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《Journal of Hydraulic Engineering》 2008-07
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Environmental effect of submerged macrophytes restoration on Neijiang River in Zhenjiang City

PANG Yong~1,PENG Jin-ping~1,DING Ling~2,WANG Hua~1(1.Hohai University,Nanjing 210098,China;2.Shanghai Investigation Design and Research Institute,Shanghai 200434,China)  
Submerged macrophytes plays an important role in aquatic system.A numerical model coupling water current with water quality suspended sediment and chlorophyll-a was established to quantitatively estimate the environmental impact on the Neijing River,Zhenjiang City,China,after submerged macrophyte restoration.The result shows that the average suspended sedmlent concentration in Neijiang River in summer-autumn period and spring-winter period were decreased by 11.1% and 11.5% respectively.Due to the purification impact of submerged macrophytes the average concentrations of TN and TP in summer-autumn period were 0.659mg/L and 0.137mg/L,which were decreased by 32.2% and 30.8% respectively.The average concentrations of TN and TP in spring-winter period were also decreased by 29.55 and 27.3%,respectively.As a result of allelopathic effects of macrophytes tile average chlorophyll-a concentration and the area where water bloom might happen were decreased by 37.2% and 49.3%,respectively.After submerged macrophytes restoration the water transparency in summer-autumn period and spring-winter period were increased by 7.9% and 14% respectively,because of the improvement of water quality.
【Fund】: 国家自然科学基金(50579015);; 江苏省科技厅太湖专项(基础)(BK2007742);; 国家863“十五”重大科技专项(2003AA6011002);; 高等学校博士学科点专项科研基金资助课题(20070294019)
【CateGory Index】: X524
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