Remote sensing and GIS based comparative morphometric study of two sub-watershed of different physiographic conditions,West Godavari District,A.P. |
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Authors: | G Tamma Rao V V S Gurunadha Rao Ratnakar Dakate S T Mallikharjuna Rao B M Raja Rao |
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Institution: | (1) Centre for Geotechnology, Manonmaniam Sundaranar University, Tirunelveli, 627012, Tamil Nadu, India |
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Abstract: | In this present study, Remote Sensing (RS) and Geographical Information System (GIS) techniques were used to update drainage
and surface water bodies and to evaluate linear, relief and aerial morphometric parameters of the two sub-watersheds viz.
Jilugumilli and Regulapadu in the northern part of West Godavari District, Andhra Pradesh. The area of Jilugumilli and Regulapadu
watersheds spread over about 110 & 80 sq. km respectively. The morphometric analysis of the drainage networks of Regulapadu
and Jilugumilli sub-watersheds exhibit sub-dendritic and sub parallel drainage pattern. The variation in stream length ratio
changes due to change in slope and topography. It was inferred from the study that the streams are in a mature stage in Regulapadu
and Jilugumilli watersheds, which indicated the geomorphic development. The variations in bifurcation ratio values among the
sub-watersheds are described with respect to topography and geometric development. The stream frequencies for both sub-watersheds
exhibit positive correlation with the drainage density, indicating increase in stream population with respect to increase
in drainage density. The Jilugumilli watershed has a coarse drainage texture and Regulapadu sub-watershed is a fine drainage
texture in nature. In the present study an attempt has been made to analyse the morphometric analysis of two sub-watersheds
under different physiographic conditions. Morphometric analysis is one of the essential analyses required for development
and management of watershed. |
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