Publications
Angkor
Severe climate change in the fourteenth century led to catastrophic flooding and drought at Angkor, disrupting its water management system and contributing to the site's decline. This study reveals that mega-monsoons eroded central canals and deposited sand, reducing Greater Angkor's resilience to subsequent droughts—a critical factor in its transformation from a thriving urban complex to an early modern settlement form by the sixteenth century. The research traces Angkor's evolution from two low-density towns (Bhavapura and Hariharalaya) into a multicentric city, with development expanding westward, southward, and northward before stabilizing in the thirteenth century.
Angkor Heritage Tourism and Tourist Perceptions
Tourist perceptions of Angkor are overwhelmingly positive, with visitors reporting experiences that exceed expectations due to cultural enrichment and the friendliness of local people. The study categorizes tourists primarily as cultural visitors, whose motives and experiences are deeply intertwined. While overall satisfaction is high, concerns about environmental pollution, sanitation, local poverty, and language barriers were identified, highlighting gaps in communication and infrastructure. This research, based on a survey using standard questionnaires, provides valuable insights into the factors influencing tourist satisfaction at Angkor, underscoring both its appeal as a cultural destination and the challenges that need addressing to enhance visitor experiences.
Diachronic modeling of the population within the medieval Greater Angkor Region settlement complex
A groundbreaking study estimates that the medieval Greater Angkor Region, one of the world's largest premodern settlement complexes (9th to 15th centuries CE), housed approximately 700,000 to 900,000 inhabitants at its peak in the 13th century. This finding, derived from a novel integration of lidar data, archaeological excavations, radiocarbon dating, and machine learning algorithms, provides the first comprehensive demographic model for Angkor. The research offers a granular, diachronic perspective on population growth within this ancient civilization, with potential applications for studying other historical urban centers.
Provisioning an Early City: Spatial Equilibrium in the Agricultural Economy at Angkor, Cambodia
Agricultural production at Angkor, one of the most extensive preindustrial cities, was organized to support urban growth efficiently. The study reveals that farming labor generated increasing returns through supra-household-level organization, challenging traditional economic anthropology views on decreasing marginal returns. Spatial patterns indicate land-use choices considered transportation costs to the urban core, suggesting a system more akin to modern urban production than smallholder farming. The research leverages extensive documentation of the Greater Angkor Region to analyze these spatial and social dynamics.
The evolution of agro-urbanism: A case study from Angkor, Cambodia
Angkor, Cambodia, stands as the world's most extensive pre-industrial settlement complex, with its low-density metropolitan area and higher-density civic-ceremonial center growing independently at different rates. This study reveals that both state-level policies and infrastructure, alongside bottom-up local organization, drove Angkor's expansion. By employing a unique fine-grained diachronic analysis of the landscape, researchers identified how these factors contributed to the site's evolution over time. The findings suggest that similar patterns may emerge in comparative studies of other agro-urban settlements in Mesoamerica and Asia.
Three-dimensional deformation monitoring and simulations for the preventive conservation of architectural heritage: a case study of the Angkor Wat Temple, Cambodia
Researchers detected subtle structural instabilities at Angkor Wat, with deformation rates up to 3 mm/year, despite the temple's overall stability. These findings highlight the vulnerability of architectural heritage to thermal-induced bending and potential defects from solar radiation. The study introduced an innovative methodology combining differential SAR tomography (D-TomoSAR) and finite element method (FEM) simulations, addressing limitations in traditional geodetic approaches like GNSS and InSAR. By analyzing 46 TerraSAR-X images from 2011–2013, the team demonstrated how integrating InSAR measurements improved deformation simulation accuracy, providing a robust framework for preventive conservation of global heritage sites.
Modeling Virtual Angkor: An Evolutionary Approach to a Single Urban Space
Virtual Angkor demonstrates how advanced computer graphics, combined with historical and scientific research, can create an interactive, high-fidelity digital model of the ancient Cambodian city. This platform integrates artistic, technical, and academic expertise to simulate life in premodern Angkor, addressing challenges like time compression, parameter-driven simulation, and modeling fidelity. By merging feedback loops and collaborative processes, it offers a dynamic tool for education and research, showcasing the potential of interdisciplinary approaches in reconstructing complex urban spaces.
The active microbes and biochemical processes contributing to deterioration of Angkor sandstone monuments under the tropical climate in Cambodia – A review
Recent research highlights the significant role of active microbes and biochemical processes in the deterioration of Angkor's sandstone monuments. The study reveals that both sulfur and nitrogen cycles are actively driven by specific microorganisms, including sulfur-oxidizing bacteria, fungi, and ammonia-oxidizing archaea (AOA), which are more abundant than ammonia-oxidizing bacteria (AOB) on these structures. This shift in research focus from inactive to biochemically functional microbes provides crucial insights for the preservation of cultural heritage. The investigation utilized both culture-dependent and culture-independent techniques to identify the microbiota associated with sandstone, emphasizing the importance of understanding these processes for effective protection and management strategies.
The Khmer did not live by rice alone: Archaeobotanical investigations at Angkor Wat and Ta Prohm
Archaeobotanical research at Angkor Wat and Ta Prohm reveals that the Khmer Empire's non-elite populations relied on a diverse range of plants beyond rice for sustenance, ritual, and medicinal purposes. By analyzing macroremains and phytoliths from residential contexts within temple enclosures—combined with historical inscriptions and Zhou Daguan’s 13th-century accounts—the study reconstructs aspects of daily life in these sacred urban landscapes. Findings indicate that plants cultivated or foraged in these spaces played crucial roles in diet, household economies, and ceremonial practices, challenging the notion that rice was the sole staple. This interdisciplinary approach sheds light on the multifaceted functions of Angkorian temples as hubs of ritual, politics, and subsistence.
