GIS-based morphometric analysis of five major sub-watersheds of Song River,Dehradun District,Uttarakhand with special reference to landslide incidences |
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| Authors: | Arpita Pankaj Pankaj Kumar |
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| Institution: | (1) Department of Environmental Science, Bangalore University, Bangalore, 56, India;(2) Department of Civil Engineering, UVCE, Bangalore University, Bangalore, 56, India; |
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| Abstract: | Evaluation of the morphometric parameters requires preparation of drainage map, contour map, ordering of the various streams
and measurements of catchment area, perimeter, relative relief, relief ratio, length of drainage channels, drainage density,
drainage frequency, bifurcation ratio, texture ratio, circulatory ratio and constant channel maintenance, which help to understand
the nature of the drainage basin. The present study involves the Geographic Information System (GIS) analysis techniques to
evaluate and compare linear, relief and aerial morphometry of the five subwatersheds of Song River (tributary of the Ganga
River) with special reference to landslide incidences, for future development and planning of the watershed. Jakhan Rao, Song
River, Bandal Nadi, Baldi Nadi and Suswa Nadi are the five major subwatersheds of the Song River basin. All the subwatersheds
are basically of 5th to 6th order. Drainage patterns are mainly dendritic to sub dendritic. The drainage pattern of the Song River basin is mainly structurally
controlled and the area is characterized by high to moderate relief. The asymmetric factor indicates that the tectonic rotation
of the four subwatersheds is upward on the right side of the drainage basin and only one sub-watershed is downward. The numbers
of the landslide incidences are also more in the upward side, than the downward side of the Song River basin. |
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