On using flood-excess volume in flood mitigation, exemplified for the River Aire Boxing Day Flood of 2015
On using flood-excess volume in flood mitigation, exemplified for the River Aire Boxing Day Flood of 2015
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关于利用洪水过剩量进行防洪，以 2015 年艾尔河节礼日洪水为例
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发表时间：
2018
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影响因子：
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通讯作者：
T. Kent
中科院分区：
文献类型：
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作者：
O. Bokhove;M. Kelmanson;T. Kent
本文的目标有三个方面，即：（i）定义很少使用的洪水过量体积（FEV）的概念，即超过选定的洪水水位阈值的洪水体积;（ii）显示如何估计2015年节礼日洪水的FEV。以及，（iii）分析FEV在评估艾尔河假想防洪计划（FASII）中的使用，主要是基于实际的利兹的洪水缓解计划II（FASII）。所采用的技术是数据分析结合一般河流水力学和估计使用的界限。通过将FEV等效地表示为具有一定边长和深度（1到几米）的方形湖泊，具有相同的容量，很容易将其尺寸可视化并将其与所考虑的河谷进行比较。FEV分析提供了新的洪水缓解措施的成本效益的估计，无论是之前或与更详细的水动力数值和实验室模拟河流流量。它被用来阐明我们的新FASII的防洪减灾的五种不同的情况下，每一种情况下涉及更高的（比现有的）防洪墙和增强的洪泛平原存储站点的组合都更接近和进一步上游的利兹。这一方法的一个组成部分是成本效益分析。对于决策者来说，FEV的另一个优点是，它可以用于以直接和直观的方式分析和选择防洪措施，从而为广泛的，特别是非技术性的受众和市议会规划部门提供更好的理解前景。
The goals of this paper are threefold, namely to: (i) define the rarely used concept of flood-excess volume (FEV) as the flood volume above a chosen river-level threshold of flooding; (ii) show how to estimate FEV for the Boxing Day Flood of 2015 of the River Aire; and, (iii) analyse the use of FEV in evaluating a hypothetical flood-alleviation scheme (FASII) for the River Aire, largely based on the actual Leeds’ Flood-Alleviation Scheme II (FASII). Techniques employed are data analysis combined with general river hydraulics and estimation using bounds. By expressing FEV equivalently in terms of a square lake with a certain side-length and depth (of one to a few metres), with the same capacity, it becomes easy to visualise its dimensions and compare it with those of the river valley considered. FEV analysis provides cost-effective estimates of new flood-mitigation measures, either prior to or in tandem with more detailed hydrodynamic numerical and laboratory modelling of river flows. It is used to illuminate five different scenarios of flood mitigation for our new FASII, with each scenario involving a combination of higher (than existing) flood-defence walls and enhanced flood-plain storage sites both closer to and further upstream of Leeds. An integral part of this approach is a cost-benefit analysis. For policy makers, a further advantage of FEV is that it can be used to analyse and choose between flood-mitigation measures in a direct and visual manner, thereby offering better prospects of being understood by a wide, particularly non-technical, audience and city-council planning departments.