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PRACTICABILITY OF PRE─DAM FOR EUTROPHICATION CONTROL IN YUQIAO RESRVOIR

Bian Jinzhong;Wang Jianhua;Wang Hongqi;Cai Ling;Zhu Xuan(Tianjin Institute of the Environmenfal Profection, Tianjin 300191)  
The Pre-dam can be formed in front of the area of Yuqiao Reservoir,which is about 9 km ̄2 and content is 2 × 10 ̄4m ̄to 2.5× 10 ̄7m ̄3by damming theentrance of the old river course.It can play a synthetic role including phy- sically,chemically and biologically in delaying the retention time of water intothe pre-dam,reducing the flow speed and homogenizing flow field, purifying thewater and damming the silt and nutrient salt in pre-dam for the purpose ofreducing the content of nutrient salt and inhibiting the over reproduction ofalgae in main reservoir so as to control and slow down the pace of eutrophi- cation in Yuqiao Reservoir.
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