Overwash vulnerability assessment based on long-term washover evolution
Overwash vulnerability assessment based on long-term washover evolution
复制标题
基于长期冲刷演化的冲刷脆弱性评估
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
J. Dias
中科院分区：
文献类型：
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作者：
T. Garcia;Ó. Ferreira;A. Matias;J. Dias
根据堰塞岛系统历史上的冲刷演变，开发了一种评估冲刷脆弱性的综合方法。在制定的脆弱性指数中涉及了三个不同的过冲问题：过冲岸线比率、最大过冲入侵重复次数和完全屏障过冲。利用涵盖1947-2001年期间的航空摄影目录，将这些指数应用于葡萄牙南部里亚福尔摩沙系统的障碍物。观察到洗涤演变的历史趋势在所分析的障碍之间是不同的，但总的来说，在整个分析期间洗涤的数量和尺寸都有所减少。获得的最终溢出诊断允许为每个屏障定义集成的溢出漏洞评级，漏洞范围从低到极端。该方法已取得成果，可帮助沿海管理人员提供有关堰塞岛系统溢流危险的信息，确定溢流的时间和地理分布，并提供关于未来最有可能发生溢流的指示。
An integrated methodology for evaluation of overwash vulnerability is developed with respect to the historical washover evolution of a barrier island system. Three different aspects of overwash are addressed in the vulnerability indices developed: overwashed shoreline ratio, maximum overwash intrusion recurrence, and complete barrier overwash. The indices were applied to the barriers in the Ria Formosa system in Southern Portugal using an aerial photography catalogue covering the period 1947–2001. Historical trends of washover evolution were observed to be different between the barriers analysed, but generally, there was a decrease in washover number and dimensions throughout the analysed period. The final overwash diagnostic obtained allowed an integrated overwash vulnerability rating to be defined for each barrier, with vulnerabilities ranging from low to extreme. The methodology has produced results that may assist coastal managers with information concerning barrier island system overwash hazard, define the temporal and geographical distributions of overwash, and provide indications as to where overwash is most likely to occur in the future.