流域非点源氮磷污染负荷分布模拟

Distribution simulation of non-point source nitrogen and phosphorus pollution load in watershed

为揭示流域非点源氮磷流失时空分布规律,基于实测水文水质数据,采用SWAT模型与SUFI2算法,以滦河潘家口水库流域为研究对象,模拟了不同水平年下流域非点源氮磷流失变化情况。结果表明:丰水年的TN负荷是平水年的1.68倍,是枯水年的2.12倍;TP负荷是平水年的1.52倍,是枯水年的2.21倍。从空间上看,TN、TP负荷量从大到小排序依次为耕地、林地、草地、荒地。相关性分析发现,泥沙产出量是非点源污染负荷空间分布的重要驱动因子。

To reveal the temporal and spatial distribution of non-point source nitrogen and phosphorus loss in the Luanhe River Basin above the Panjiakou reservoir,this study selected the Panjiakou Reservoir basin as the research watershed,adopted the SWAT model and SUFI-2 algorithm,and simulated the change of non-point source nitrogen and phosphorus loss in different hydrological years,based on the measured hydrological and water quality data.The results show that the total nitrogen load in a wet year is 1.68 times of that in a normal year,and 2.12 times of that in a dry year.Meanwhile,the total phosphorus load in a wet year is 1.52 times of that in a normal water year and 2.21 times of that in a dry year.In spatial distribution,the descending order of total nitrogen and phosphorus emissions is cultivated land,forest land,grassland,and wasteland.Further analysis of the correlation reveals that the sediment production is an important driving factor of the spatial distribution of pollution load for the non-point source pollution.