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By means of rainfall simulation, the mechanism of non-point source pollution of organochlorine pesticides (OCPs)by runoff was studied. The results showed that surface runoff perhaps played a more important role than the seepage water in the migration of OCPs from soil to water. The concentrations of OCPs in the runoff decreased with sampling time and then reached stability after 60 minutes. The soil...
Farm land waste water is one of the main sources of nonpoint pollution, and BMPs is an effective technology. The characteristics of farm land wastewater are described in this paper. In Poyang watershed a series of Best Management practices (BMPs) are designed, including grass buffer strip, ditch, fishpond, facultative pond and constructed wetland. The results show that BMPs play a part for SS, BOD5,...
In this paper, wet deposition of nitrogen in a small watershed of the Three Gorges Reservoir Area (TGRA) was investigated from 2004 to 2008. These results indicated that average TN concentration in rainwater was 2.02 mg L-1, which exceeded the threshold of eutrophication. TN concentrations were higher in the dry season than that in the wet season, but the wet season was the key period for N deposition...
Non-point source pollutants have been accumulated for a long time, and the soil is always easy for eroding in northern area of Jiangsu province. The pollutants flood into the river with rainfall runoff in flood seasons, which has become the one of the important reasons that causes water quality not stable in this area. Three typical lands in northern water-deficient area of Jiangsu province were studied...
Surface erosion is a serious environmental problem in land degradation caused to decrease in the lands agriculture value and increase in sediment and water pollution. In erosion and sediment studies, erosion types mapping is one of the most important and basic maps to determine the preference in soil conservation program. In this research, the aim is to evaluate some methods in providing soil surface...
It has been found that non-point source pollution - excessive nitrogen loading is one of the main reasons for the eutrophication of Miyun Reservoir, Beijing, China. At present, the research about eutrophication is still confined to a single level of analysis lacking a full perspective of monitoring, integrated simulation and evaluation. The model domain is the area of Miyun Reservoir, Beijing. This...
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