-scale interpretation, it does not allow predictive validation under varying seasonal or future climatic scenarios. Additionally, enclosure assessment and pattern recognition rely on systematic qualitative interpretation, which may introduce a degree of analytical subjectivity despite the structured coding framework. Finally, contemporary urban conditions including altered densities, infrastructural systems, and mobility patterns differ from those of historic settlements, which may influence the direct transferability of morphological principles without contextual recalibration. These limitations are acknowledged explicitly and aligned with the study’s stated scope and objectives.

5 Results: AlUla old town morphology as climate intelligence

The urban morphology of AlUla Old Town reveals a coherent system of climate intelligence in which environmental performance emerges through the interaction of spatial elements across the district. Rather than operating as isolated attributes, compact blocks, hierarchical circulation networks, enclosed lanes, controlled permeability, nodes, and thresholds function as interdependent components whose climatic effects are amplified through repetition, continuity, and spatial sequencing. Together, these elements regulate solar exposure, support shaded pedestrian movement, and moderate microclimatic conditions at the scale of everyday urban experience (Figure 4).

FIGURE 4

Spatial evidence indicates that climatic resilience in AlUla Old Town is not achieved through singular design responses, but through a fabric logic in which form-based rules are consistently applied across the settlement. Each of these observations corresponds directly to coded relationships defined in the analytical codebook (Table 2), ensuring traceability between morphological features, inferred climatic mechanisms, and identified resilience outcomes. This spatial evidence is derived from a combination of mapped urban morphology, visual documentation of enclosure and shading conditions, and systematic coding of recurring form–climate relationships using the analytical codebook. Observations include the continuity of shaded street segments, the density and configuration of compact blocks, and the distribution of nodes and thresholds across the fabric, all of which collectively support the interpretive assessment of climatic performance.

Compactness is associated with reduced exposure and contributes to thermal buffering, hierarchical streets organize protected movement, enclosure supports shading persistence, permeability is filtered rather than maximized, and nodes and thresholds introduce comfort gradients and adaptive transitions. These relationships are associated with resilience outcomes such as walkability continuity, pedestrian thermal comfort, and microclimate moderation, grounding environmental performance in urban structure rather than technological intervention. Image-based evidence is used strategically to anchor these interpretations in observable spatial conditions, ensuring that climatic mechanisms are legible through mapped form, section logic, and human-scale experience rather than inferred abstractly. This evidentiary foundation enables the articulation of heritage-derived climate intelligence as a system-level property of the urban fabric, understood here as a spatial-environmental system in which morphological configuration, pedestrian movement, and microclimatic regulation operate in an integrated and interdependent manner.

5.1 Compact block morphology and reduced exposure

The compact block morphology of AlUla Old Town operates as a district-scale environmental regulator in which thermal moderation is achieved through spatial aggregation rather than technological intervention. Dense clustering of built mass minimizes exposed surface area and suppresses solar penetration into the interior of the fabric, producing an urban condition where radiant heat gain is distributed and attenuated across contiguous block edges (Figure 5). This configuration is consistent with reduced localized heat accumulation while stabilizing ambient conditions within the pedestrian network (Xiong and He, 2024; Colaninno et al., 2025).

FIGURE 5

Crucially, the environmental performance of compactness is cumulative rather than additive. Individual blocks do not function as autonomous thermal units; instead, they participate in a larger morphological field in which repeated adjacency and edge continuity are associated with collective buffering effects. As compact clusters are reiterated across the settlement, microclimatic moderation becomes spatially pervasive rather than episodic, supporting extended outdoor usability even under extreme thermal conditions. This explains why thermal comfort in AlUla Old Town cannot be attributed to isolated “cool” streets or pockets but must be understood as a property of the fabric as a whole.

The coherence of block edges further reinforces this condition by supporting shade continuity along circulation routes and preventing abrupt exposure transitions that would otherwise undermine pedestrian comfort (Kolaxidis et al., 2025). In this sense, compactness functions as an infrastructural logic rather than a formal attribute, embedding thermal regulation directly into the organization of urban space. Walkability and microclimate moderation thus emerge as systemic outcomes of fabric coherence, not as secondary benefits.

5.2 Street-network hierarchy and protected pedestrian continuity

The hierarchical organization of AlUla Old Town’s street network reveals a sophisticated climatic logic in which pedestrian movement is structured around differentiated exposure rather than simple connectivity. Primary spines establish orientation and continuity at the district level, while secondary and tertiary passages form an intricate lattice of alternative routes characterized by greater enclosure and supporting shading (Figure 6). This hierarchy redistributes pedestrian flows into spatial channels that prioritize climatic protection without sacrificing accessibility (Alnaim, 2020).

