基于SWAT模型的农业面源污染尺度效应研究

发布时间：2018-03-10 06:24

本文选题：SWAT模型　切入点：土地利用　出处：《中国农村水利水电》2016年09期 　论文类型：期刊论文

【摘要】：基于SWAT模型建立适用于莲塘口流域的面源污染分布式模型,以子流域嵌套方式从上游至下游构建7个尺度,模拟分析了现状条件及不同情景下总氮、总磷排放负荷随尺度的变化规律。结果表明:随着尺度的增大,单位面积总氮、总磷排放负荷总体呈现逐渐增大的变化规律。原因是稻田是整个研究区域流失氮、磷的主要来源,尺度增大后稻田面积占比增加。当稻田面积比相同时,氮磷排放负荷随尺度的增大而减小,原因是随尺度的增大排水被重复利用以及氮磷被净化使浓度减少。不同水文年型及不同施肥制度下的模拟结果有着相同的尺度变化特征,而且同一尺度上枯水年氮磷排放负荷最少,随施肥量减少氮磷排放负荷减少。
[Abstract]:Based on SWAT model, a distributed model of non-point source pollution was established for Liantangkou watershed. Seven scales were constructed by nested subbasin from upstream to downstream. The present situation conditions and total nitrogen under different scenarios were simulated and analyzed. The results showed that with the increase of the scale, the total nitrogen per unit area and the total phosphorus emission load increased gradually. The reason was that the paddy field was the whole area of study where nitrogen was lost. The main source of phosphorus, the proportion of rice field area increases after the scale increases. When the rice field area ratio is the same, the nitrogen and phosphorus emission load decreases with the increase of the scale. The reason is that the drainage is reused with the increase of scale and the concentration of nitrogen and phosphorus is reduced by purification. The simulation results of different hydrological years and different fertilization systems have the same scale variation characteristics. In the same scale, the annual nitrogen and phosphorus emission load of dry water was the least, and the nitrogen and phosphorus emission load decreased with the decrease of fertilizer application.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;浙江省水利河口研究院;广州丰泽源水利科技有限公司;
【基金】：高等学校博士点基金项目(20130141110014) 水利部公益性项目(201301012) 国家自然科学基金项目(51579184)
【分类号】：X71

【相似文献】