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    Exploring the science of evacuation behavior and decision-making during large scale community evacuations: A scientometrics analysis and scoping review
    (Elsevier Ltd, 2026-03-01) Kannangara C; Kuligowski E; Siriwardana C; Zhang G; Adikariwattage V; Jayawardane P
    Understanding how people behave during large-scale community evacuations is important as it can reveal key decision-making gaps which can be addressed to improve emergency planning and to keep communities safer. This study examines the critical gaps in existing research on evacuation behavior and decision-making during disasters by holistically exploring the research domain of evacuation behavior. A total of 667 articles and their references were analyzed using scientometrics methods. This study employs a novel approach to the analysis called overlay networks in CiteSpace. The findings highlight gaps in our understanding of human behavior during the evacuation, such as the stay-or-go decision and travel-related behavior, including destination, mode, route, and return-entry choices, in the context of earthquakes, floods, tsunamis, volcanic hazards, and wildfires. Evacuations triggered by technological disasters are explicitly excluded from this review. It also emphasizes that tourist evacuations remain an underexplored area. Also, the current study reveals that established theories, such as the Protective Action Decision Model (PADM) and the Theory of Planned Behavior (TPB), remain underutilized in research on evacuation behavior during hazards like earthquakes, tsunamis, and volcanic eruptions. This research supports the findings of previous studies in emphasizing the need for interdisciplinary approaches to evacuation research. It also underscores the importance of integrating existing behavioral evidence into evacuation models, alongside efforts to collect additional data. Also, the study emphasizes the importance of strengthening research collaborations with scholars in Asia and Africa. This approach seeks to address the disparity in research conducted across different regions of the world.
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    Integrated flood risk management for urban resilience: A multi-method framework combining hazard mapping, hydrodynamic modelling, and economic impact assessment
    (Elsevier B V on behalf of the College of Civil Engineering, Tongji University, 2025-09-01) Jayawardane P; Rajapakse L; Siriwardana C
    Flooding has become an emerging global catastrophe, generating considerable damage to both infrastructures and lives. Despite the critical need for quantitative assessments of both flood damage and the effectiveness of flood mitigation measures, most existing studies have focused on isolated aspects of flood risk. Only a very limited number of studies have comprehensively integrated hazard mapping, hydrodynamic simulations, and economic damage estimations to evaluate the real-world impact and effectiveness of flood mitigation measures (FMMs). This study presents a multi-method approach to evaluate the performance of such established structural FMMs. Initially, hazard assessments for two selected case study areas, the Colombo Metropolitan Area in Sri Lanka and Auckland, New Zealand, two flood-prone cities with contrasting geographical contexts. Flood inundation mapping for the Madiwela South Diversion, Colombo, Sri Lanka, was performed using hydrodynamic modeling to demonstrate the reduction in flood inundation area and depth after the implementation of the measure, considering six (6) design return periods (RPs). Subsequently, tangible and intangible property damage estimations for “without FMMs” and “with FMMs” were evaluated to identify the benefit of responding to flood conditions, utilising a vulnerability-based economic analysis. In addition to damage estimations, the study adopts a novel approach by conducting an investment viability analysis to find the Benefit-to-Cost ratios and Net Present Value of nine (9) selected FMMs implemented by Sri Lanka Land Development Co-operation (SLLDC). The FMMs implemented by SLLDC were selected from Colombo, Sri Lanka. The quantified damage estimates revealed a reduction in flood damages ranging from 39 % to 63 %, alongside a decrease in flood inundation depths between 9 % and 12 %, and the results underscore the significant effectiveness of FMMs in managing urban flooding and minimising its impacts. This cross-disciplinary methodology enables a transferable framework for resilience-oriented urban planning in diverse hydrological and geographical contexts.