Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Inde → 1990- 1999 → Geohydrology of Aurepalle watershed in Semi arid India

Karnatak University (1991)

Geohydrology of Aurepalle watershed in Semi arid India

Muralidharan, D

Titre : Geohydrology of Aurepalle watershed in Semi arid India

Auteur : Muralidharan, D

Université de soutenance : Karnatak University

Grade : Doctor of Philosophy (PhD) in Geology 1991

Sommaire partiel
A summary of the geohydrological work done in the Aurepalle Watershed located m SAT region of Peninsular India is presented The integrated study results through geological, geomorohological, hydrogeological, geophysical and the two dimensional aquifer modeling have helped in understanding the aquifer proper !les and m assessing the ground water replenishment, use and potential. The geological and structural studies show existence of minor and major faults m the study area. Most of the faults have a general trend of NW-SE trend. Shearing of granite near these faults may increase the percolation process when the area is under soil cover. Numerous basic intrusives mapped over the study area are also oriented m the same trend of the faults suggesting that tectonic forces were oriented, m general, along NW-SE direction The major drainage streams are also oriented in the same directional trend indicating the structural influence on the watershed hydrogeology. The pediment area in SE part of the watershed was demarcated through aerial photographical and geomorphological ground studies. Resistivity surveys indicate that the weathered zone has the maximum thickness and therefore has a better ground water potential as compared to the other areas. The aerial photo studies identified numerous lineaments, mostly oriented along NW-SE and E-W directions. Some of the major lineaments are found to be good ground water potential zones in the watershed. Of the nine exploratory borewells drilled, the two borewells at Irvin (S-86) and Singampal1l-Irvin cross road (S-43) located close to the lineaments have given the maximum yields of 36,400 8 11,360 LPH respectively. This data suggests tnat future exploratory/production wells should perferably located near the major lineaments shown m Fig.2.5. Monitoring of the rainfall at different stations m the watershed indicates considerable spatial variations m the total rainfall over the watershed. The long term average annua- rainfall is 618.8 mm. It is observed that storm events form major components of the total annual rainfall. The run-off forms 5 to 6% of the total rainfall over the watershed. The evaporational loss from the ponded water in the 11 tanks in the watershed is about 4 to 6 mm/day. Rest of the rainfall over the watershed goes as stream run-off.

Présentation et version intégrale (Shodhganga)

Page publiée le 4 avril 2021