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

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s0p(l:~_f8IG{%r0EFFECTS 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/k(s~1s;Xq

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Author:

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

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-^Y5wJ0d s M3e~k*K0Key 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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水动力学研究与进展B辑水利论文JxG3?+A hS

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Journal:水利论文1|R o} iw-W&@RQ

!N?3CJy6H*TSXh$c0JOURNAL OF HYDRODYNAMICS

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年,卷(期):

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J.lc8O(bG\&@?&w02010, 22(6)水利论文1@/|^iR9w

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(pyhf2iNw&t1j(D0sediment suspension

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submerged macrophytes水利论文G"RpU-o"Ap1A

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bed shear stress水利论文 W,O$c%^ fC:e#S

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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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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水利论文3w {u/~V r \ kLN?

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