基于ArcMap的长期水文影响评价模型二次开发

长期水文影响评价模型(Long-term Hydrological Impact Assessment,L-THIA)是研究人类活动对流域非点源影响的重要评价模型之一。本文深入阐明了L-THIA模型的原理,探讨了SCS CN方法和污染物负荷的具体计算方法。在此基础上,提出了L-THIA模型存在的不足和改进方向,并以ArcMap为平台,对该模型进行了二次开发,二次开发后的模型主要包括六个模块,分别为土地利用分类模块、土壤分类模块、CN值计算模块、径流深度计算模块、径流量计算模块和污染物负荷计算模块。基于ArcMap平台的L-THIA模型利于用户方便处理数据,且提高了模型模拟的准确度,实现了模型本地化。

The Re-development of Long-term Hydrological Impact Model using ArcMap

Long-term Hydrological Impact Assessment(L-THA) model is one of the important non-point models to study the impacts of human activities on non-point source in watersheds.In this study,we elaborate the theory of L-THIA model,investigate the methods of SCS CN and pollutant loads.On this basis,we put forward the shortage of model and the improvement and then re-develop and improve this model using ArcMap.The re-developed model consists of six modules,including the module of land use classification,the module of soil classification,the module of calculating CN,the module of calculating runoff depth,the module of calculating runoff volume and the module of calculating the load of pollution.The L-THIA model of using ArcMap can be more convenient in the processing of data,improve the accuracy,and achieve the purpose of model of localized.