Top-down and bottom-up water management: A diachronic model of changing water management strategies at Angkor, Cambodia
Research at Angkor, Cambodia, reveals that the Khmer Empire's water management strategies evolved from decentralized community-led efforts to centralized state-controlled systems. By integrating diverse archaeological datasets and creating diachronic models, scientists traced the emergence of temple communities alongside large-scale hydraulic infrastructure over 1000 km². The findings indicate a shift in power dynamics, with autonomous temple communities being gradually replaced by state-sponsored agricultural units, reflecting the empire's attempt to centralize production during its peak (9th to 15th centuries CE). This transformation underscores the complex interplay between top-down and bottom-up water management in shaping one of history's most sophisticated engineered landscapes.
Visitor Management in World Heritage Destinations before and after Covid-19, Angkor
Visitor management at UNESCO World Heritage Sites, such as Angkor, must now integrate public health goals alongside traditional sustainability objectives. This study reveals that COVID-19 has introduced a new dimension to visitor strategies, requiring collaboration among tourism authorities and health agencies. While pre-pandemic approaches focused on balancing economic, social, and environmental factors, post-COVID-19 management demands proactive risk mitigation. The research employed qualitative methods, including participant observation for pre-COVID-19 data and expert recommendations for post-pandemic strategies, using grounded theory and Atlas.ti software for analysis. Findings highlight potential conflicts between public health measures and other sustainability goals, particularly economic and social objectives, while emphasizing the need to adapt to a 'risk society' paradigm.
Visitors' experience at Angkor Wat, Cambodia: evidence from sentiment and topic analysis
A comprehensive analysis of visitor experiences at Angkor Wat, a UNESCO World Heritage Site and top-rated global landmark, reveals overwhelmingly positive sentiments among travelers. Using big data analytics on 32,394 TripAdvisor reviews from 2015 to 2019, researchers found that themes like sunset/sunrise views, temple structures, guided tours, and immersive experiences correlated with high ratings (four or five stars). Conversely, negative sentiments were tied to crowding, persistent selling, clothing restrictions, and expenses. These insights provide actionable data for site managers to enhance visitor satisfaction through targeted marketing and operational adjustments.
Radar interferometry offers new insights into threats to the Angkor site
A groundbreaking study leverages radar interferometry to uncover critical threats facing the Angkor site, offering new insights that could inform sustainable conservation strategies for other UNESCO World Heritage Sites. By analyzing subtle ground deformations over time, researchers identified patterns of subsidence and structural instability, which are not easily detectable through conventional methods. This approach provides a more precise understanding of environmental and anthropogenic pressures affecting the site, such as groundwater extraction and urban development. The findings underscore the importance of integrating advanced remote sensing techniques into conservation planning to mitigate risks and ensure long-term preservation.
Residential patterning at Angkor Wat
New evidence from Angkor Wat challenges traditional views of temple precincts, revealing that the large rectangular enclosure surrounding the temple was not exclusively reserved for the elite or priestly classes. LiDAR surveys and excavations have uncovered signs of low-density residential occupation, suggesting that these areas may have housed individuals servicing the temple rather than being solely sacred or reserved for the wealthy. This finding reshapes our understanding of the social hierarchy within Angkor Wat's community.
The landscape of Angkor Wat redefined
Recent advancements in LiDAR technology have revolutionized the understanding of Angkor Wat's landscape, revealing a complex far more extensive and intricate than previously believed. This breakthrough has enabled archaeologists to map hidden terrain beneath dense vegetation, uncovering previously unknown relationships between site elements and exposing a massive, unique structure that was hitherto unknown. The study, which combines high-resolution LiDAR data with targeted ground-based research, provides unprecedented chronological resolution and challenges long-standing assumptions about the Angkor Wat complex.
Uncovering archaeological landscapes at Angkor using lidar
Lidar technology has uncovered a vast, previously undocumented urban landscape at Angkor, revealing the intricate integration of major temples like Angkor Wat within a formally planned city. This groundbreaking discovery challenges the understanding of the Khmer Empire's medieval capitals (9th–15th centuries C.E.) and sheds light on the scale of anthropogenic landscape modifications. The study used airborne laser scanning to penetrate dense forest cover, creating high-precision digital elevation models that exposed hidden archaeological features. Additionally, the data support the hypothesis that infrastructural complexity, unsustainable subsistence practices, and climate variation played pivotal roles in the decline of classical Khmer civilization.
Climate as a contributing factor in the demise of Angkor, Cambodia
Decades-long droughts followed by intense monsoons, likely driven by tropical Pacific sea surface temperature variations including El Niño events, contributed to the decline of Angkor, Cambodia's ancient Khmer Empire capital. A 750-year hydroclimate reconstruction from Vietnamese tree rings revealed that these extreme climatic conditions strained Angkor's water supply and agricultural productivity while damaging its sophisticated water control infrastructure. The study highlights how low-frequency tropical Pacific climate variations can significantly impact Southeast Asian societies, offering insights into the vulnerability of hydraulic civilizations to climate change.
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