BASIN ASYMMETRY INDEX AS AN INDICATOR OF ACTIVE TECTONICS IN GORIGANGA RIVER BASIN, EASTERN KUMAON HIMALAYA

S. Farooq, M. Nazish Khan

Abstract


This paper explores the ability of Digital Elevation Model (DEMs) in delineating watershed and drainage network of the Goriganga River Basin to decipher relative tectonic activity. For this purpose, the Goriganga river basin has been divided into 32 sub-basins in order make optimum number of analysis for visualization of tectonic pattern and intensity. Tectonic activity evident in the form of active thrusting and faulting that modify the landscape and drainage network. In the Goriganga river basin, the relatively high tectonic activity found in and along the major faults and thrusts includes Trans Himadri Fault (THF), Vaikrita Thrust (VT), Munisiari Thrust (MT) and Chhiplakot Thrust (CT) and transverse faults.  To documenting the tectonic activity, Drainage Basin Asymmetry (AF) has been calculated for 32 sub-basins and observed values have been transformed into a vector map. This vector map clearly indicates strong asymmetry in the NNW- SSE direction. This approach provides a quick appraisal of possible ground tilting in the neo-tectonically active Goriganga River Basin, Eastern Kumaon Himalaya and is of great utility in areas where active faults are concealed or poorly exposed.

Keywords


Neotectonic Tilting, Drainage basin asymmetry, Digital Elevation Model, Vectors and watershed

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References


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