The Algerian coastal zone is under high pressure occurring from natural origin (seismic and tsunamis risks, erosion/accretion, salt water intrusion, etc.) and from human sources (pollution, loss of biodiversity, economic value, etc.). The lack of data, particularly time series over natural coastal process, is an impediment for decision making. In many cases, the implemented coastal protection measures even exacerbate the vulnerability of these zones, particularly the hard engineering solutions. The aim of this work is to produce coastal vulnerability and exposure index maps to erosion and marine submersion, by adapting the coastal vulnerability index (CVI) into coastal risk index (CRI) according to the new vision of the risk adopted by the International Panel on Climate Change (IPCC). This index turned out to be a relevant tool to adjust coastal planning and management decision making, by confirming the vulnerability of some physiographic units and give at local and regional levels a broad image of coastal zone sensitivity to erosion and submersion. This index should be integrated in Integrated Coastal Zones Management policy and management decision making. The mapping of coastal vulnerability and exposure in Bou Ismail Bay shows that it is 80% moderately vulnerable to erosion and submersion. Also, 45% of the bay is highly exposed to coastal hazards. Some sectors are more vulnerable and exposed than others especially in the East side of the bay. The mapping of coastal risk index using coastal hazard component, combined with vulnerability and exposure maps, has led us to identify the degree of erosion and submersion risk in Bou Ismail Bay. The risk mapping shows that 40% of the bay is at high risk level; it means that some procedures should be made to decrease the level of sensitivity and improve resilience of this heavily populated area.

中文翻译：

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使用沿海风险指数（CRI）评估布伊斯梅尔湾（阿尔及利亚）的沿海脆弱性以及遭受侵蚀和潜水的风险

阿尔及利亚沿海地区承受着来自自然起源（地震和海啸风险，侵蚀/增生，盐水入侵等）和人为来源（污染，生物多样性丧失，经济价值等）的高压。缺乏数据，特别是缺乏自然沿海过程的时间序列，这阻碍了决策制定。在许多情况下，已实施的沿海保护措施甚至加剧了这些地区的脆弱性，特别是硬工程解决方案。这项工作的目的是通过根据国际风险评估小组采用的关于风险的新观点，将沿海脆弱性指数（CVI）改编为沿海风险指数（CRI），以绘制出侵蚀和海洋淹没的沿海脆弱性和暴露指数图。气候变化（IPCC）。该指数通过确认某些自然地理单位的脆弱性，并在地方和区域各级为沿海地区对侵蚀和淹没的敏感性提供了广泛的印象，从而成为调整沿海规划和管理决策的相关工具。该指数应纳入沿海地区综合管理政策和管理决策中。布伊斯梅尔湾（Bou Ismail Bay）沿海脆弱性和暴露程度的地图显示，该地区80％的中等脆弱性易受侵蚀和浸没。此外，海湾的45％高度暴露于沿海灾害。有些行业比其他行业更容易受到影响，尤其是在海湾东部。利用沿海灾害成分，结合脆弱性地图和暴露地图，绘制沿海风险指数，使我们确定了Bou Ismail湾的侵蚀和浸没风险程度。风险图显示40％的海湾处于高风险等级；这意味着应该采取一些措施来降低敏感度并提高这个人口稠密地区的复原力。