Influence of Incity River Sediment Dredging to Endogenous Release
The internal Qinhuai River in Nanjing City of China was selected for the research on the influence of incity river sediment dredging to endogenous release by the experiment of simulating the endogenous releases at different depths of dredging so as to analyze the correlation between the forms and the release amount of phosphorus in the sediment and the change of the phosphorus forms before and after the sediment release. The result has shown that: dredging can more or less control the release of PO4 3--P in the sediment as the release rate distinctly decreases at the dredging depths of 30cm and 40cm, the release rate of NH4 +-N rises after dredging, the release rate of nitrogen does not change too much at different depths of dredging, and the release of CODMn can be inhibited by dredging. Exchangeable phosphorus(Ex-P), Al-and Fe-bound phosphorus(Al-P,Fe-P) are highly correlated to the concentration of total dissolved phosphorus(TDP) in the overlying water while occluded phosphorus(Oc-P), Ca-bound phosphorus(Ca-P) and organic phosphorus(Or-P) are poorly correlated. After the sediment has released, the content of Ex-P, Al-P, Fe-P and Or-P is distinctly decreased while the content of Oc-P and Ca-P is a little increased, which means that during the process of sediment releasing, there is a trend of Or-P being transformed into inorganic phosphorus, and also a trend of Al-P and Fe-P being transformed into Oc-P and Ca-P.
Incity river simulated dredging endogenous release phosphorus forms
Ying Xu Tianyi Xu
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Educat
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）