辽河大伙房水库汇水区农业非点源污染入库模拟

利用输出系数法和SWAT模型,对大伙房水库汇水区农业非点源污染(ANSP)进行了入库模拟研究,并用2006—2009年的水文和水质监测数据对模型进行了校准和验证。研究结果表明:汇水区年均输入到水库的泥沙量、总氮和总磷负荷分别为82.65×103 t、1 873.49t和81.97t;月入库泥沙量、总氮和总磷负荷与径流量有着较强的相关性,ANSP的产生和迁移受降水、径流过程影响很大,每年7、8月份的氮、磷和泥沙流失量达到年内最大值,分别占全年流失总量的42.64%、44.42%和67.91%。水库汇水区各流域对水库氮、磷污染的贡献率由大到小依次为:浑河流域(清原段)、苏子河流域、社河流域和水库周边小流域。

Simulation on the Inflow of Agricultural Non-Point Sources Pollution in Dahuofang Reservoir Catchment of Liao River

This study was to simulate the agricultural non-point source pollution(ANSP) input of Dahuofang reservoir catchment area in Liaoning Province in China based on export coefficient method and SWAT model,and the simulation model was calibrated and verified by the monitoring data of hydrology and water quality from 2006 to 2009.The results of model evaluation showed that the annual load of sediment,total nitrogen and total phosphorus was 82.65×103 t,1 873.49 t and 81.97 t.Besides,the monthly amount of the load was strongly relevant with runoff.The generation and migration of ANSP was substantially influenced by the rainfall and runoff.The loss of sediment,nitrogen and phosphorus was up to the maximum in July and August each year,accounting for 67.91%,42.64% and 44.42% of the annual loss amount respectively.The contribution rate of nitrogen and phosphorus pollution caused by the reservoir catchment area as Hun River,Suzi River,She River and small rivers was descending.