Centre for Advanced Modelling and Geospatial Information Systems, Faculty of Engineering and IT, University of Technology Sydney, Ultimo, NSW 2007, Australia; Department of Geography and Environment, Jagannath University, Dhaka 1100, Bangladesh.
Centre for Advanced Modelling and Geospatial Information Systems, Faculty of Engineering and IT, University of Technology Sydney, Ultimo, NSW 2007, Australia; Department of Energy and Mineral Resources Engineering, Choongmu-gwan, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.
Sci Total Environ. 2019 Nov 20;692:10-22. doi: 10.1016/j.scitotenv.2019.07.132. Epub 2019 Jul 9.
Tropical cyclones frequently affect millions of people, damaging properties, livelihoods and environments in the coastal region of Bangladesh. The intensity and extent of tropical cyclones and their impacts are likely to increase in the future due to climate change. The eastern coastal region of Bangladesh is one of the most cyclone-affected coastal regions. A comprehensive spatial assessment is therefore essential to produce a risk map by identifying the areas under high cyclone risks to support mitigation strategies. This study aims to develop a comprehensive tropical cyclone risk map using geospatial techniques and to quantify the degree of risk in the eastern coastal region of Bangladesh. In total, 14 spatial criteria under three risk components, namely, vulnerability and exposure, hazard, and mitigation capacity, were assessed. A spatial layer was created for each criterion, and weighting was conducted following the Analytical Hierarchy Process. The individual risk component maps were generated from their indices, and subsequently, the overall risk map was produced by integrating the indices through a weighted overlay approach. Results demonstrate that the very-high risk zone covered 9% of the study area, whereas the high-risk zone covered 27%. Specifically, the south-western (Sandwip and Sonagazi), western (Patiya, Kutubdia, Maheshkhali, Chakaria, Cox's Bazar and Chittagong Sadar) and south-western (Teknaf) regions of the study site are likely to be under a high risk of tropical cyclone impacts. Low and very-low hazard zones constitute 11% and 28% of the study area, respectively, and most of these areas are located inland. The results of this study can be used by the concerned authorities to develop and apply effective cyclone impact mitigation plans and strategies.
热带气旋经常影响数以百万计的人，破坏孟加拉国沿海地区的财产、生计和环境。由于气候变化，未来热带气旋的强度和范围及其影响可能会增加。孟加拉国东部沿海地区是受气旋影响最严重的沿海地区之一。因此，进行全面的空间评估对于通过识别高气旋风险地区来制作风险图以支持缓解策略至关重要。本研究旨在使用地理空间技术制作综合热带气旋风险图，并量化孟加拉国东部沿海地区的风险程度。共有 14 个空间标准在三个风险组成部分下进行评估，即脆弱性和暴露、危害和缓解能力。为每个标准创建了一个空间层，并根据层次分析法进行加权。从指数生成个别风险组成部分图，然后通过加权叠加方法将指数整合生成总体风险图。结果表明，极高风险区覆盖研究区域的 9%，而高风险区覆盖 27%。具体而言，研究区域的西南部（桑德维普和索尼戈齐）、西部（巴蒂亚、库图迪亚、马希哈基利、恰卡利亚、考克斯巴扎和吉大港沙达尔）和西南部（特克纳夫）地区可能面临高热带气旋影响风险。低风险区和极低风险区分别占研究区域的 11%和 28%，其中大部分地区位于内陆。有关当局可以使用本研究的结果制定和实施有效的气旋影响缓解计划和策略。