FIGURE 6

Environmental performance is enhanced through the capacity of the network to assemble shaded segments into extended sequences of protected movement. Rather than relying on singular shaded elements, the fabric enables pedestrians to navigate through chains of thermally moderated spaces, reducing cumulative heat stress over distance. The availability of parallel routes with varying exposure profiles introduces adaptability into everyday movement, allowing route choice to respond dynamically to sun angle, time of day, and seasonal conditions.

This logic reframes walkability as a climatic phenomenon rather than a purely spatial or functional one. Pedestrian continuity is supported not because destinations are close, but because the network supports tolerable thermal conditions along the journey. In this context, spatial and thermal redundancy within the street hierarchy operates as a resilience mechanism, ensuring that multiple alternative routes provide varying degrees of enclosure and shading, thereby maintaining pedestrian continuity under fluctuating environmental conditions.

5.3 Enclosure and “urban canyon” logic of narrow lanes

Enclosure constitutes one of the most pervasive and environmentally consequential characteristics of the Old Town fabric. Narrow lanes and high enclosure ratios are associated with urban canyon conditions that restrict sky exposure, limit direct solar radiation, and reduce radiant heat exchange at pedestrian level (Oke, 1988; Paolini et al., 2014). These effects are intensified by the continuity of enclosure across successive segments, transforming individual lanes into components of a larger climatic system.

The significance of enclosure lies not in its sectional geometry alone, but in its sequencing. As pedestrians move through the network, enclosed spaces are experienced as a continuous gradient rather than as isolated shelters. This sequential protection allows for gradual thermal adaptation, reducing physiological stress associated with abrupt exposure changes and enabling longer durations of outdoor movement. Comfort, in this sense, is supported temporally as much as spatially.

Enclosure thus operates as a relational mechanism that links form, movement, and climate into a coherent experiential system. Its repetition across the fabric amplifies microclimatic stability and reinforces the interpretation of AlUla Old Town as an environment where climatic intelligence is embedded in spatial continuity rather than localized form (Figures 7A,B).

FIGURE 7

5.4 Network permeability versus climatic protection

Although enclosure and compactness dominate the Old Town fabric, climatic performance is not achieved through isolation or closure. Instead, permeability is carefully regulated through spatial filtering that balances access, airflow, and protection from solar exposure. Selective openings, staggered connections, and sequenced transitions allow movement and ventilation to occur without compromising shade continuity or enclosure integrity (Alnaim, 2022).

This calibrated permeability enables the fabric to remain adaptable and socially functional while maintaining environmental control. Movement from more exposed connectors into protected passages is rarely abrupt; it is mediated through intermediate conditions that preserve comfort and facilitate thermal adjustment. Such regulation prevents both overexposure and stagnation, demonstrating an understanding of environmental balance embedded within the spatial logic of the settlement (Dehalwar and Sharma, 2026).

Permeability is therefore understood as an environmental tuning mechanism rather than a binary condition (Table 3). Its effectiveness lies in its spatial modulation, reinforcing the interpretation of AlUla Old Town as an adaptive system capable of negotiating climatic extremes through form-based intelligence.

5.5 Nodes, micro-pockets, and pause spaces

Nodes and micro-pockets introduce a secondary layer of climatic modulation by punctuating linear movement with localized relief spaces. These small widenings and intersections function as micro-scale regulators that allow pedestrians to pause, rest, and reorient within a thermally moderated setting (Alnaim, 2021). Their modest scale ensures that enclosure and shading continuity are largely preserved, preventing the creation of exposed voids that would undermine pedestrian comfort.

The environmental value of nodes lies in their distribution and integration within the network. Rather than concentrating relief in singular plazas, the fabric disperses micro-pockets along primary and secondary routes, creating a rhythm of movement and rest that extends the usability of pedestrian networks under thermal stress. These spaces also support social interaction, reinforcing the interdependence of climatic performance and everyday urban life.

Nodes thus function as spatial mediators between movement and inhabitation, enhancing resilience by enabling endurance rather than speed. They represent a form of environmental redundancy at the micro-scale, complementing the redundancy embedded within the street hierarchy (Figure 8).

