Objectives of the study
The water diversion project in central Yunnan is a strategic basic project for the sustainable development of Yunnan Province. In the 1950s, the idea was put forward. The preliminary work has been studied for nearly 16 years. The water is taken from the Jinsha River, and the total length of the water conveyance trunk is 664 kilometers. It passes through Lijiang, Dali, Chuxiong, Kunming, Yuxiand Honghesix cities, spanning the four major river basins of Jinsha River, LancangRiver, Pearl River and Red River, and the design flow of the canal head is 135 m3/ s. The project has fundamentally solved the contradiction of water shortage in central Yunnan, repaired and improved the ecology and water environment of lakes and rivers in central Yunnan, and played an important role in promoting the sustainable development of economy and society in Yunnan Province. The Dali II section of the Central Yunnan Water Diversion Project is located in the watershed intersection of the Jinsha River, the LancangRiver and the Red River, involving the plateau lake Erhai. The feasibility of using ErhaiLake to transport water, the comparison of the first section of the west line and the east line of the front section of Haidongand the route selection of the sensitive area of environmental influence are studied. Finally, the scheme of not using ErhaiLake and the east line of the front section of Haidongwas selected based on the principle of avoiding karst water system and reducing groundwater discharge, and the overall layout scheme of water transfer in Jinsha River Basin was formed.