A study of shallow groundwater quality distribution in the Ordos Cretaceous Artisan Basin based on GIS

Water quality evaluation and distribution regulation analysis of groundwater in the Ordos Cretaceous Artisan Basin are of important theoretical significance and social values since they may act as scientific guidance for groundwater resources development and groundwater pollution protection.Based on the Groundwater Quality Standard and water resources present in study area,this paper establishes an evaluation indexes system and modifies the unreasonable threshold values of some evaluation indexes.The Fuzzy synthetic evaluation model is used to evaluate shallow groundwater quality.With the platform of GIS,the distribution regulation of groundwater quality is studied.Results indicate that the indexes of total hardness,sulfate,total dissolved solids and chloride are the main factors affecting the groundwater quality.The shallow groundwater quality is quite well.The groundwater quality in most parts of the area is better than the IV grade which is good enough to serve as domestic and productive water supply in the basin.