Lithofacies associations and channel flow characteristics associated with a Unit Bar of the Brahmaputra River in Dibrugarh, Assam, INDIA

Sedimentation in a fluvial system leads to the formation of bars with varied morphology, bedform features and internal stratification. These features bear imprints of the hydrodynamic conditions which had prevailed during bar formation and development. The Brahmaputra River of north-east India represents a sandy braided river with very large bedforms and frequent channel migration, switching and avulsion. This study examines the lithofacies types and their associations which had developed in different parts of a Unit Bar of the Brahmaputra River near Dibrugarh, Assam. The study indicates that lithofacies associations in a braided river deposit may show frequent variations due to changes in the prevailing hydrodynamic conditions in the area