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Tamil Nadu Agricultural University (2016)

Assessment of hydrological factors and development of groundwater model using remote sensing and geographic information system in amaravathi basin

Thangamani S

Titre : Assessment of hydrological factors and development of groundwater model using remote sensing and geographic information system in amaravathi basin

Auteur : Thangamani S

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Soil and Water Engineering 2016

Résumé partiel
Increasing groundwater use has resulted in depleted aquifers in many areas of Tamil Nadu. Tamil Nadu is underlain by geological formation ranging from Archean to recent age and nearly 73 per cent of the geographical area of the state is occupied by a variety of hard and fissured crystalline rock formations of the Archean age like Charnockite, gneisses, granites and associated rocks. Groundwater has emerged as the major source to meet the ever increasing demands of irrigation, industrial and domestic sectors in Tamil Nadu and alarming levels of groundwater abstraction has resulted in the declining of water table rapidly in many parts of the basin. Amaravathi basin is one of the sub basin of Cauvery basin having the same level of groundwater abstraction and decline in groundwater table. The average annual rainfall of the basin is 978.8 mm and the contribution of rainfall during winter, summer, south west monsoon and north east monsoon were 1.8, 15, 42 and 39 per cent respectively. The rainfall analysis confirmed that there is a wide variation of rainfall over years, both spatially and temporally. Increasing pattern of rainfall was observed from north side to south side of the basin and significant increasing trend at a rate of 0.186 mm/year was observed during winter seasons with 95 per cent of level of confidence (α = 0.05). Decreasing trend at the rate of 3.045 mm/ year was observed in southwest monsoon with 0.1 per cent of level of significance. The average value of coefficient of variation of rainfall in Amaravathi basin is 32.13 per cent, which comes under highly variable category. Groundwater level fluctuation in the basin varied from 0.2 to 3.1 m due to south west monsoon, while it was from 0.4 to 6.6 m in north east monsoon. The total monsoon recharge varied from 1.27 per cent to 12.80 per cent with an average of 4.01 per cent in Amaravathi basin. Groundwater development in the basin revealed that, out of the 33 blocks in the basin, sixteen blocks fell in the category of over exploited category, two blocks under critical category, twelve blocks under semi critical category and only three blocks were in safe category. Nilakottai block recorded the highest irrigation draft of 79.29 Mcum, while Attur block toped the table with the highest groundwater development percentage of 192 per cent, as the net availability of groundwater (36.99 Mcum) was far below the total draft utilized for the domestic (2.70 Mcum) and irrigation (67.42 Mcum)

Présentation et version intégrale (Shodhganga)

Page publiée le 18 avril 2021