Assessment of tangible coastal inundation damage related to critical infrastructure and buildings: The case of Mauritius Island

IF 4.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY International journal of disaster risk reduction Pub Date : 2024-11-01 DOI:10.1016/j.ijdrr.2024.104909
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Abstract

Storm tides, which combine sea level rise (SLR), astronomical tides, and storm surges generated by tropical cyclones, pose significant threats to coastal zones, leading to flooding and substantial damage to property and infrastructure.There is a clear upward trend in the frequency of storms reaching tropical cyclone strength. A notable example is Cyclone Belal, which struck Mauritius on January 2024, during high tide, causing extensive infrastructure damage. This underscores the importance of conducting risk assessments to identify vulnerable areas and develop risk reduction strategies. However, quantitative risk assessments of storm tides are often challenging due to the lack of long-term projections. To address this, we developed a GIS-based flood model for Mauritius to simulate inundation areas and quantify the assets exposed to flooding. Under current conditions, the estimated damage exposure from extreme coastal flood events with return periods of 50–500 years is significant, with 6.2 % and 27.1 % of the area inundated, respectively. By 2100, damage exposure associated with these events is projected to increase by a factor of 1.1, with minimal variation between sea-level rise scenarios (0.3m). However, by 2200 and 2300, damage exposure is expected to rise by factors of 3.1 and 6.6, respectively. In the worst-case scenario for 2500, Mauritius could experience maximum inundation of 66.3 km2, with buildings covering 5.02 km2 submerged. Additionally, this study presents a detemporalized inundation scenario to assess impacts from any coastal flood event. This approach enables the identification of critical thresholds (1.5 m and 4.5 m) and, beyond which significant increases in damage exposure are likely, and allows for evaluating adaptation strategies against user-defined levels of change, rather than relying solely on predefined scenarios. These findings highlight the urgent need for strategic sectoral interventions to address the widespread consequences of coastal inundation, especially in light of critical thresholds for remedial action.
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评估沿海洪水对重要基础设施和建筑物造成的有形破坏:毛里求斯岛案例
风暴潮结合了海平面上升(SLR)、天文潮汐和热带气旋产生的风暴潮,对沿海地区构成重大威胁,导致洪水泛滥,对财产和基础设施造成巨大破坏。一个明显的例子是,2024 年 1 月,"贝拉勒 "气旋在涨潮期间袭击了毛里求斯,造成大量基础设施损坏。这凸显了进行风险评估以确定脆弱地区和制定降低风险战略的重要性。然而,由于缺乏长期预测,风暴潮的定量风险评估往往具有挑战性。为解决这一问题,我们为毛里求斯开发了基于地理信息系统的洪水模型,以模拟洪水淹没区域并量化暴露于洪水中的资产。在当前条件下,重现期为 50-500 年的极端沿海洪水事件造成的损失估计很大,分别有 6.2% 和 27.1% 的地区被淹没。预计到 2100 年,这些事件造成的损失将增加 1.1 倍,不同海平面上升方案之间的差异极小(0.3 米)。然而,到 2200 年和 2300 年,损失风险预计将分别增加 3.1 倍和 6.6 倍。在 2500 年的最坏情况下,毛里求斯最大淹没面积为 66.3 平方公里,5.02 平方公里的建筑物被淹没。此外,本研究还提出了一种分时段淹没情景,以评估任何沿海洪水事件的影响。这种方法可以确定临界阈值(1.5 米和 4.5 米),超过这些阈值,损失可能会显著增加,还可以根据用户定义的变化水平评估适应战略,而不是仅仅依赖于预定义的情景。这些研究结果突出表明,迫切需要采取战略性部门干预措施,以应对沿海淹没造成的广泛后果,特别是考虑到补救行动的临界阈值。
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来源期刊
International journal of disaster risk reduction
International journal of disaster risk reduction GEOSCIENCES, MULTIDISCIPLINARYMETEOROLOGY-METEOROLOGY & ATMOSPHERIC SCIENCES
CiteScore
8.70
自引率
18.00%
发文量
688
审稿时长
79 days
期刊介绍: The International Journal of Disaster Risk Reduction (IJDRR) is the journal for researchers, policymakers and practitioners across diverse disciplines: earth sciences and their implications; environmental sciences; engineering; urban studies; geography; and the social sciences. IJDRR publishes fundamental and applied research, critical reviews, policy papers and case studies with a particular focus on multi-disciplinary research that aims to reduce the impact of natural, technological, social and intentional disasters. IJDRR stimulates exchange of ideas and knowledge transfer on disaster research, mitigation, adaptation, prevention and risk reduction at all geographical scales: local, national and international. Key topics:- -multifaceted disaster and cascading disasters -the development of disaster risk reduction strategies and techniques -discussion and development of effective warning and educational systems for risk management at all levels -disasters associated with climate change -vulnerability analysis and vulnerability trends -emerging risks -resilience against disasters. The journal particularly encourages papers that approach risk from a multi-disciplinary perspective.
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