Flood inundation uncertainty: The case of a 0.5% annual probability flood event

Flood inundation uncertainty: The case of a 0.5% annual probability flood event
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洪水%20inundation%20不确定性:%20The%20case%20of%20a%200.5%%20annual%20probability%20flood%20event

DOI:
10.1016/j.envsci.2016.01.018
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发表时间:
2016
影响因子:
6
通讯作者:
Prime T
Prime T
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Prime T

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英国各地老化的海岸防御系统正在向管理人员提出挑战,要求他们重新设计方案,以适应极端事件和气候变化,具有成本效益,并对环境影响最小或有益。为了实现有效的设计,需要减少由于沿海强迫内的自然变化而导致的洪水风险评估的不确定性,以重点关注构成最高威胁的条件。英国典型的海岸防御保护标准是能够承受 0.5% 的年度概率事件,历史上也称为 200 年一遇事件。然而,联合波浪-水位概率曲线提供了满足该标准的一系列条件。我们研究了邓杰内斯和罗姆尼沼泽沿海地区,这是一个在栖息地和能源资产方面具有高价值的地区,以量化 0.5% 概率事件产生的洪水深度和范围的不确定性,并探索哪些波浪和水位组合会产生最大的威胁。
Aging coastal defences around the UK are challenging managers to redesign schemes to be resilient to extreme events and climate change, be cost-effective, and have minimal or beneficial environmental impact. To enable effective design, reduced uncertainty in the assessment of flood risk due to natural variability within the coastal forcing is required to focus on conditions that pose highest threat. The typical UK standard of protection for coastal defences is to withstand a 0.5% annual probability event, historically also known as a 1 in 200 year return period event. However, joint wave-water level probability curves provide a range of conditions that meet this criterion. We examine the Dungeness and Romney Marsh coastal zone, a region of high value in terms of habitat and energy assets, to quantify the uncertainty in flood depth and extent generated by a 0.5% probability event, and to explore which combinations of wave and water levels generate the greatest threat.
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