Analysis of Sedimentation and Sediment Discharge Application Index in Haibowan Reservoir Area
In order to slow down the sedimentation and prolong the service life of Haibowan Reservoir,the sedimen-tation and sediment discharge indexes of the reservoir area since the operation of the reservoir are analyzed.According to the analysis of the longitudinal and transverse siltation patterns in the reservoir area,the siltation in the reservoir area is mainly in the front slope section and the top slope section,and the beach above 1 075 m in the front slope section and the top slope section has begun to silt up.The sediment deposition in the Haibowan reservoir area is mainly concentrated in the sediment discharge period from July to October,and the sediment deposition in the sediment discharge period from 2014 to 2020 accounts for 66%of the total deposition.The main body of siltation is below the elevation of 1 074 m,and the siltation sediment is 201 million m3,accounting for 95%of the total siltation.The deposition amount of D7-D20 in the top slope section is 182 million m3,accounting for 83%of the total deposition amount,which is the main reservoir section of deposition.The sand discharge period is determined to be from July to October.It is determined that the mag-nitude of sediment discharge is more than 1 500 m3/s,but more than 1 200 m3/s can be selected for sediment discharge in normal and dry years.It is determined that the initial sediment concentration of sediment discharge is more than 2 kg/m3,which can reduce the water level sediment discharge,and the water level of sediment discharge scheduling from July to October is 1 071-1 075 m.But when there are suitable water and sediment conditions,the water level can be re-duced to 1 069 m or below the dead water level for open discharge and sediment discharge.Through the analysis of the sedimentation and sediment discharge operation indexes in the reservoir area of Haibowan Reservoir,the detailed sedi-ment discharge operation scheme can be further formulated with reference to these sediment discharge operation indexes.
万方数据
维普
