Analysis Of The Influence Of Water Conservancy Construction On Ecological Environment In Poyang Lake Districtstudy On Ecological

Poyang Lake is the largest freshwater lake in China,and it is an important storage Lake in the Yangtze River and a wetland with world influence.With the construction of the Yangtze River dry tributary control of reservoir,especially the Yangtze River Three Gorges dam operation since the Poyang Lake hydrological rhythm changes,hydrological observation data shows that(Lake Xingzi hydrological station),is a low level of less than 10 meters ahead of time,the time of 33 days earlier than the average of about 8 meters lower than the average time,ahead of time 40 day.Two is the extension of the dry season,the water level is less than10 meters to extend the duration of 61 days,less than the average length of 8 days to extend the number of days.The three is the water level dropped,dry season average decrease of 2meters,body area shrinking.Four is the deterioration of water quality,the overall water quality in the low water period decreased from the first class III of the last century to the present class.The low water level of Poyang Lake in autumn and winter caused by reservoir water storage in the mainstream of the Yangtze River has a serious impact on people's livelihood,ecology and economy in Poyang Lake area.For the restoration and scientific adjustment relations arena,improve lake water resources and water environment carrying capacity,the State Council approved the comprehensive planning of the Yangtze River Basin "(2012-2030)")proposed the construction of Poyang Lake water conservancy project,and included 172 major water-saving water projects to accelerate.Poyang Lake water conservancy project is a complex design of the lake and river ecological environment protection and other issues,a high degree of concern at home and abroad.After the Ministry of water resources in conjunction with relevant departments and Jiangxi province to carry out a large number of thematic research.The general idea is in the upstream reservoirs after flood water before storing water,appropriate to raise the water levels in the lake area,the dry season increases the area of water,improve the ecological environment,water supply,irrigation,fisheries,shipping,schistosomiasis control conditions.Adhere to the ecological way,construction of open gate project in accordance with the full,dry tone does not flood control "principle,the end of March to the end of August to the end of the flood of rivers and lakes connected,to flood control regulation for the hub,two lakes,dynamic,and consider the lake and the Yangtze River water ecological protection and water resources the need is a lake in the dry season to maintain an appropriate level or by reducing the water level scheduling wet landing process,realize the Wetland Dynamic Characteristics of water level fluctuating demand as much as possible,protect and restore the water ecological environment,maintain lake ecological healthy relationship.