Research On The Optimal Operational Water Level Of Ebinur Lake In Xinjiang China

The research about optimal operational water level of the lake is one of the most important branches of Integrated Management about lake-Basin, for the work can help to direct the developing modle of the area by coordinating the interest of all the department which relied on the water and controlling the utilizing structure of water resourse.Ebinur Lake is one of the largest lakes in northwest arid desert area of China, the lake not only has many ecological functions:such as restrainting water sources, maintaining soil, regulating climate, conserving biodiversity and so on; but also has some social functions,for instance: carring out scientific observations and adventure tourism activities such as the; In addition, there are rich and valuable Salt Mine in Ebinur Lake, the lake has important economic function as well. So the existence of Ebinur Lake is of great importance for the socio-economic sustainable development of the oasis around the lake.From mid-20th century to the later 0f 1990's, the area of Ebinur Lake has rapidly shrinked because of the strong disturbance of globle change and human activities. The thrinking of lake not only leaded the ecological environment of Lakeside seriously degraded and the biological diversity sharply declined,but also caused the area of desertification increased . The vast land of desertification and the persistent gale coming from Ala mountain pass seriously threatened the health and property of the people. For the past few years, the lake area once restored to the scale of 1950s because of the impact of global warming. However the expansion of water make the land salinized and threatened the the railway along the lake.Ground on the changing feature of water level and its impact and some date from field survey, this article pay close attention to the minimum ecological water level and the limitative water level of flood-prvented. Then, using the theory of system,cybernetics and sustainable development to assess the optimal water level. The main conclusions are as follows:1.The minimum ecological water level of Ebinur Lake In view of the potential hazard which would caused by water scarcity of Ebinur Lake.This paper use the method of morphological analysis of lakes, natural data of water level, the minimum space of creatures, as well as the composite indicator to consider the lowest ecological level, The result shows that taking 191m(570km~2) as a minimum ecological water level is reasonable.2.The limitative flood-prevented water level of Ebinur LakeThe temporary high level of water not only made the salinity land increased but also threaten the railway and the enterprise along the lake, according to the changing feature of the lake area and some reports orrecords which made by predecessor,it is found that when the minimum area exceed 800km~2, the maximum area will be up to 950 km~2 next year.So taking 800 km~2 as the limitative flood-prevented water level is suitable in october every year.3. The optimal water level of Ebinur LakeSelected seven main indexes and quatificated them in accordance with national standards, the paper designed a assessing modle of the optimal level and assessed the current situation of the lake area.Summed up the result mentioned above,the study shows that keeping the lake area about 800 km~2 is propitious to the development of all valley.