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Study on the Non-point Source Pollution of Zhuganhe Watershed

Author: LiuMingHuan
Tutor: ZhangSiCong
School: Tsinghua University
Course: Hydraulic Engineering
Keywords: Non-point source pollution SWAT model Bamboo river basin Parameter calibration Model validation
CLC: X522
Type: Master's thesis
Year: 2005
Downloads: 458
Quote: 11
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Abstract


Non-point source pollution refers to the solubility or solid contaminants over a large area under the action of rainfall and runoff erosion import the receiving water body caused by water pollution. The main work of this paper is to select the Huaihe River basin as a typical mountain bamboo type of non-point source pollution simulation, analysis of the Huaihe River basin-type non-point source pollution production output characteristics as non-point source pollution in the Huaihe River Basin is an important research research results. Bamboo in the Huaihe River basin upstream of Hubei and Henan Province, the basin area 1672 km2. Study by the United States Department of Agriculture Agricultural Research Service (ARS) developed SWAT model for non-point source pollution simulation, SWAT model is a continuous-time distributed model that can predict the complex changes in the basin underlying surface conditions, land use patterns and different management measures on watershed runoff, sediment yield and non-point source pollutants production output of long-term effects. Model simulations need to collect and collate graphics, meteorology, soil properties, and manage large amounts of data such measures, the first use of GIS software to a variety of graphics file into the same projected coordinate systems, meteorological and other data will be organized into the format required by SWAT model. Then through the SWAT Automatic Terrain Analysis Package (TOPAZ) DEM generated by the river basin, sub-basin divide, and calculate the sub-basin and river terrain parameters, by superimposing land use map and soil type map to get the smallest calculation unit SWAT Hydrological Response Units ( HRU). Use of the 1996 Hydrometric Station bamboo shop runoff and sediment data parameter adjustment of the model, in which the model pollutant parameters for use in June 2004 a rainfall runoff process measured data was calibrated and applied bamboo shop Section 1998 measured data as well as monthly runoff and sediment runoff 1991-2000 measured values ??of the model validation, with the relative error and Nash-Sutcliffe simulation coefficients determine model parameters and calibration verification results are reasonable, results show that SWAT bamboo river basin model for non-point source pollution has good applicability. Verify a good model for the use of bamboo river basin series 1991-2000 simulation, analysis bamboo river basin non-point source pollutant output time distribution characteristics and spatial distribution characteristics to explore land use, soil type and fertilization on non-point the impact of pollutant outputs, as well as the process of continuous heavy rain at the basin outlet types of non-point source pollutant concentration during the process of change and flow relationships. And calculated according to the model results and the experience at home and abroad, put forward the control of non-point source pollution prevention and control measures.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > River
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