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Wetlands in Brahmaputra River Valley, Brahmaputra River Valley in Assam, Brahmaputra River Valley, Brahmaputra River Valley Assam |
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BRAHMAPTURA RIVER VALLEY Assam
Location: northeast to the Assam Valley from the Bangladesh border upstream to the confluence of the Lohit and Dibang rivers, Assam
Area: Area of wetlands unknown, but probably over 500,000 ha
Altitude: 30-100 m
Biogeographical province: 4.9.4
Wetland type: 11, 13, 14, 15, 18, 19, 21
Description of site: The Brahmaputra floodplain forms one vast wetland region, particularly during years of above average rainfall, for example 1987. The area stretches for over 600 km from the frontier with Bangladesh (25’45’N, 89°50’E), where the valley exceeds 90 km in width, to the point where its two principal tributaries, the Lohit and Dibang, unite (27’50’N, 95’40’E). Here the valley has narrowed to less than 50 km in width. The river itself already exceeds three kilometres in width at the confluence of the Lohit and Dibang, and widens to nearly 10 km at the Bangladesh border. In common with the other great north Indian rivers, it changes course frequently, leaving permanent or seasonal lakes and marshes in the abandoned channels. There are over 70 such lakes measuring between 100 ha and 500 ha in area, but only five or six exceeding 500 ha. At several points, the valley is significantly constrained by the northward projecting spurs of the Naga and Shillong Hills, and it is here that the principal urban areas have become established, e.g. Gauhati and Goalpara. The expansion of urban areas, industrial activity, and the intensification of agriculture are putting great pressure on the wetland resources of the Brahmaputra. A number of sanctuaries have been established in the valley, but as yet none has been created specifically for its wetland ecosystem. This would seem to be an urgent priority. Six of the most important sites within the Brahmaputra Valley are treated separately below
Location: northeast to the Assam Valley from the Bangladesh border upstream to the confluence of the Lohit and Dibang rivers, Assam
Area: Area of wetlands unknown, but probably over 500,000 ha
Altitude: 30-100 m
Biogeographical province: 4.9.4
Wetland type: 11, 13, 14, 15, 18, 19, 21
Description of site: The Brahmaputra floodplain forms one vast wetland region, particularly during years of above average rainfall, for example 1987. The area stretches for over 600 km from the frontier with Bangladesh (25’45’N, 89°50’E), where the valley exceeds 90 km in width, to the point where its two principal tributaries, the Lohit and Dibang, unite (27’50’N, 95’40’E). Here the valley has narrowed to less than 50 km in width. The river itself already exceeds three kilometres in width at the confluence of the Lohit and Dibang, and widens to nearly 10 km at the Bangladesh border. In common with the other great north Indian rivers, it changes course frequently, leaving permanent or seasonal lakes and marshes in the abandoned channels. There are over 70 such lakes measuring between 100 ha and 500 ha in area, but only five or six exceeding 500 ha. At several points, the valley is significantly constrained by the northward projecting spurs of the Naga and Shillong Hills, and it is here that the principal urban areas have become established, e.g. Gauhati and Goalpara. The expansion of urban areas, industrial activity, and the intensification of agriculture are putting great pressure on the wetland resources of the Brahmaputra. A number of sanctuaries have been established in the valley, but as yet none has been created specifically for its wetland ecosystem. This would seem to be an urgent priority. Six of the most important sites within the Brahmaputra Valley are treated separately below
For Wetlands in Brahmaputra River Valley
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