Question

Give the main characterstics of Ganga Brahmaputra river system

Answer 1

The basin of the Brahmaputra river is 651 334 km2 and it is a good example of a braided river and meanders quite a bit and frequently forms temporary sand bars. A region of significant tectonic activity has developed in the Jamuna River and is associated with the Himalayan uplift and development of the Bengal foredeep. Several researchers has hypothesized that the underlying structural control on the location of the major river systems of Bangladesh. A zone of 'structural weakness' along the present course of the Ganga-Jamuna-Padma Rivers due to either a subsiding trough or a fault at depth has been observed by Morgan and Melntire.(1959). Scijmonsbergen (1999) contends that width changes in the Jamuna may respond to these faults and they may also cause increased sedimentation upstream of the fault. He presented a few images to argue that a fault downstream of the Bangabandhu Multipurpose Bridge has affected channel migration. Huge accumulations of sediment that have been fed from Himalayan erosion has been produced due to the deepening of the Bengal Basin, with the thickness of sediment above the Precambrian basement increasing from a few hundred metres in the shelf region to over 18 km in the Bengal foredeep to the south. The tectonic and climatic context for the large water and sediment discharges in the rivers of Bangladesh was set by the ongoing subsidence in the Bengal Basin, combined with high rates of Himalayan uplift. The control of uplift and subsidence is, however, clear. The courses of the Jamuna and Ganga Rivers are first-order controls due to the fact that they are most influenced by the uplifted Plcistoccnc terraces of the Barind and Madhupur tracts.[13]

Answer 2

Answer:

• It originates from Tibet and is slightly longer than the Indus.
• It carries huge amount of silt.
• It flows parallel to the Himalayan Mountains in Tibet.
• It takes a ‘U’ turn at Namcha Barwa (height 7757 mts.) and enters Arunachal Pradesh.