丹江口水库运行后下游河道冲刷特性分析

 丹江口水库的修建改变了原来的来水来沙特性，对水库下游河床造成了不同程度的冲刷。加高后的丹江口大坝为南水北调中线水源工程。工程运用后必将对丹江口水库大坝下游河床、水资源供给及生态环境等方面都将产生影响，为了与工程运用后作一对比，2005年对丹江口水库坝下游丹江口至碾盘山河段进行了一次1/10 000水道地形测量。从历年观测资料看，从丹江口至碾盘山河段即汉江中游各河段河床出现了大量的、不同程序的冲刷，经分析计算得出，坝下游河段冲刷强度随时间及距坝里程的不同而发生变化，并且与来水量密切相关。

Scouring Characteristics of Downstream Channel after Operation of Danjiangkou Reservoir

The running of Danjiangkou Reservoir has changed the characteristics of original water-sediment condition of Hanjiang River,the downstream river-bed of the reservoir has been caused scouring.The enhanced Danjiangkou Dam is the water-source project of the mid-route of South-North Water Transfer Project.The water in the reservoir over the spillway crest will result in very high velocity,and thus affect downstream river-bed,water resources supply and eco-environment after the project operation.In order to cont...