摘要
滑坡涌浪是库区水灾害的风险来源之一,开展涌浪预测研究对提升航道安全,减小近岸洪水风险具有重要的工程应用价值,但滑坡体入水形成涌浪的动力过程十分复杂,目前对其进行准确模拟仍是棘手的问题。基于等效流体假设,将非均质的碎石土滑坡视为连续的特殊流体,通过自定义函数编写滑坡体沿滑动面运动的摩擦阻力程序,利用Realizable k-ε湍流模型与VOF法建立了碎石土滑坡涌浪数值模拟模型。研究结果表明:该方法可较好地模拟碎石土滑坡体水下运动与堆积形态,且获得的涌浪波幅精度较高;阻力模型中摩擦系数与内摩擦系数同滑坡体的变形速率分别成反比关系,而湍流阻力系数增大仅能减缓滑坡后缘的变形速率。研究成果可为定量评估碎石土滑坡涌浪灾害风险、制定库区涌浪灾害紧急避险预案提供参考。
Landslide surge is one of the risk sources of water disasters in a reservoir area.It is of great engineering application value to carry out surge prediction research to improve channel safety and reduce near-shore flood risk.However,the dynamic process of landslide body entering water to form surge is very complicated.At present,it is still a difficult problem to accurately simulate it.Based on the assumption of equivalent fluid,the heterogeneous gravel soil landslide was regarded as a continuous special fluid,and a friction resistance program of the landslide body moving along the sliding surface was written by a custom function.The Realizable k-εturbulence model and VOF method were used to establish the numerical simulation model of gravel soil landslide surge.The results showed that this method can better simulate the underwater movement and accumulation form of gravel soil landslide,and the accuracy of surge amplitude was high.In the resistance model,the friction coefficient and the internal friction coefficient were inversely proportional to the deformation rate of the landslide body,while the increasing of the turbulent flow resistance coefficient could only slow down the deformation rate of the trailing edge of the landslide.The research results can provide a reference for quantitatively evaluating the risk of surge disaster of gravel soil landslide and formulating the emergency plan of surge disaster in a reservoir area.
作者
薛宏程
彭杏瑶
马倩
卿正阳
XUE Hongcheng;PENG Xingyao;MA Qian;QING Zhengyang(College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China;Southwest Waterway Engineering Institute,Chongqing Jiaotong University,Chongqing 400016,China)
出处
《人民长江》
北大核心
2023年第7期153-158,共6页
Yangtze River
基金
重庆市教委科学技术研究项目(KJQN201900711)
国家自然科学基金青年科学基金项目(52109150)。
