REMOTE SENSING AND GIS BASED GEOMORPHIC INVESTIGATIONS LEND INSIGHTS INTO ACTIVE TILT-BLOCK TECTONICS OF THE CENTRAL FRONTAL HIMALAYA, INDIA

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Year:
2016
Type of Publication:
Proceedings
Keywords:
Remote sensing, GIS, tilt-block tectonics, geomorphic indices, Himalaya
Authors:
Goswami, P K; Deopa, Tanuja
Abstract:
Remote sensing and Geographic Information System (GIS) based geomorphic investigations have provided new insight into the active tilt-block tectonics of two adjacent mountain segments of the frontal central Himalaya. The morphology and denudation patterns of these mountain segments, referred to here as the ‘eastern’ and ‘western’ segments, have been analyzed in conjunction with characteristics of drainages and drainage basins developed on them. Separated from each other and adjoining mountain-segments by antecedent streams of fourth- and fifthorder, the morphology and denudation of these segments have been quantitatively expressed in terms of ‘mountain-front sinuosity’ (Smf) and ‘valley-floor width to height ratio’ (Vf), whereas the drainage basins developed on them have been characterized in terms of such geomorphic indices as ‘basin asymmetry factor’ (AF), ‘transverse topography asymmetry factor’ (T), ‘basin elongation ratio’ (BR) and ‘hypsometric integral’ (HI). In both the mountain-segments, the Smf values are mostly between 1.0–1.6 and, likewise, the Vf of most of the streams, calculated at a fix distance of 800m from the mountain-front, is invariably
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