FIGURE 8

5.6 Thresholds and edge conditions

Thresholds and edge conditions articulate the interface between public circulation spaces and semi-private or private domains through layered spatial transitions. Recessed entrances, intermediary pockets, and controlled openings soften climatic contrasts by moderating the shift between outdoor exposure and enclosed interiors (Alnaim and Noaime, 2024). These transitions reduce thermal shock and support gradual adaptation, reinforcing comfort at the scale of everyday routines (Figure 9).

FIGURE 9

Edge continuity remains a defining feature of the fabric, preserving shade persistence and enclosure along movement routes while allowing permeability to be selectively introduced. This balance supports microclimatic stability across the district and prevents fragmentation of the environmental system. Thresholds thus operate simultaneously as climatic buffers and social mediators, integrating environmental regulation with patterns of use and access.

The consistency of these conditions across the Old Town reinforces the interpretation of climate intelligence as a relational property of the fabric. Environmental performance is not confined to streets alone but extends into the interfaces that structure the relationship between movement, dwelling, and climate.

Taken together, the evidence indicates that AlUla Old Town embodies a form of climate intelligence in which resilience emerges through the cumulative interaction of compactness, hierarchy, enclosure, permeability, nodes, and thresholds. Environmental performance is not the result of isolated spatial solutions, but of a coherent morphological system whose intelligence lies in repetition, sequencing, and relational balance. This system-level understanding provides the analytical foundation for extracting a set of heritage-derived principles capable of informing contemporary urban resilience strategies.

5.7 Synthesis: extraction of heritage-derived climate intelligence principles

The morphological evidence documented across AlUla Old Town converges toward a consistent interpretation: climatic performance is not embedded in singular spatial features, but in the relational logic that governs how those features are assembled, repeated, and sequenced across the urban fabric. Compact blocks, hierarchical circulation, enclosure, controlled permeability, nodes, and thresholds do not operate independently; they form an interlocking system in which environmental moderation is supported cumulatively through spatial coherence. This synthesis step translates that system-level intelligence into an explicit set of principles capable of informing contemporary urban resilience discourse.

Principle extraction proceeds by identifying recurring form–climate relationships that appear across multiple spatial conditions and scales, from individual lanes to district-wide movement networks. Rather than abstracting form from context, the synthesis isolates mechanisms of performance such as mutual shading, continuity of protection, gradual thermal transition, and adaptive redundancy that consistently mediate pedestrian comfort and microclimate stability. These mechanisms form the conceptual bridge between observed morphology and transferable design intelligence.

Similarly, the hierarchical organization of the street network indicates that walkability under extreme climatic conditions is a product of protected continuity, not mere connectivity. Movement is supported through sequences of spatially moderated routes that offer alternative paths and exposure profiles, allowing pedestrians to adapt to fluctuating thermal conditions. Redundancy within the network is therefore not inefficient, but environmentally strategic, enhancing resilience by preserving mobility choice under stress.

Enclosure and urban canyon effects further reinforce this logic by stabilizing microclimatic conditions along pedestrian routes. The synthesis reveals that enclosure functions most effectively when experienced sequentially, producing comfort gradients that reduce thermal shock and support physiological adaptation. This insight shifts attention away from optimizing individual street sections toward designing continuous spatial experiences that moderate climate over the course of movement.

Controlled permeability, nodes, and thresholds introduce a second-order layer of climatic intelligence. Filtered access points, pause spaces, and transitional interfaces regulate airflow, exposure, and adaptation without compromising enclosure or shade continuity. These elements extend resilience beyond movement efficiency, integrating rest, social interaction, and gradual environmental transition into the climatic logic of the fabric. Their distributed presence confirms that resilience in AlUla Old Town is achieved through fine-grained modulation, not through large, centralized interventions.

From this synthesis, a set of heritage-derived climate intelligence principles is extracted, each grounded in observed spatial conditions and articulated in a form suitable for translation into contemporary urban design and policy. These principles do not prescribe forms to be replicated, but define rules of spatial performance how compactness, hierarchy, enclosure, continuity, and sequencing can be recomposed to achieve climatic resilience in other hot-arid contexts.

Table 4 consolidates these principles by presenting them in statement form, supported by empirical evidence from AlUla Old Town, their underlying climatic logic, and their relevance for contemporary application. The table functions as a hinge between analysis and translation, converting morphological intelligence into an explicit knowledge set that can inform design decisions, planning controls, and resilience frameworks without detaching principles from their environmental grounding.

This synthesis confirms that the value of AlUla Old Town lies not in its formal uniqueness, but in the transferable intelligence embedded within its urban structure. By making this intelligence explicit, the study establishes a foundation for translating heritage-derived knowledge into contemporary resilience strategies, developed further in the following section.

