He SHihua - Dali Branch of Yunnan hydrology and water resources Bureau，Dali Yunnan 671000
Objectives of the study
Erhai Lake belongs to the tectonic lakes formed by the Himalayan crustal movement, and it is also lakes get in-get out water.This time,we mainly considered the lake morphology method to represent the influence of the topographic change characteristics of the lake on the ecological water level,the monthly minimum water level method to represent the influence of the actual water level change characteristics on the ecological water level, and the ecological water consumption method to represent the influence of the watershed water production conditions on the ecological water level. The water level changes of the Erhai Lake from 1952 to 2020 were analyzed by the three methods, and the lowest ecological water level of the lake and the lowest ecological water level of each month during period of ecological water consumption were proposed, which provide certain references for the Erhai Lake water resources management and scheduling, the rational use of water resources and the ecological environmental protection.