EFFECTS OF SUBMERGED MACROPHYTES ON SEDIMENT SUSPENSION AND NH4-N RELEASE UNDER

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EFFECTS OF SUBMERGED MACROPHYTES ON SEDIMENT SUSPENSION AND NH4-N RELEASE UNDER HYDRODYNAMIC CONDITIONS

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Abstract:Aquatic vegetation affects sediment suspension and nutrient release by changing the flow structure.Experiments on the influence of submerged vegetation on flow structure,sediment suspension,and NH4-N release were carried in a flume with natural submerged vegetation.Turbulence characteristics in the vegetation section were measured using a three-dimensional acoustic Doppler velocimeter.The effects of submerged vegetation on bed shear stress(τb),sediment suspension,and NH4-N release were analyzed.Results show that with vegetation,bed shear stress is reduced by about 20%-80%,which,in turn,reduces sediment suspension.The impact of submerged vegetation on sediment suspension and NH4-N release should be considered along with flow intensity.When the flow Reynolds number is relatively small,the submerged vegetation is quite capable of inhibiting sediment suspension and reducing NH4-N release,but when the Reynolds number reaches a certain value,the presence of aquatic plants exacerbates sediment suspension and promotes NH4-N release.Results also reveal that a highly significant positive correlation exists between NH4-N concentration and water turbidity in both vegetated and non-vegetated channels.

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WANG Chao[1] WANG Cun[2] WANG Ze[3]

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Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,ChinaKey Laboratory of Integrated Regulation and Resource Department on Shallow Lakes,Ministry of Education,Hohai University,Nanjing 210098,China;College of Mechanics and Materials,Hohai University,Nanjing 210098,ChinaCollege of Mechanics and Materials,Hohai University,Nanjing 210098,China水利论文[n6KmRn

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y}7@Z/LE:r0水动力学研究与进展B辑水利论文}N.@ nj"I9[,z

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JOURNAL OF HYDRODYNAMICS水利论文3f)R$_9XN{-?8d

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2010, 22(6)

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H.]a7My/z#ZL9M0submerged macrophytes

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-L*m6u,Z(L)Nx0HYDRODYNAMIC CONDITIONS sediment suspension vegetation bed shear stress Reynolds number flow structure nutrient release water turbidity aquatic plants significant correlation influence positive changing natural impact small quite水利论文&^0Y?5@.knH7Hf{-FO O

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"lxK [,IL0the National Basic Research Program of China(973 Program),the Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes,Ministry of Education,Hohai University

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