三峡库区大宁河流域AnnAGNPS模型参数评价

AnnAGNPS是一个基于连续事件、流域尺度的分布式农业非点源污染模型,用来模拟流域地表径流、泥沙与化学物质迁移,进而评价流域内农业管理措施对流域水文和水质的响应。构建完善的数据库是模型合理应用的前提条件,以位于长江三峡库区的大宁河沟流域为例,应用3S(GIS,RS和GPS)技术,结合实地调查,建立了AnnAGNPS模型数据库,评价了气候、地形、土壤、土地利用和作物等相关参数的确定,重点分析了模拟单元划分、土地利用数据库和土壤相关参数等因子,为大宁河流域侵蚀产沙和农业非点源污染模拟研究提供了基础数据平台,也为该模型在长江三峡库区的合理应用奠定了科学基础。

Evaluation for AnnAGNPS Model Parameters in Daning River Watershed of Three Gorges Reservoir Region

Annualized Agricultural Non-Point Source model(AnnAGNPS),a continuous-simulation,watershed-scale model,is widely used to evaluate non-point source pollution from agricultural watersheds in a number of countries.AnnAGNPS simulates surface water,sediment,nutrients,and pesticides leaving the cells and their transport through the watershed.The Daning river watershed was selected as the case study.Based on 3S(GIS,Remote Sensing,Global Position System) technology,the AnnAGNPS model database was set up in the watershed by analysis of rainfall characteristics,size of simulating cells,translation of soil relative parameters,characteristic of land use management,and so on.The parameters on climate,topography,soil,landuse,crop information and crop management were evaluated.This study was expected to provide a sound and credible basis for decisions to evaluate soil erosion,sediment and agricultural non-point source pollution in Daning river watershed and Three Gorges Reservoir Region.