Morphometric analysis for geohydrological studies of upper amaravathi basin using geo spatial technology

Thirumurugan V, Thirukumaran V, Sridharan V and Manivannan V

Morphometric analysis of the Upper Amaravathi drainage basin is attempted in understanding the role of channel network on the geo-hydrological behaviour of the river basin. The study also expresses geology, geomorphology and structural characters of the catchment. Morphometric analysis of a drainage basin expresses the dynamic balance attained by the interaction of energy and elements of the system. Geographical Information System (GIS) techniques are used to assess the geo-hydrological characteristics of the Upper Amaravathi Drainage Basin and an attempt is made to study the ground water potential zones through geo-morphometric data. The morphometric parameters of the basin are studied on the linear, areal and relief aspects. The drainage pattern of the basin is sub-dendritic in the planar regions and dendritic in the mountainous part of the basin. Geology, rainfall and groundwater development of the region are governed by the drainage pattern of the basin. The study has revealed that the III order stream has the maximum stream length with the complex geo structural character of the basin. The bifurcation ratio (Rb ) also varies between different successive stream orders conforming geo structural control of the basin. The shape parameters (Rf = 0.38, Re = 0.19, Rc = 0.37 ) along with the areal parameters of drainage density and drainage texture combined with the relief characters like Basin relief and basin slope inform an elongated basin shape with a low seasonal runoff with a generally permeable weathered rocky terrain conditions with a moderate infiltration capacity that aids in good ground water conditions.

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