Erhai Lake Basin Water Pollution Forecast And Countermeasures

ErHai Lake, the 7^th largest freshwater lake of China, has an area of 2565 km². It is the origin of Dali's 4000 years cultural history. ErHai Lake is the core of the "national nature protection areas of ChangShang Mountain and ErHai Lake", which is one of some Chinese rural area lakes under the good condition for well protection by government, and it seems a lucky plateau pearl. Now it is facing a critical nutrition change phase: blue agal bloom occourred in Lake Erhai, the clarity of the lake declines to the lowest rate in the history, some water areas appear V type water, and some under water plants die in large areas, which threaten the nature protection, drinking water, and tourism et.of ErHai Lake, and the condition is very severe. It is a strategy decision to take emergency protective salvage in time and keep rich nutritionlizm of ErHai lake under control with determination, or to let the condition getting worse, and put the emphasis on disposal, which is the routine way to solve the problem.Through the analysis of over 10 years ErHai lake water quality and its input pollution substance index, and linking with the Dali city development target as the center city of the west of Yunnan province, the author puts forward that to forecast the pollution substance in drainage area and analyze the water quality of ErHai lake under the high, middle and low society developments modes, and some relative protection and disposal suggestions and projects to solve the problem.