Morphotectonic Study of the Ijai Watershed, in Parts of Kangpokpi, Tamenglong and Noney Districts Manipur, India

Abstract

The present study aims to describe and bring out the tectonic nature of Ijai watershed in parts of Kangpokpi, Tamenglong and Noney districts of Manipur. Ijai watershed has an area of 184.0 Km2which is also tectonically active as depicted by the analysed values of different geomorphic indices like SLK index, Valley Floor Width to Valley Height ratio (Vf),Transverse Topographic Symmetry (T), Drainage Basin Asymmetry (AF), Basin Elongation Ratio (Eb), hypsometric curve and its integral. The data for the analysis of the geomorphic indices are extracted from the DEM and SENTINEL-2 satellite data and SOI-toposheets. Along the stresses of the rivers there are numbers of regions having SLK index greater than 2 depicting presence of knick points.Vf values ranges from 0.053 to 0.144 showing V-shaped valleys with streams that are actively incising and are commonly associated with uplift. Average value of T of Ijaiis found to be 0.4182, which reflects asymmetric in nature. The results of AF is 36.47 %, signifies the upliftment of the eastern side of the basin resulting the shifting of the river to western side in general. The result of Basin Elongation ratio (Eb) is 0.59 which signifies elongated basin undergoing tectonically activities. The result of hypsometric curve and hypsometric integral (Hi) 49 % reveals that basin is passing through early mature stage under the cycle of erosion.