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| DOI： |
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| Impact of the Ponds Regulation for the Nitrogen Discharge of Irrigation Area under the Future Climate Change |
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WU Di, CUI Yuanlai
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State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
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| Abstract: |
| A distributed hydrological model based on SWAT2009 was constructed for Yangshudang basin in Zhanghe Irrigation Area. The model was used to simulate the water balance and non-point source pollution, and the impacts of future climate change on the nitrogen discharge in this region. Furthermore, the regulatory effect on nitrogen discharge was simulated by increasing the pond area in this region. The results showed that the nitrogen discharge in this region was significantly increased under the future climate scenarios. Whereas, by increasing the pond area in this region under the future climate scenarios, the runoff could be greatly cut down, and the nitrogen discharge could be kept as the same to present situation or even less. By increasing the pond area in the irrigation area would be a valid way to control the nitrogen discharge under future climate scenarios. According to the decreasing rate of the nitrogen discharge from paddy rice field or basin outlet under the future climate scenarios by increasing the pond area, in order to ensure the nitrogen discharge same to present, increasing the pond area by 30% would be reasonable for Zhanghe Irrigation Area. |
| Key words: non-point source pollution; SWAT model; climate change; nitrogen; pond |
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