Jim Best, Philip J. Ashworth, Charlie S. Bristow, Julie E. Roden
Abstract The three-dimensional subsurface alluvial architecture of a large (approximately 3 km long, 1 km wide, 12 m high), mid-channel sand braid bar in the Jamuna River, Bangladesh is described. Evolution of the bar and its depositional characteristics are assessed from a unique combination of gro...
Charlie S. Bristow
Abstract The Brahmaputra River is one of the world’s largest sand-bed braided rivers with a channel belt up to 15 km wide, a mean channel depth of 5 m and maximum scour depths of up to 40 m. The recorded discharge varies by around 60 000 cumecs every year following the annual monsoon, producing dram...
Charlie S. Bristow
Avulsion of rivers from one course to another may result in metamorphosis of channel pattern. The Brahmaputra River, a large sand-bed braided river, avulsed into its present course along the Jamuna channel over 100yr ago. Cartographic evidence indicates that the avulsion was gradual rather than inst...
Charlie S. Bristow, Jim Best, Philip J. Ashworth
A large (2 km X 1 km) sand bar has been surveyed using ground penetrating radar (GPR), augmented by vibracoring and trenching, to investigate the sedimentary structures and three-dimensional alluvial architecture. Around 8 Km of GPR profiles were collected with nine survey lines running transversely...
Charlie S. Bristow, Jim Best, Philip J. Ashworth
A large (2 km X 1 km) sand bar has been surveyed using ground penetrating radar (GPR), augmented by vibracoring and trenching, to investigate the sedimentary structures and three-dimensional alluvial architecture. Around 8 Km of GPR profiles were collected with nine survey lines running transversely...