Numerical Analysis Of The Influence Of Sand Mining On River Regime

With the acceleration of urbanization,the demand for river sand is increasing and consumption is huge.The exploitation of river sand reduces the local riverbed,and the surface is conducive to flood control safety.However,the disordered sand mining behavior brings great hidden danger to flood control safety and river stability.In this study,took a sand quarry in leting County of Luanhe River as an example,MIKE-21 FM software is used to build a software simulation of flood evolution based on the two-dimensional incompressible and unsteady flow Reynolds average stress equation,and then the Mike21 fmhd model is constructed to reasonably complete the software simulation of flood evolution,and then the simulation analysis is carried out for the river flood related data based on Mike21 FMBased on the analysis of the evolution law of Luanhe River design flood regime and the measured water and sediment data,this paper sums up and summarizes the water and sediment characteristics of the study river section,and summarizes the internal evolution mechanism based on this;then collects and sorts out the basic data of meteorology,hydrology,geology and topography in the study area,establishes the study river section grid,sets the calculation parameters,and selects the hydrodynamic model After calculating the natural river channel in blocks,the rationality of the model is verified by comparing the calculated water level with the water level of other design results;the scope of the mining area is defined and the amount of sand can be mined in combination with the control planning,sand mining planning and the current situation of the river channel of Luanhe River section where the sand mining site is located;finally,the change of the water level and flow pattern of the river channel before and after the sand mining is analyzed and calculated by using the model,and the sand mining pair is studied Flood control safety of river course and influence of river regime stability.Based on the analysis of the evolution law of Luanhe River design flood regime and the measured water and sediment data,this paper sums up and summarizes the water and sediment characteristics of the study river section,and summarizes the internal evolution mechanism based on this;then collects and sorts out the basic data of meteorology,hydrology,geology and topography in the study area,establishes the study river section grid,sets the calculation parameters,and selects the hydrodynamic model After calculating the natural river channel in blocks,the rationality of the model is verified by comparing the calculated water level with the water level of other design results;the scope of the mining area is defined and the amount of sand can be mined in combination with the control planning,sand mining planning and the current situation of the river channel of Luanhe River section where the sand mining site is located;finally,the change of the water level and flow pattern of the river channel before and after the sand mining is analyzed and calculated by using the model,and the sand mining pair is studied Flood control safety of river course and influence of river regime stability.