6 Translation: a heritage-derived resilience framework for hot-arid urbanism

The principles extracted from AlUla Old Town are translated here into a resilience framework that links heritage-derived spatial intelligence to contemporary urban design and policy action. Translation is understood not as replication of historic form, but as the rearticulation of performance logics how spatial configurations regulate climate, movement, and comfort into actionable guidance suitable for present-day urban contexts. The framework operates across multiple scales, aligning morphological inputs with climatic mechanisms, resilience outcomes, and implementation pathways that can be calibrated to local governance, design standards, and development processes (Figure 10).

FIGURE 10

At the core of this translation is the recognition that climatic resilience in hot-arid cities is most effectively achieved at the fabric scale. Building-level solutions may enhance interior comfort, but they rarely support outdoor usability or pedestrian continuity. By contrast, the AlUla-derived principles demonstrate how compactness, enclosure, hierarchy, and sequencing operate together to moderate thermal exposure across districts, enabling resilient everyday urban life without dependence on energy-intensive systems (Gandreau et al., 2022).

6.1 Translation logic: from AlUla-specific evidence to transferable principles

Translation proceeds by isolating mechanisms of performance rather than formal attributes. Compactness, for example, is not transferred as a prescribed density metric, but as a rule of exposure reduction through aggregation. Similarly, narrow lanes are not replicated dimensionally; instead, enclosure is translated as a targeted sky-view reduction strategy appropriate to local climatic and regulatory conditions (Xu et al., 2024).

This approach preserves context-specific environmental logic while enabling adaptability. It allows the framework to inform diverse urban situations new districts, regeneration areas, heritage buffers, and pedestrian networks without collapsing heritage intelligence into stylistic mimicry.

6.2 Framework structure and operational tiers

This tiered structure clarifies causality, enabling planners and designers to trace how spatial decisions translate into environmental performance and resilience benefits.

6.3 Design guidance for contemporary districts

These guidelines emphasize system performance over isolated interventions, reinforcing the importance of fabric coherence in hot-arid resilience strategies.

6.4 Policy integration pathways

While the framework is intended to be transferable, its application is bounded by climatic, cultural, and governance conditions. The principles are most effective in hot-arid or hot-dry climates where solar exposure and radiant heat dominate outdoor comfort challenges (Zahra, 2025; Iqbal, 2018). Cultural patterns of pedestrian use, governance capacity to enforce fabric-scale controls, and the availability of compact development models also influence effectiveness. Explicit recognition of these boundaries ensures responsible application without decontextualization.

Implementation of fabric-scale climatic strategies requires alignment with contemporary regulatory frameworks. Street-width standards, fire access requirements, vehicular circulation norms, and plot subdivision regulations may constrain enclosure ratios or compact aggregation in new developments. Therefore, translation of heritage-derived principles necessitates calibrated regulatory adaptation rather than literal replication. Institutional coordination between planning authorities, transport agencies, and development control bodies is essential to operationalize morphology-based resilience at district scale.

7 Discussion

The findings from AlUla Old Town prompt a recalibration of how climatic resilience is conceptualized in hot-arid urban contexts. Rather than positioning resilience as the outcome of technological optimization or isolated environmental devices, the analysis indicates that resilience can be structured directly into the urban fabric (Table 6). Compactness, enclosure, hierarchical circulation, calibrated permeability, nodes, and thresholds operate collectively to form a microclimatic system associated with moderated solar exposure and stabilized pedestrian conditions (Roesler, 2025). Environmental performance is therefore not appended to urban form but structured through its internal organization. This repositioning shift resilience from a supplemental objective to a structural property of spatial configuration.

A central insight concerns the scale at which climatic performance is produced. Contemporary climate-responsive strategies frequently prioritize the building as the primary unit of intervention, relying on envelope optimization or mechanical systems to mitigate environmental inefficiencies (Peker, 2016; Sharma, 2022). The AlUla case indicates that durable microclimatic stability appears more likely when environmental regulation is distributed across the district through coherent morphological rules. In this configuration, resilience is generated through spatial continuity, repetition, and enclosure at fabric scale.

To clarify the theoretical implications of this shift in scale, it is useful to contrast the morphological intelligence observed in AlUla Old Town with dominant techno-centric models of climate-responsive urbanism. Contemporary resilience strategies frequently prioritize building-envelope optimization, mechanical cooling enhancement, or localized shading interventions. While these approaches improve interior performance, they often operate independently of fabric-scale spatial coherence. By contrast, the AlUla case indicates how climatic regulation can be embedded structurally within the organization of streets, blocks, and interfaces.

