山体滑坡影响下沟道系统中含沙水流流动稳定性研究  

Study on the Flow Stability of Sandy Water in Gully System under the Influence of Landslide

作　　者：吴汉美 李春娥[1] 段国凡 WU Hanmei;LI Chune;DUAN Guofan(City College of Science and Technology,Chongqing University,Chongqing 402167,China)

机构地区：[1]重庆大学城市科技学院,重庆永川402167

出　　处：《灾害学》2021年第3期60-63,共4页Journal of Catastrophology

基　　金：重庆市基金项目(KJQN201902505);国家青年科学基金项目(51905824)。

摘　　要：为确定外界条件变动对沟道水流流动稳定性的影响,对山体滑坡影响下沟道系统中含沙水流流动稳定性展开研究。利用射流冲击理论,归纳泥沙颗粒的运动形式,从而确定泥沙对水流紊动的作用效果,完成山体滑坡影响下沟道系统含沙水流的运动特性分析。在此基础上,根据摩阻流速规律,定义垂线流速的分布公式,再通过计算水流涡量数值的方式,确定沟道出渗作用对含沙水流结构的实际影响。模拟实验结果表明,在山体滑坡作用下,沟道系统内的含沙浓度不断增大,导致含沙水体泄流能力急剧提升,降低沟道水流的稳定性流动能力。In order to determine the influence of external conditions on the flow stability of gully,the flow stability of sand-bearing water in gully system under the influence of landslides is studied.By means of jet impingement theory,the movement forms of sediment particles are summarized,and the effect of sediment on flow turbulence is determined.On this basis,according to the law of frictional velocity,the distribution formula of vertical velocity is defined,and the actual influence of channel seepage on the structure of sand-bearing water flow is determined by calculating the vorticity of water flow.The simulation results show that under the action of landslides,the sediment concentration in the gully system increases continuously,which leads to a sharp increase in the discharge capacity of the sand-bearing water body and reduces the stability and flow capacity of the gully.

关 键 词：山体滑坡 沟道系统 含沙水流 流动稳定性 水流紊动 摩阻流速 垂线流速 水流涡量 

分 类 号：TV142.1[水利工程—水力学及河流动力学] X43[环境科学与工程—灾害防治]