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Anna University (2014)

Managed aquifer recharge an integrated approach for assessing the impact of a check dam

Parimala Renganayaki S

Titre : Managed aquifer recharge an integrated approach for assessing the impact of a check dam

Auteur : Parimala Renganayaki S

Université de soutenance : Anna University

Grade : Doctor of Philosophy (PhD) 2014

Résumé

Ever increasing demand for water has led to over exploitation of groundwater in several regions. Managed Aquifer recharge (MAR), which is a deliberate method to increase the groundwater storage, need to be practiced in aquifers that are over stressed. Check dam constructed across the rivers is one of the methods of MAR. In arid or semi arid regions the rivers flow only for a few days in a year (non perennial rivers) during the monsoon. The average rainfall is generally non uniform and most part of it falls in a relatively short period of time. Hence, large quantum of this rainfall reaches the sea as runoff and also results in flooding during peak monsoonal rains. In such a region, MAR by the check dams will help in harvesting this surface runoff, by increasing the contact time between the water and the river bed to facilitate the infiltration. This improves the groundwater recharge and reduces the runoff into the sea. Though there were many methods to assess the efficiency of MAR, each method had given results in various perspectives. Hence, the present study was carried out to accurately assess the impact of MAR on groundwater potential by an integrated study comprising hydrological, hydrogeological, microbiological, groundwater modeling and socio economic studies in Chennai, Tamil Nadu, India. For this purpose, primary data were generated through field investigation, laboratory work and secondary data required for this study were collected from government and private agencies. Field investigations were carried out from July 2010 to December 2013 which includes topographical survey, subsurface investigations, periodical groundwater level measurement, daily water level measurement from check iv dam, periodical water sampling from check dam and wells and socio economic survey. Immediately after water sampling electrical conductivity, pH and alkalinity were measured. Laboratory work includes soil, water analysis and groundwater modeling. Secondary data includes collection of topographic sheet, meteorological data, groundwater level data and hydraulic particulars of the check dam. Thematic maps were prepared based on the secondary data.

Présentation et version intégrale de la thèse (Shodhganga)

Page publiée le 26 janvier 2016