| Abstract Submission No. | ABS-2.3-0053 |
| Title of Abstract | Application of fuzzy logic to integrate hydrogeochemical indicators for assessing seawater intrusion in the coastal region of Mangaluru, Karnataka, India |
| Authors | Thabrez M*, Elango L, Parimalarenganayaki S |
| Organisation | Indian Institute of technology Madras |
| Address | HOUSE NUMBER 43 B MOSQUE ROAD MANDIKAL MANDIKALLU, Karnataka, India Pincode: 562104 E-mail: thabrezibnmdh@yahoo.com |
| Country | India |
| Presentation | Oral |
| Abstract | Seawater intrusion is a global issue affecting groundwater quality in coastal aquifers, primarily due to over-extraction of groundwater associated with rapid urban development. This study investigates the potential for seawater intrusion in the coastal region of Mangaluru city, Karnataka, located along India¿s western coastline. The study area was divided into six zones, extending from the coast inland, and 70 groundwater samples were collected during both pre-monsoon and post-monsoon periods. Seawater intrusion was evaluated using hydrochemical approaches, including ionic ratios, index methods, and graphical analyses. Modified Piper diagrams indicated a dominance of freshwater (Ca-HCO3 type) in inland zones and slight intrusion (Na-Cl type) in areas near the coast. Ionic ratio analyses (Na/Cl, Ca/Mg, Ca/(HCO3 + SO3), and Cl/(HCO3+ CO3)), BEX index results, and graphical methods such as EC v/s Cl plots, hydrochemical facies evaluation diagrams, suggest that salinization from seawater intrusion extends up to 2 km inland. To integrate findings from all methods, a fuzzy logic approach was applied, providing a comprehensive assessment of intrusion patterns. The results offer valuable insights to support decision-making for sustainable coastal groundwater management. |
| Keywords | seawater intrusion, mangaluru, hydrogeochemical signatures, fuzzy logic, hydrochemical facies evaluation |