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

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-x:b}(n7T0Ed0EFFECTS 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.水利论文rF?F$O0@]

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m5];HZ.S2UmS]0Author:水利论文'yE2r3A*G&lW

3tsc]d(X4I0WANG 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

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zI!B p#l5c V"G0水动力学研究与进展B辑

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Journal:水利论文H RaND4Iw*H

c4E+CQvZ7}1[xKR0JOURNAL OF HYDRODYNAMICS

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2010, 22(6)水利论文YI+c"jh0P~.s

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m af T.w;RB0Keywords:

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*o7q9O!q r-Q0sediment suspension

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submerged macrophytes

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*v1E V g5t8F0turbulence behavior

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bed shear stress

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c{q9Fy0turbidity水利论文P!_7f*~5?)l

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HYDRODYNAMIC 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

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基金项目:水利论文$}!]GU,F-A-c'H;e

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the 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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