基于AnnAGNPS模型的三峡库区小江流域非点源污染负荷评价

运用AnnAGNPS模型对三峡库区小江流域2002～2004年的径流量、输沙量、氮磷负荷量进行模拟估算，并分别采用宝塔窝水文站（控制范围占流域面积的62%）2002～2004年实测数据对径流和泥沙模拟值进行校准和验证，采用小江流域出口2002～2004年实测年均数据对总氮、总磷模拟负荷进行校准和验证，通过敏感性分析确定了影响流域非点源污染负荷输出的主要因子，结果表明模型模拟结果相对可靠，适合于三峡库区流域非点源污染负荷评价。根据模型预测结果，模型对径流输出的模拟精度高于对泥沙和养分的输出模拟，小江流域多年年均泥沙输出量为26189 万t，总氮输出为8 33523 t，总磷输出为43686 t。研究成果对于AnnAGNPS模型在三峡库区的应用具有很好的示范性

APPLYING ANNAGNPS TO ESTIMATE NON-POINT POLLUTION LOADING FROM XIAO JIANG BASIN IN THE THREE GORGES RESERVOIR REGION

AnnAGNPS was applied to estimate runoff,sediment yields,N and P loading from Xiao Jiang watershed in the Three Gorges reservoir region from 2002 to 2004.Time series data of the same time periods on runoff,sediment yields from Baotawo ge station(which covers an area of 62% of the whole catchment) and nutrient loading from the outlet of Xiao Jiang catchment were used to calibrate and validate output data.Main factors determining non-point pollution output were identified through sensitivity analysis.The result shows that the result of runoff simulation is more precise than sediment and nutrition loads simulation.Annual output of sediment from watershed outlet is 261.89×104 t,while annual loading of total nitrogen and total phosphorous are 8 335.23 t and 436.86 t,respectively.The results in this paper make a good demonstration for applying AnnAGNPS model in the Three Gorges Reservoir Region.