Abstract
An Indicator based model is described to assess and quantify the significance of vulnerability to seawater intrusion due to excessive ground water withdrawals: also to analyze the impact of artificial recharge in minimizing the seawater intrusion for coastal aquifers. Thematic maps of factors influencing the seawater intrusion and artificial recharge were prepared and overlaid using Geographical Information System (GIS). Based on GALDIT Index, the aquifer vulnerability index mapping was carried out. The distributions of the vulnerability areas for good, moderate and poor class are 32%, 45% and 23% respectively. These maps can be used as a tool for management of the coastal ground water resources. Further, the vulnerable areas are reclassified into two zones: good and poor potential areas (recharge zones). The influence of artificial recharge in pushing the freshwater-seawater interface towards the sea was simulated. For different options of surface water availability and artificial recharge, the possibility of remedial measures of seawater intrusion is estimated. Keywords: Aquifer vulnerability mapping, Sea water intrusion, GALDIT Index, Artificial recharge, GIS, Overlay
Highlights
Artificial recharge is one of the remedial measures to minimise seawater intrusion in coastal alluviums
Identification of favourable recharge zones and adapted site-specific artificial recharge techniques based on the hydrogeomorphic approach in Bhatsa and Kalu river basins is carried out using Geographical Information System (GIS) (Zade et al, 2005)
Southwest monsoon rainfall occurs from June to September and Northeast monsoon rainfall occurs during October to December
Summary
Artificial recharge is one of the remedial measures to minimise seawater intrusion in coastal alluviums Modern tools such as Geographical Information System (GIS) can be extensively used in ground water investigations and analysis for mapping purposes, based on the compiled database (vector or raster). GIS is used to delineate areas favorable for recharge both in hard rock and sedimentary environs and to recommend suitable recharge structures. The region is impounded with Bay of Bengal on the East, Ponnaiyar River in the South and Kaluvezhi Swamp in the North. Thick alluvial deposits are built up along the course of Ponnaiyar and Varahanadhi rivers covering three fourths of the region It occurs in the inter-stream area and in the North of Varahanadhi river in the area extending from Pondicherry town on the East to Usteri tank on the West. The terrain becomes a little undulating with prominent high grounds varying from 30 to 45 m above M.S.L towards interior Northwest and North-eastern part of the region
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
