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基于SWAT模型的植草河道对非点源污染控制效果的模拟研究

Journal of Agro-Environment Science(2014)

Cited 6|Views5
Abstract
以三峡库区香溪河流域为研究区,基于SWAT模型,通过收集整理香溪河流域2011年DEM、土壤、土地利用数据和1970-2011年的气象数据,在模型得到满意的率定和验证的基础上,模拟分析了流域内农业非点源污染的空间分布特征,评价了植草河道措施对于农业非点源污染的削减效果。模拟结果表明,SWAT模型能够较好地模拟研究区非点源污染,研究区TN和TP污染负荷集中分布在南阳水系,以及古夫、高岚水系的下游区域。全流域TN和TP污染总负荷分别高达1388 t和239 t。实施植草河道措施之后,TN和TP污染负荷分别降到1120 t和157 t,共削减了16.7%的TN负荷和34%的TP负荷。因此,从控制效果来看,植草河道能够很好地控制三峡库区香溪河流域的农业非点源污染,尤其是对TP污染控制效果更加明显。
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Key words
non-point source pollution,vegetated waterway,SWAT model,best management practices
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要点】:本研究使用SWAT模型评估了植被水道在减轻三峡库区香溪河流域农业非点源污染中的有效性,发现植被水道能显著降低总氮和总磷污染负荷。

方法】:研究采用SWAT模型,输入DEM、土壤数据、2011年土地利用数据以及1970年至2011年的气象数据,模拟了实施植被水道管理前后总氮(TN)和总磷(TP)的污染负荷。

实验】:通过Jenks最优方法将污染负荷分为五类,实验结果显示,实施植被水道管理后,TN和TP的污染负荷分别降至1120吨和157吨,较之前分别降低了16.7%和34%。使用的数据集包括DEM、土壤数据、2011年土地利用数据和1970年至2011年气象数据。