Fig. 2

(a) Infiltration coefficient map of phreatic aquifer, and (b) the land use within the study area along with the groundwater sampling sites in various SOM clusters. The map was created via ArcGIS 10.2 (https://www.esri.com/en-us/arcgis/products/arcgis-desktop/resources) based on (a) the data from field hydrogeological survey in present research and (b) the GlobeLand30 data from National Catalogue Service For Geographic Information (https://www.webmap.cn/commres.do? method=globeIndex).