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IJSTR >> Volume 9 - Issue 1, January 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Spatio-Temporal Changes In The Fluvial Geomorphology In A Part Of The Upper Assam Area And Its Correlation To Subsurface Geology

[Full Text]



Himanta Borgohain



Dikhow, Dhansiri, Jorhat fault, neo-tectonism, river dynamics, pop-up.



The fluvial dynamics of two major tributaries of the Brahmaputra River, the Dikhow and the Dhansiri in a part of the upper reach of the Brahmaputra valley (Assam, India) adjacent to the Mikir hills and the Naga Patkai thrust belt has been studied over a period of ninety plus years (1915-2008) in the GIS environment by using topographic maps, satellite imageries, SRTM data, and seismotectonic information of the area. The temporal change in the morphological signature of the Dikhow River is least which is represented in the high correlation coefficient of its sinuosity values for different segments over the aforesaid period. The Dhansiri River on the contrary shows a very poor correlation coefficient for the same parameter. This is most probably due to the ongoing neo-tectonism about the Jorhat fault. The study makes an effort to locate areas of valley subsidence as well as upliftment. When compared with the available database of basement, it was observed that the Jorhat fault separates the study area distinctly into two tectonic blocks, one is the Dhansiri valley on the south-western part of the Jorhat fault, and the other is the subset of the upper reach of the Brahmaputra valley. A conceptualized ‘pop-up’ model is proposed, that relates the Himalayan frontal thrust (HFT) with the popping up Mikir Hills in the eastern front from one end and westward thrust front of the Naga thrust in the other end causing upliftment of south western part of the study area (Dhansiri valley) that explains clearly the avulsive tendency in the Dhansiri River and its drastic change in the geomorphological signature.



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