DISTRIBUTION OF BIOAVAILABLE PHOSPHORUS BETWEEN OVERLYING WATER AND SPM UNDER ABRUPT EXPANSION CONDITION  

作　　者：WAN Jun WANG Ze QIAN Shu-qin 

机构地区：[1]College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China [2]College of Mechanics and Materials, Hohai University, Nanjing 210098, China [3]Institute of Pearl River Water Research, Guangzhou 510611, China

出　　处：《Journal of Hydrodynamics》2011年第3期398-406,共9页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program,Grant No.2008CB418203);the National Science and Technology Specific Project of China (Grant No.20080ZX07422-005)

摘　　要：Experiments on Phosphorus （P） fraction characteristics in sediment resuspension were performed under adequate hydrodynamic conditions. It is found that the concentration of Suspended Particulate Matter （SPM） in the eddy current region exhibits the ＂Matthew effect＂. Velocity is an impact factor of the Equilibrium Phosphate Concentration （EPC）, which is related to other hydraulic conditions. Overall bioavailable dissolved P in the SPM causes migration to overlying water and sediment, eventually being converted into a chemical speciation of P. Conditions of resuspension promote A1-P of SPM that migrated to the sediment and water. Concentrations of A1-P in SPM are reduced. P is released from SPM to water bodies, mainly through conversion into particulate P and dissolved total P. Meanwhile, exchange between SPM and sediments occur mainly through Ca-P migration. A1-P and BD-P possess similar geochemical characteristics or source. Ca-P and A1-P exhibit a negative correlation between migration and conversion.Experiments on Phosphorus （P） fraction characteristics in sediment resuspension were performed under adequate hydrodynamic conditions. It is found that the concentration of Suspended Particulate Matter （SPM） in the eddy current region exhibits the ＂Matthew effect＂. Velocity is an impact factor of the Equilibrium Phosphate Concentration （EPC）, which is related to other hydraulic conditions. Overall bioavailable dissolved P in the SPM causes migration to overlying water and sediment, eventually being converted into a chemical speciation of P. Conditions of resuspension promote A1-P of SPM that migrated to the sediment and water. Concentrations of A1-P in SPM are reduced. P is released from SPM to water bodies, mainly through conversion into particulate P and dissolved total P. Meanwhile, exchange between SPM and sediments occur mainly through Ca-P migration. A1-P and BD-P possess similar geochemical characteristics or source. Ca-P and A1-P exhibit a negative correlation between migration and conversion.

关 键 词：bioavailable phosphorus Suspended Particulate Matter （SPM） abrupt expansion flow RESUSPENSION 

分 类 号：P931.5[天文地球—自然地理学] S859.796[农业科学—临床兽医学]