生产堤溃口展宽与洪水演进过程数值模拟  

Numerical modelling of farm dike lateral breach induced by flooding processes

作　　者：果鹏 夏军强[2] 周美蓉[2] GUO Peng;XIA Jun-qiang;ZHOU Mei-rong(Hubei Key Laboratory of Basin Water Security,Changjiang Survey,Planning,Design and Research Co.Ltd,Wuhan 430010,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]长江勘测规划设计研究有限责任公司流域水安全保障湖北省重点实验室,湖北武汉430010 [2]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《泥沙研究》2022年第6期15-22,共8页Journal of Sediment Research

基　　金：“十四五”国家重点研发计划课题(2021YFC3000102);国家自然科学基金项目(51725902,51579186);长江勘测规划设计有限责任公司自主研发项目(CX2018Z02,CX2019Z15)。

摘　　要：为保护黄河下游滩区群众的生命财产安全修建了大量的生产堤,由于生产堤防护标准很低,极有可能发生溃决,由此引发的漫滩洪水不仅危及滩区的生命财产安全,还将直接威胁黄河大堤安全。生产堤溃决过程中,横向展宽过程比垂向下切过程的发展历时更长,是影响滩区淹没范围及其程度的关键因素。为精细模拟生产堤溃决洪水演进过程,在二维水沙动力学模型的基础上,耦合了生产堤溃口展宽模块,采用基于非结构三角形网格的有限体积法求解二维水沙动力学模块,补充生产堤溃口水流对堤身下层土体的横向冲刷作用及溃口两侧上层悬臂土体发生绕轴崩塌的力学条件。采用模型试验算例检验增添了生产堤溃口展宽模块和新扩展的二维水沙动力学模型,结果表明模型具有较高的计算精度。以黄河下游兰考东明滩区为研究区域,计算了生产堤溃口的横向展宽过程及滩区洪水演进过程。研究结果可为黄河下游滩区治理方案的分析与决策及滩区洪水风险管理提供参考依据。The farm dike is used to protect people and property in floodplain areas of the Lower Yellow River(LYR).These dikes are more likely to breach due to its low height of dike and flood standard,which would cause flood losses.In the process of farm dike breach,lateral widening process is a key factor,because it affects inundated area and its degree.In order to simulate farm dike breach induced flooding processes in details,a integrated model of flood routing processes was proposed.The model integrates a two-dimensional hydro-sediment-morphodynamic module and a farm dike breach module.The two-dimensional hydro-sediment-morphodynamic module was used to simulate the processes of flood inundation in a floodplain area by a cell-centered finite volume method.The lateral widening mechanism during the processes of dike breach were considered in the farm dike breach module.The integrated model was applied to the Lankao-Dongming floodplain area.The widening process of farm dike breach and flood routing processes were analyzed for the real flood event in 2003,especially for widening processes of farm dike breach.These results can not only enrich the research contents of river dynamics,but also provide technical support for the synergistic regulation and flood risk management in floodplain areas in the LYR.

关 键 词：生产堤溃决 二维水沙动力学模型 展宽模块 滩区洪水 

分 类 号：TV122.4[水利工程—水文学及水资源]