Fuzzy integrated evaluation of groundwater quality in the Cretaceous Ordos artisan basin based on GIS

Scientific and rational groundwater quality evaluation has great theoretical significance and social values because it can provide scientific guidance on the sustainable exploitation and utilization of groundwater resources and protection of groundwater pollution. With the groundwater quality standard as the basis, an scientific and rational evaluation index system of groundwater quality has been built and with the platform of GIS, the fuzzy integrated evaluation method has been used to evaluate the groundwater quality in the study area. The results of evaluation indicate that the groundwater quality is generally good in the northern part of the basin and that the groundwater quality does not vary much at different depths. However, the groundwater quality in the southern part of the basin is generally poor as compared with the northern part and the quality is mainly of grades IV and V.