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Xiangtan Stream basin, a typical hilly country in the Sichuan Basin, is adversely affected by overuse of chemical fertilizer on the slope farmland and pig manure produced by intensive pig breeding farm located in the upper watershed. The nitrogen and phosphorus compounds in the runoff, sediment and manure contaminate the soil and water bodies. SWAT (Soil Water and Assessment Tool) was applied to characterize...
Non-point source pollution has became a major water pollution source in Northeast China. A small typical agricultural watershed was selected to test the validity of the annualized agricultural non-point source (AnnAGNPS) model in Northeast China. The best available data were assembled in the analysis. The model validity was tested by nitrogen and phosphorus concentration data. A good correlation was...
Based on the hydrogeology condition of petroleum oil-contaminated sites in Northeast of China, the formation status was setup in lab scale. The migration characteristics of benzene, xylene and naphthalene in heterogeneous soil were investigated. The results showed that migration velocity of the benzene was the fastest, followed by xylene and naphthalene. In addition, the migration velocity in horizontal...
It constructs a basic water circular economic allocation and accounting frame for ecological compensation according as mechanism design general model theory. Water circular economic accounting includes water resources amount and flow accounting, water quality and pollutant accounting, environmental-economic accounting and water value flow accounting. It is put forward that a model of two-dimension...
After the completion of the Three Gorges dam, a 30 m high water-level-fluctuating zone (WLFZ) will appear along the banks, and will form a seasonal wetland ecosystem. According to the program of storing water in the Three Gorges reservoir, the main ecological and environmental problems probably incurred in WLFZ are discussed, such as formation of contaminated belt along banks, appearance of epidemic...
The paper presents a fuzzy model analysis of environment power plant impact. The model, called symbolic “EFIM” uses as input data environmental indices. The fuzzy logic is used to provide measures leading to reduced environmental impact within the context of sustainable development. The components of the fuzzy model and its advantages are also presented in the paper.
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...
Along with the economy development and the industrialization progress quickly, watershed pollution in cities is growing seriously. It's difficult to achieve the goal of improving the water environment with the traditional water pollution control theory, as it's more emphasis on the end approach. Evolution of watershed relates to climate change, geological features, land use, animal changes, human...
As a unique natural region unit and the "buffer zone" which connects reservoirs and its peripheral region, the reservoir shore zone not only provides geographical space and resources-environmental supporting conditions for the local socio-economic development, but also plays a "barrier" role in maintaining reservoir ecosystem services function and protecting the environmental security...
Non-point source pollution is one of the major problems caused by agricultural activities especially from planting cultivation. This paper describes the application of the Soil and Water Assessment Tool (SWAT) model in agricultural non-point source pollution of the Laohahe River watershed, located in northeast China. This initial hydrologic modeling analysis will facilitate future applications of...
The AnnAGNPS model (Annualized Non-Point Source Pollution Model) is applied to analyze the spatial and temporal heterogeneity of agricultural non-point source pollutant loading in Zhangxi Watershed. The spatial database and attribute database of non-point source pollution is then established. Our result shows that in spatial scale, absorbed nitrogen has great spatial heterogeneity, while dissolved...
Trichloroethene (TCE), usually in the form of dense non-aqueous phase liquid (DNAPL), is a widely used degreasing ingredient causing profound soil and groundwater contamination. While bio-enhanced dechlorination of TCE to harmless Ethene is a promising technique for waste water treatment, the mechanism and related phenomenon have not been thoroughly understood, especially in groundwater. A comprehensive...
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...
A good numerical non-point source pollution model is an efficient tool for non-point source pollution management, which can be used to analyze the temporal and spatial rules of pollutant discharge. In this paper, SWAT model is adopted to estimate the contribution of non-point source pollution in the Xiangxi River watershed of Three Gorges Reservoir Area in China in 2002-2007a. With the predicted values...
The purpose of this document is to communicate an economic vision for Urban Economics. Solving the environmental problems associated with urbanization requires lateral thinking, or rather vertical thinking. Problems abound when considering the environmental challenges of an increasingly urban society. Among these are a decreasing vegetation cover of the soil, water absorption capacity, shade and temperature...
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...
The extensive clayization of Dexing copper mine is responsible for water and soil pollutions because of the oxidation of sulfide minerals. During the clayization, harmful elements such as As, S, Sb and Pb could be effectively released into the clay and water. Using the abundant spectral information of short wave infrared (SWIR), combining with the spectral absorbed index, SAM (Spectrum Angle Mapper)...
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