Urban fluvial flood modelling using a two‐dimensional diffusion‐wave treatment, part 2: development of a sub‐grid‐scale treatment
Urban fluvial flood modelling using a two‐dimensional diffusion‐wave treatment, part 2: development of a sub‐grid‐scale treatment
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DOI：
10.1002/hyp.5936
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
D. Yu;S. Lane
中科院分区：
文献类型：
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作者：
D. Yu;S. Lane
本文开发并测试了一种用于城市洪水淹没的二维扩散波模型的亚网格尺度干湿校正。该方法明确认识到，使用粗糙度参数表示亚网格尺度地形将不能充分表示结构要素（例如建筑物、墙壁）对洪泛区的影响，因为这些要素不仅充当动量汇，而且具有质量阻塞效应。后者可能占主导地位，特别是在结构复杂的城市地区。开发的方法使用高分辨率地形数据来开发子网格尺度地形变化的显式参数化，以表示可以被流动占据的网格单元的体积以及该变化对横向通量的时间和方向的影响。这种方法被发现在城市地区的河流洪水淹没的预测显着优于传统的校准的子网格尺度的影响，使用曼宁的n。特别是，它同时减少了使用异常高的n值来表示使用较粗网格过程表示的影响的需要，并增加了模型预测对n变化的敏感性。版权所有© 2005年约翰威利父子有限公司。
This paper develops and tests a sub‐grid‐scale wetting and drying correction for use with two‐dimensional diffusion‐wave models of urban flood inundation. The method recognizes explicitly that representations of sub‐grid‐scale topography using roughness parameters will provide an inadequate representation of the effects of structural elements on the floodplain (e.g. buildings, walls), as such elements not only act as momentum sinks, but also have mass blockage effects. The latter may dominate, especially in structurally complex urban areas. The approach developed uses high‐resolution topographic data to develop explicit parameterization of sub‐grid‐scale topographic variability to represent both the volume of a grid cell that can be occupied by the flow and the effect of that variability upon the timing and direction of the lateral fluxes. This approach is found to give significantly better prediction of fluvial flood inundation in urban areas than traditional calibration of sub‐grid‐scale effects using Manning's n. In particular, it simultaneously reduces the need to use exceptionally high values of n to represent the effects of using a coarser mesh process representation and increases the sensitivity of model predictions to variation in n. Copyright © 2005 John Wiley & Sons, Ltd.