Computational modelling of coastal flooding caused by combined surge overflow and wave overtopping on embankments
Computational modelling of coastal flooding caused by combined surge overflow and wave overtopping on embankments
复制标题
DOI：
10.1111/j.1753-318x.2012.01155.x
复制
发表时间：
2013-06
影响因子：
4.1
通讯作者：
David K. C. Jones;Q. Zou;D. Reeve
中科院分区：
文献类型：
--
作者：
David K. C. Jones;Q. Zou;D. Reeve
本文研究了堤顶以上极端涌浪水位作用下，堤防波浪漫顶与溢流联合作用的过程。采用雷诺平均Navier-Stokes流体体积(RANS-VOF)模型对流体力学进行了数值模拟。为了考察该模型在再现流体动力过程方面的成功，将该模型与实验室的实验测量结果进行了比较。对流量、水深和流速等量进行了比较。将模型预测的溢流流量与经验设计方法进行了比较。识别和解释了模型、实验室测量和设计公式之间出现差异的具体情况，并提供了设计指南。这项研究表明，RANS模型可以很好地描述在极端风暴中遇到的复杂水动力，在极端风暴中，发生溢流和波浪漫顶。研究发现，随着波高的增加，该模型有可能高估了溢流量，并被认为是由于模型中表示湍流的缺陷所致。
In this paper, we investigate the process of embankment wave overtopping combined with overflow because of extreme surge levels that are above the embankment crest. A Reynolds‐averaged Navier–Stokes volume of fluid (RANS‐VOF) model is employed to simulate the hydrodynamics. To investigate the success of the model at reproducing the hydrodynamic processes, the model is compared with experimental laboratory measurements. Comparisons are performed for quantities including discharge, depth and velocity. The overtopping discharge predicted by the model is compared against empirical design methods. Specific conditions under which discrepancies occur between the model, laboratory measurements and design formulae are identified and explained and design guidance is provided. This study has demonstrated that the RANS model can adequately represent the complex hydrodynamics encountered in extreme storms where combined overflow and wave overtopping occurs. A tendency was found for the model to somewhat over‐predict the overtopping volume as wave heights increase and has been hypothesised as being due to shortcomings of the representation of turbulence within the model.