The comparison underscores a critical distinction. Techno-centric approaches tend to compensate for climatically inefficient spatial arrangements, whereas morphology-based intelligence is oriented toward preventing excessive exposure through structural configuration. In hot-arid environments characterized by extreme solar radiation, preventative spatial logic offers a more durable foundation for resilience than corrective technological layering alone. This does not suggest abandoning innovation, but rather re-centering urban design discourse on the fabric-scale conditions that determine whether technological systems operate efficiently or redundantly.

In contrast, many contemporary hot-arid urban extensions in the region are characterized by wide vehicular corridors, detached plot structures, fragmented frontage conditions, and discontinuous shading environments. Such configurations often require mechanical or additive shading solutions to compensate for high sky-view exposure and radiant heat accumulation. This morphological contrast underscores that the difference between historic and modern districts lies not merely in material technology, but in the structural organization of spatial exposure.

The analysis reframes walkability in hot-arid cities as a climatic condition rather than solely a mobility metric. Conventional assessments emphasize connectivity and proximity, often treating thermal comfort as secondary (Almajadiah, 2023; Alawadi et al., 2022; Shoghi et al., 2025). In contrast, the AlUla fabric indicates that pedestrian continuity depends fundamentally on exposure regulation. Hierarchical networks, shaded sequencing, and enclosure gradients support movement by maintaining tolerable thermal conditions over time. Walkability, therefore, is achieved through climatic moderation embedded within spatial structure.

The findings reposition heritage within contemporary resilience discourse. Rather than functioning solely as a domain of preservation or symbolic identity, heritage urban fabrics can operate as repositories of environmental knowledge (Moneta et al., 2025). When interpreted analytically rather than stylistically, historic settlements reveal adaptive spatial mechanisms that remain relevant under intensified climatic pressures. These reframing shifts heritage from a cultural constraint to a strategic environmental resource.

Within the Saudi Arabian context, this repositioning aligns with a rapidly evolving heritage discourse that extends beyond preservation toward adaptive reuse, cultural tourism, and identity-driven urban regeneration. Recent studies highlight how historic environments are being actively reintegrated into development agendas through initiatives that balance conservation with socio-economic activation, particularly in projects such as Al-Diriyah, Historic Jeddah, and regional heritage markets (Mazzetto, 2022; Noaime et al., 2022; Aloshan et al., 2024). This shift reflects a broader process of heritagization and reinterpretation, where traditional urban forms are mobilized as instruments of cultural continuity and contemporary urban identity rather than static artifacts (Chaudhry, 2025; Hanif and Riza, 2024; Alnaim and Alnaim, 2026). In this context, the present study contributes by extending this discourse toward environmental performance, demonstrating how heritage urban morphology can operate not only as a cultural and economic resource, but also as a spatial framework for climate-responsive urban resilience.

This perspective is further supported by national policy directions such as the Saudi Architectural Identity Charter, which emphasizes the integration of local architectural principles into contemporary development. While the Charter primarily addresses visual and cultural coherence, the findings of this study suggest that its principles can be expanded to incorporate climate-responsive spatial logic, reinforcing the role of urban morphology in achieving both identity continuity and environmental resilience.

Climatic performance in AlUla Old Town emerges from relational configuration rather than isolated features. Enclosure gains significance through continuity, nodes through distribution, and permeability through calibrated filtering. Resilience is therefore a systemic outcome arising from coordinated spatial decisions. This relational logic underscores the necessity of fabric-scale design thinking in climate adaptation strategies (Sádaba et al., 2025; Lin et al., 2021; Dhar and Khirfan, 2017).

While prior scholarship has examined the relationship between urban morphology and thermal performance (Yang et al., 2021; Guo et al., 2023), this study advances the field by operationalizing district-scale relational logic through a structured analytical codebook that links spatial configuration to climatic mechanisms and resilience outcomes. By translating morphological evidence into a tiered resilience framework, the research extends climate-responsive urbanism beyond descriptive morphology toward actionable fabric-scale governance and design strategy.

The transferability of these principles requires contextual calibration. In this regard, a distinction must be made between context-dependent expressions of morphology and more broadly transferable spatial logics. While specific dimensional attributes, material configurations, and cultural spatial practices remain locally bound, underlying principles such as compactness, enclosure, hierarchical circulation, and sequential shading can be adapted across comparable hot-arid contexts where climatic drivers are similar.

