The drainage basin is a unique example of geomorphic system. It is a fluvial system consisting of physical environment such as hill slopes, stream network, river channels etc and biological environment such as natural vegetation, riparian and riverine habitat. Such a geomorphic system is suitable for geomorphologic study where input of energy occurs from climate and endogenetic forces for evolution of landform and sustainable energy and matter output in the form of evapo transpiration to the atmosphere and loosing energy through water and sediments discharge largely through the basin mouth. This book presents a brief geomorphologic account of the Brahmaputra basin and a detailed study of fluvio- geomorphology of Kopili river basin, North East India. It is the outcome of the academic research of the author.

Ranjan Saikia is Retired Head of Geography Department, Cotton College, Guwahati, Assam. The author was awarded Doctor of Philosophy by Gauhati University in 1990. Dr Salkia conducted two minor projects and two major projects sponsored by UGC and Department of Science & Technology, New Delhi. Five scholars received PhD degree under his guidance. He has published many research papers in national journals. Besides this, Dr Saikia has also co-authored two books 'Prakritik Bhugul' and 'Anchalik Bhugul" for degree course under Gauhati University in Assamese, two books in the field of Geomorphology entitled 'Applicaion of Remote Sensing and GIS in Geomorpholgy', published by LAMBERT Academic Publishing, Germany and 'River Basin Geomorphology: A Geo-environmental Overview using Geotechnical tools', published by EBH Publishers (India) and 'Practical Geography Published by EBH, India.

The drainage basin is a unique example of geomorphic system. It is a fluvial system consisting of physical environment such as hill slopes, stream network, river channels etc. and biological environment such as natural vegetation, riparian and riverine habitat. A fluvial system is a drainage basin comprising of patterns formed by streams, rivers and wetlands etc. Such a geomorphic system is suitable for geomorphologic study where input of energy occurs from climate and endogenetic forces for evolution of landform and sustainable energy and matter output in the form of evapo-transpiration to the atmosphere and loosing energy through water and sediments discharge largely through the basin mouth. The concept of drainage basin system became significant with the gradual understanding of the mechanism of hydrological cycle and function of basin in conveying water from precipitation to the river (Gregory.K.J and Walling. D.E, 1973).

Present book is the outcome of my research work for doctorate degree entitled "Geomorphology of Kopili basin, North East India," The Kopili basin is a unique river basin with an evolutionary history and individuality of its own. The basin cover an area of 14760 km² lying to the south of the Brahmaputra River, which includes administrative district of Khasi and Jaintia hills of Meghalaya, Karbi Anglong, Dima Hasaw (North Cachar hills) and Nagaon district of Assam. The river basin provides a wide field for geomorphologic study which comprises of ancient landmass of Shillong Plateau and Karbi Anglong hills, the hill ranges of north Cachar (Dima Hasao), the intermontane valley and alluvial plains of Kopili river and its tributaries together presents a mosaic of landscape features.

The drainage basin is a unique example of geomorphic system. It is a fluvial system consisting of physical environment such as hill slopes, stream network, river channels etc. and biological environment such as natural vegetation, riparian and riverine habitat. A fluvial system is a drainage basin comprising of patterns formed by streams, rivers and wetlands etc. Such a geomorphic system is suitable for geomorphologic study where input of energy occurs from climate and endogenetic forces for evolution of landform and sustainable energy and matter output in the form of evapo-transpiration to the atmosphere and loosing energy through water and sediments discharge largely through the basin mouth. The concept of drainage basin system became significant with the gradual understanding of the mechanism of hydrological cycle and function of basin in conveying water from precipitation to the river (Gregory, K.J and Walling, D.E, 1973). As the water flows through the stream channels, the dynamics of processes between water and sediment and geology and hydrology of the landscape develops a complex network of processes. Therefore, drainage basin is a fundamental unit because of its functional significance of fluvial processes and analysis of form form and form-process relationship North East India comprises of parts of six river basins, The Brahmaputra River, Barak River, Manipur River, Kaladyne River, Karnafuli River and Tizu river basin. Among these river basins the Brahmaputra river basin in Arunachal Pradesh, Assam, Meghalaya and Nagaland covers an area of about 1,89,000 Sq. Km.

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