过程模拟法及其在唐山平原区地下水脆弱性评价中的应用

Process simulation method and its application to assessment of groundwater vulnerability in Tangshan plain area

地下水脆弱性研究是近年来水文地质领域新兴的一个研究方向,也是当前研究的热点问题之一。本文应用过程模拟法,应用GIS技术,通过包气带岩性、土地利用、地下水埋深、土壤类型、肥料使用等8个基本条件,应用过程模拟模型LEACHM和MODFLOW与Monte-Carlo随机模拟相结合的方法,对包气带和饱和带进行联合的模拟,建立了基于过程模拟的唐山平原区地下水脆弱性评价系统,进行了地下水硝酸盐脆弱性的评价,最后利用实测的硝酸盐氮浓度进行了校核,取得了比较符合实际的评价成果。

Study on groundwater vulnerability is now the new orientation in hydrogeology. It is also one of the hottest topics in the study field. In this article the process simulation method is used to assess the groundwater vulnerability by using GIS technology. Based on these eight basic conditions such as lithology of vadose, landuse, groundwater table, soil type, fertilizer use, the groundwater vulnerability assessment system is built up by using the process simulation models of LEACHM and MODFLOW coupled with Monte-Carlo method. During groundwater vulnerability assessment, vadose and saturated zone are coupled for simulation. Finally, the groundwater vulnerability of nitrate in Tangshan plain area is assessed. By using these measured data of nitrate concentration in this area, the assessment results are checked and the reasonable results are obtained.