AnnAGNPS模型数据库的建立及径流模拟应用——以桃江流域农业区为例

AnnAGNPS模型可以连续模拟和预测来自流域的地表径流、沉积物、污染负荷。借助GIS平台及1stOp(tFirst Optimization)工具,以桃江小流域农业区为例,详述了AnnAGNPS模型数据库(包括土壤、土地利用、地形、气象、作物管理、径流曲线等)相关参数的提取和确定过程;并基于已建立的数据库对桃江流域农业区的径流进行了模拟和适用性评价,采用的3个评价指标(相对误差Re<10%,效率系数Ens≥0.9,相关系数R2>0.9)均达到较高精度要求,表明AnnAGNPS模型适用于桃江流域研究区的径流模拟,反映了数据库建立的正确性。

Database Construction for AnnAGNPS Model and Its Application in Runoff Simulation:Case Study of Agricultural Area in Tao River Basin

AnnAGNPS(annualized agricultural non-point source pollution model)is a tool developed by USDA-ARS and NRCS to continuously simulate and predict runoff,sediment and pollution load in a water shed.Based on technology of GIS and 1stOpt(first optimization),database for AnnAGNPS model was constructed,and extraction and determination process of some parameters including soil,land use,topography,weather,crop management,curve number were introduced.Based on the established database,applicability of AnnAGNPS model in agricultural areas of Tao River basin was simulated and evaluated.The evaluation indicators with high accuracy showed that AnnAGNPS model can be used to simulate runoff in this area,reflecting the established database was active.