Recharge area identification using GIS based approach for effective springshed management in Western Himalaya
摘要
Springs are essential water sources in the Indian Himalayan region, particularly in rural and mountainous areas where they often serve as the primary water supply. However, increasing anthropogenic pressures and climate change have led to the depletion and drying up of many springs. This study aims to develop effective intervention strategies for spring restoration and sustainable management through geospatial analysis and hydrogeological mapping in the Upper Kosi River Basin, Uttarakhand. The study delineated groundwater potential zones by integrating eight key parameters: lineament density, lithology geomorphology, land use/land cover, rainfall, drainage density, slope, and soil type. These parameters were selected based on prior studies to reflect the major hydrogeological controls of the Himalayan terrain. The analytic hierarchy process was used to assign weights to each parameter based on their relative importance in influencing groundwater potential. The resulting map identified five groundwater potential classes: very good (12.8%), good (33.5%), moderate (39.4%), poor (13.36%), and very poor (0.73%). Validation using spring location data showed a high predictive accuracy of 76.1% through ROC curve analysis. Hydrogeological mapping, including rock orientation and fracture patterns, helped identify recharge areas for springs. By overlaying the groundwater potential map with recharge zones, priority regions for in-situ interventions were identified. These insights support measures such as afforestation, soil moisture conservation, and controlled land-use practices to enhance recharge and ensure spring sustainability. This approach can be applied to other Himalayan basins, offering policymakers and communities an affordable, science-based method for groundwater mapping and targeted intervention.