Application of DRASTIC Model based on Entropy Weight to the Assessment on Vulnerability of Groundwater in Weining Plain

Abstract

Given the weight in groundwater vulnerability assessment, entropy weight combined with DRASTIC model is considered to assess the groundwater vulnerability. The assessment index weight is assessed by entropy weight and the model is ultimately applied to the assessment on the vulnerability of the groundwater in Weining Plain of Ningxia Hui Autonomous Region. Firstly, based on the seven assessment index attribute partition charts, the assessment index weight is calculated by entropy weight; then, by the ARCGIS grid image overlay tool to overlay the seven index grid images, the composite index chart of the assessment on the vulnerability of the groundwater in the study area is developed; finally, according to the classification standard, a partition chart of the assessment on the vulnerability of the groundwater in the study area is made to carry out the result analysis of the assessment on the vulnerability of the groundwater in the study area. The comprehensive assessment results indicate that the application of entropy weight to the DRASTIC model is feasible and the assessment results are more objective and direct.