大理河2017年“7·26”暴雨产洪产沙浅析

Analysis of Runoff and Sediment Yield from “7·26” Flood in Dali River Basin in 2017

阐述了大理河2017年"7·26"暴雨洪水的水文情势,计算了次洪径流量和次洪输沙量,并与历史洪水进行了对比分析,发现本次洪峰流量、次洪径流量和次洪输沙量在历史点群的左上方或点群中间。结果表明:几十年水土保持工作和生态修复政策的实施,大理河流域下垫面发生了一定程度的改变,但是遇到"7·26"这样的强降雨,依然会产生高含沙洪水。

Hydrological regimes of the flood occurred in Dali River on July 26,2017 were introduced.The amounts of runoff and sediment of this flood were calculated and compared with the history floods.It is found that peak flow and runoff are higher than the history floods,and sediment is in the middle of the group.The results show that the underlying surface of the Dali River basin has changed in some degree,after the harness of soil and water conservation and the implementation of ecological restoration policy for several decades.However,with the occurrence of high intensity rainfall such as“7·26”,it will generate large peak discharge,runoff and relatively large amount of sand.