A critical risk in translating heritage-derived principles lies in their reduction to stylistic imitation, where formal elements are replicated without regard to their underlying climatic logic. Such approaches often result in visually referential environments that fail to reproduce the environmental performance embedded in historic fabrics. The findings of this study reinforce that transferability must operate at the level of spatial logic rather than formal expression, ensuring that compactness, enclosure, and sequencing are reinterpreted as performance-driven strategies rather than aesthetic motifs.

Strategies emphasizing enclosure, compactness, and shaded continuity are particularly effective in hot-arid environments dominated by radiant heat exposure. In humid or temperate climates, similar configurations may require adjustment to maintain ventilation and daylight access (Iqbal, 2018). Institutional capacity also influences implementation, as fabric-scale regulation demands governance mechanisms that extend beyond plot-based control. Recognition of these contextual conditions ensures responsible adaptation rather than universal prescription.

Methodological limitations also warrant reflection. The study relies on qualitative–analytical interpretation rather than quantitative simulation, emphasizing interpretive rigor and pattern recognition over numerical validation. While this approach is appropriate for revealing embedded spatial intelligence, it cannot quantify thermal performance with precision or predict future climatic scenarios. The findings therefore establish conceptual and morphological plausibility, not calibrated performance metrics. Future research could complement this approach with microclimatic measurements, thermal walks, or simulation-based validation to test and refine the proposed principles under varying conditions.

Further research directions also include comparative studies across different hot-arid settlements to examine how variations in culture, materiality, and governance influence the expression of climate intelligence. Longitudinal studies could explore how traditional fabrics perform under contemporary climatic intensification, while applied research could test the framework’s translation into new developments or regeneration projects. Such work would strengthen the empirical basis for integrating heritage-derived intelligence into mainstream urban resilience practice.

AlUla Old Town indicates that climatic resilience in hot-arid contexts can be structured through spatial coherence rather than technological compensation. By foregrounding morphology as an environmental instrument, the study contributes to a broader reorientation of climate-responsive urbanism toward fabric-scale design logic. The implications extend beyond heritage preservation, suggesting that future resilience agendas must prioritize how urban districts are spatially composed, not merely how efficiently individual buildings perform.

8 Conclusion

This study reconceptualizes urban heritage in hot-arid environments as an operational form of climate intelligence embedded within spatial structure. Through a district-scale morphological analysis of AlUla Old Town, the research indicates that climatic resilience can be structurally encoded in the configuration of streets, blocks, and interfaces rather than added through technological supplementation. Compact aggregation, hierarchical circulation, persistent enclosure, calibrated permeability, distributed nodes, and layered thresholds collectively form a microclimatic system associated with moderated solar exposure and supports pedestrian continuity.

The findings show that environmental performance in AlUla Old Town is cumulative and relational. Thermal buffering is associated with aggregation and edge coherence; walkability is enabled by shaded route continuity and network redundancy; microclimate stability is supported through sequential enclosure and moderated transitions. These mechanisms reveal resilience as a property of fabric-scale organization, produced through spatial coherence rather than object-level optimization.

By translating these observations into a structured set of heritage-derived climate intelligence principles, the study provides an analytical bridge between morphological evidence and contemporary resilience practice. The proposed four-tier framework linking morphological inputs, climatic mechanisms, resilience outcomes, and policy actions clarifies causal relationships that are often implicit in climate-responsive discourse. This structured translation moves beyond descriptive heritage appreciation and positions urban morphology as an actionable instrument within planning, design governance, and policy regulation.

The research also advances methodological insight by showing how qualitative morphological analysis, supported by systematic coding and spatial interpretation, can yield robust environmental understanding at the fabric scale. While the absence of quantitative simulation limits predictive precision, the approach establishes conceptual clarity and analytical rigor, offering a complementary pathway to dominant techno-centric models of climate adaptation.

The implications of this research extend beyond heritage interpretation toward a broader reorientation of climate-responsive urbanism. As thermal stress intensifies in hot-arid regions, the findings emphasize that resilience must be structured through spatial configuration at the district scale rather than addressed solely through building-level interventions. AlUla Old Town demonstrates that climatic intelligence can be embedded within the relational logic of urban form, offering a transferable foundation for contemporary design and policy. By making this intelligence explicit, the study contributes a framework through which heritage-informed urban morphology can actively support resilient, walkable, and environmentally adaptive urban futures.

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