Groundwater Potential Assessment in Gannan Region, China, Using the Soil and Water Assessment Tool Model and GIS-Based Analytical Hierarchical Process

The Gannan region is situated in Ganzhou City, Jiangxi Province, China, and has a complicated geological background. Seasonal droughts significantly jeopardize the water security of local population. Groundwater essential to alleviate region’s needs. In this research, groundwater potential (GWP) was assessed using Soil Water Assessment Tool (SWAT) Analytical Hierarchical Process (AHP). recharge rainfall estimated by SWAT model exhibited notable inconsistencies regarding their spatial distribution. Eight assessment factors (lithology, fault density, land use, slope, convergence index, drainage rainfall, recharge) were constructed integrating remote sensing, geological, output data. Two GWP maps an overlay analysis based on obtained weights AHP, with assigned same weight calculate other six separately. Each map split into five classes: excellent, good, moderate, poor, very poor. Data from 23 wells 42 springs collected validate two correlation between flow rates springs. result indicates that calculated (R2 = 0.8 0.74, respectively) more accurate than 0.21 0.48, can provide theoretical basis for management exploration area.