Volume 17, No. 3, 2023
Received: 2022/06/29, Accepted: 2022/12/28
Authors:
Rajaveni Sundara Pandian; Muniappan Nagaraj;
Abstract:
The current study was carried out in the Nambiyar river basin in Tamil Nadu's Southeast coastal area, where groundwater is in critical condition. To improve groundwater recharge, it is critical to identify possible groundwater recharge areas. As a result, the current research employs integrated remote sensing, geographic information systems (GIS), and multi-criteria decision-making approaches of analytical hierarchical process methodologies (AHP). Slope, curvature, soil, roughness, topographic wetness index, drainage density, land use/land cover, geology, geomorphology, lineament density and rainfall were generated for analysing groundwater potential zone. All thematic maps are weighted using AHP based on the attributes of the classes and the potential capacity of their water supply. By comparing pre- and post-monsoon groundwater levels in the region, the precision of the result was validated. The groundwater potential zone map that resulted was classified into five categories: very high, high, moderate, low, and very low. According to the data, the moderate groundwater potential zone encompasses around 64% of the river basin. Low and high groundwater potential zones may be detected in 22% and 14% of the instances, respectively.
Keywords:
GIS, Recharge areas, Groundwater potential, Nambiyar river basin, AHP