DRASTIC评价模型在台州市浅层地下水脆弱性评价中的应用

Application of DRASTIC model to groundwater vulnerability assessment in Taizhou plain area

本文介绍了DRASTIC评价体系在台州市浅层地下水的脆弱性评价中的应用。根据台州市的地质背景、水文地质条件等,对DRASTIC评价指标进行改进,选择了地下水埋深等4个参数作为研究区地下水脆弱性评价因子,建立了台州市浅层地下水脆弱性评价模型。结合G IS技术对该地区的地下水脆弱性进行了评价,编制了地下水脆弱性评价图。综合评价的结果表明改进的DScTI评价模型能合理的反映台州市浅层地下水环境脆弱性的高低。

This paper presents the concepts of the DRASTIC index in brief and applies it in assessing the groundwater vulnerability to pollution in Taizhou plain area. Depth to groundwater and other three parameters are selected to assess groundwater vulnerability in Taizhou plain area according to the specific geological conditions of this area. Numeric modeling and the weighting system are obtained by the analysis of the outcome of the date from the area and the DRASTIC index. Thus the assessing model of the groundwater vulnerability in Taizhou plain area is established. Based on the established assessment system and GIS technique,groundwater vulnerability assessment is conducted in this area and a groundwater vulnerability distribution map is drawn which is a useful tool for groundwater protection. The assessment results express the improved DScTI appraisal model can reflect the highness and lowliness the groundwater vulnerability to pollution in Taizhou plain area.