2　Research Area

Chang Lake is the third large lake in Hubei Province in the northeast of Jinzhou City and the southwest of Shayang City,it's an important lake for flood regulation and storage in Chang Lake catchment supplying 6.97×108 m3 storage volume for the catchment of 3240km2 scale.Moreover,Chang Lake supplies fresh water to millions of people in the bordering areas,and provides important support for the economic development of the Four-Lake area.

Chang Lake was connected to Yangtze River and Han River in history,but it was separated from rivers gradually by human activity,which caused a series of water environmental problems,such as decrease of lake area,water pollution,reduction of biodiversity,et al.Therefore,water connection projects between lakes and rivers has been an argent construction for Chang Lake basin to recover the river-lake ecological system.