Article 535 by Vikrant Jain1*, Sonam1, Ajit Singh1, Rajiv Sinha2, S. K. Tandon3 Evolution of modern river systems: an assessment of ‘landscape memory’ in Indian river systems 1.Discipline of Earth Sciences, Indian Institute of Technology Gandhinagar, Gujarat-382355, India 2. Department of Earth Sciences, IIT Kanpur, Uttar Pradesh 208016 3. Department of Earth and Environmental Sciences, IISER Bhopal; * Corresponding author, Email:
[email protected] (Received : 31/10/2018; Revised accepted : 24/07/2019) https://doi.org/10.18814/epiiugs/2020/020035 Every river basin is characterised by an evolutionary contemporary basin physiography bears the imprints of the past river history, which may be analysed at different time scales. processes. Such parameters serve as boundary conditions within which the present day landscape-forming processes operate (Brierley and This study provides a geological and geomorphic history Fryirs, 2005). The elevation and relief of a region influence the of different river basins of India at different time scales orographic precipitation and also determine the potential energy of ranging from millions of years to millennial time scales. water flowing downslope. The coupled effect of climate and tectonics The river basins in India are divided into six different is crucial for the long-term sustenance of river basins. While uplift groups on the basis of different tectono-climatic settings creates relief, runoff and discharge facilitate erosion for the maintenance of hill and channel slope (for water and sediment and geomorphic characteristics. The evolutionary transfer). Lithology and inherent structural discontinuities dictate the trajectories in the past strongly govern the modern day sediment availability, and the prevailing climatic conditions determine geomorphic characteristics and processes in a river the sediment transport and redistribution rates.