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| DOI： |
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| Simulating Non-point Source Pollution in Fen River Basin |
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ZHANG Xuehui, XU Mingde, CHAI Guoping, ZHENG Tingting, LI Jing
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College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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| Abstract: |
| Taking Fen River basin as an example, we calibrated and validated the soil and water assessment tool (SWAT) model using measured data. We then used it to simulate the runoff, sediment, nitrogen and phosphorus loads from 2000 to 2010 in attempts to understand the spatio-temporal distribution of non-point source pollution and identify the critical polluted regions. The results showed that the nitrogen and phosphorus loads in wet years were 139.34 and 0.92 kg/hm2 respectively, which were 1.2 and 1.5 times the levels in normal years and 1.3 and 2.0 times the level in dry years. The nitrogen and phosphorus loads peaked in the flood season (from June to October), accounting for 68.81% and 68.53% of the annual loads. The temporal change of non-point source pollution depends on rainfall. Discharge rates of organic nitrogen, nitrate nitrogen, organic phosphorus and nitrate phosphorus were 0.25~10.00, 1~270, 0.03~1.50, 0.002~0.25 kg/hm2, respectively. The spatial distribution of the pollutants varied widely, controlled by rainfall, slope, land use and soil types. The critical polluted regions are Lan country and Jingle county with the highest nitrogen and phosphorus loads. |
| Key words: Fenhe reservoir basin； non-point source pollution； spatial-temporal distribution |
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