南水北调西线一期工程对金沙江上游梯级开发的发电影响

南水北调西线一期调水工程规划从大渡河调水25亿m3，从雅砻江调水15亿m3，调水对金沙江上游大渡河及岷江、雅砻江、金沙江（简称“三江”）的水电开发带来一定影响，调水减少了电站入库水量，使“三江”的可开发水力资源减少；改变了径流的年内分配过程，使年内丰平枯期发电量结构发生变化，装机规模减少；而且，上中游河段受影响大于下游。跨流域调水工程可缓解缺水地区水资源供需矛盾，也将给调水地区带来生态环境及水电开发影响，必须全面规划，统筹兼顾，趋利避害，促进全流域，全地区经济、社会、资源与环境相互协调与可持续发展。

INFLUENCE OF WESTERN "SOUTH-NORTH WATER TRANSMISSION" PROJECT I ON HYDROPOWER DEVELOPMENT OF THE UPPER JINSHA RIVER

A total of 4 billion m~3 water is to be transferred to the northern part of China from the upper reaches of Yalong,Dadu river in the first phase according to the Western South-north Water Transmission Project planning.The implementation of the project will influence the hydropower development of Yalong,Dadu and Jinsha rivers in the upper Yangtze River.It will reduce water discharge and power generation.The installed capacity of hydropower plants will be reduced in the near future.The influence in the upper reaches is larger than the lower stream.As well known,any major transmission project will have both positive and negative impacts,the Western south-north Water Transmission Project is no exception.It will benefit the north water shortage area,but will influence the ecology and environment as well as hydropower in south-western area.We should pay attention to the overall planning with consideration of all concerned aspects in order to promote the economic,social development and mutual coordination between reso