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Karunya University (2019)

Groundwater Recharge study using Environmental Stable Isotopes and Water Quality Assessment in Selected Semi Arid Zones of Tamil Nadu India

Babithesh Babu. N.K

Titre : Groundwater Recharge study using Environmental Stable Isotopes and Water Quality Assessment in Selected Semi Arid Zones of Tamil Nadu India

Auteur : Babithesh Babu. N.K

Université de soutenance : Karunya University

Grade : Doctor of Philosophy (PhD) 2019

Résumé partiel
The problems related to groundwater quality and quantity has great importance in present context, especially in the arid and semi-arid zones. This thesis presents the results of isotopic and hydrochemical studies conducted in the semi-arid zones of Tamil Nadu, India. Two locations were selected for the present study : (1) the area surrounding the three selected tanks in Nambiyar river basin of Tirunelveli district, and (2) the area surrounding the two tanks in Sulur taluk of Coimbatore district. This work aims at using the environmental stable isotopes in water to understand the groundwater recharge characteristics due to tanks as well as to assess the groundwater quality status. Oxygen and hydrogen stable isotope ratios and physicochemical parameters were estimated, total dissolved solids, pH, electrical conductivity, calcium, magnesium, total hardness, fluoride, nitrate, sulfate, chloride, bicarbonate, potassium and sodium were analysed. The plot of δD values against δ18O values show that the groundwater and tank water falls below both the Global Meteoric Water Line (GMWL) and Indian Meteoric Water Line (IMWL), implying evaporation effect. Influence of the tanks in Nambiyar basin on groundwater sources in the region was examined and groundwater recharge due to the tanks was evaluated. To quantitatively estimate the groundwater-tank water interaction, the isotope mass balance equation was used. From the result of isotope studies, it is concluded that 50% of the groundwater in the study areas are derived from the tanks. The groundwater in Subisesapuram of Nambiyar basin is estimated to have 61% of tank water. However, tank water contribution in the samples of groundwater from Anaikudy of Nambiyar basin is only 56%. Five out of ten groundwater samples from Sulur region were found to have similar isotopic values as that of tanks and are plotted very close to the tank water, implying that these wells are predominantly recharged from the tanks. It is observed that the influence of the tank was up to a distance of 1920m towards north in the zone of influence of the tank.

Présentation et version intégrale (Shodhganga)

Page publiée le 27 février 2021