Study Of Numerical Sim Ulation Flow Field Near Spur Dike With Flood Control Project Of The Sipaikou Sectiol Of The Yellow River In Ningxia

In the Shizuishan section of the upper Yellow River,the riverbed is mainly composed of fine sand.The construction of the intercepting project in the river section of the fine sand river bed is rare at home and abroad.There will be a series of problems before and after the construction of the project,such as scouring in front of the dam,piping phenomenon,dam break,mainstream trend after interception,etc.the study.In the process of interception,in order to divert water and divert,a series of spur dikes,joint dams and diversion open channels were constructed,which greatly affected the flow movement,sediment movement and river bed deformation of the river section.The structure of the dam dam head is an important parameter affecting the bank protection capacity of the spur dike.In this paper,the three-dimensional flow field near the spur dike is simulated by the VOF model.The reliability of the numerical simulation method is verified by the measured results.On this basis,for the construction part of the spur dike in the whole project,the variation of the surrounding flow field under the partial scouring and silting state of the spur dikes with different structural forms is studied by numerical simulation.Different models were established for the curved spur dike and the rectangular spur dam to simulate the flow field around the dam dam head under local scouring and silting conditions.According to the analysis of the relevant test results of the flood control project of the Sipaikou section of the Shizuishan area of the Yellow River Phase ? closure project,the related research was carried out in combination with numerical simulation.The main work of this paper is as follows:(1)The measured results of the flow velocity and water depth distribution of 13 typical representative sections of the four-row section of the river are analyzed;(2)The development of the river leading to the flood control project is analyzed.(3)Comparing the numerical simulation results of typical section flow velocity and water depth with the measured results,and predicting the future development trend of the river;(4)Numerical simulation of the flow field near the main dam in the dam It is proposed to propose a more practical and reasonable dam layout.According to the simulation results,combined with the relevant post-processing and computer programming,the vorticity field around the spur dike is drawn,and the influence of the local scouring and silting on the dam dam head is considered.The diversion capacity of the spur dikes with different structural forms and the dissipation of energy are compared.According to the velocity and vorticity field data,the arc-shaped structure with weak influence under the action of scouring and silting is selected,and it is selected as the better dam head form,which provides reference for future scientific research and engineering development.