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Debojit Baruah Lakhi P. Hazarika Bikramaditya Bakalial Sabita Borah Ranjit Dutta S. P. Biswas 《The Environmentalist》2012,32(1):85-90
The Ganges River dolphin (Platanista gangetica Roxburgh) of Subansiri River may be in great danger of extinction due to the construction of the 2,000-MW Lower Subansiri
Hydroelectric Project, which started in 2006. A recent survey indicates that there are now 29 Ganges dolphins, up from 21
in 2006. It is feared that drastic changes would occur in the downstream hydrology and ecology of the Subansiri River after
the installation of the project, scheduled for 2012. The water discharge during a major part of the day in dry months would
come down to a meager 6 cumecs from the present average of 450 cumecs (1 cumec is shorthand for cubic meter per second; also
cms, or m3/s (m3s–1). Riverine mega fauna like the dolphin would be worst hit by this extremely low discharge. Dumping of an extra amount of
sediment from different construction phases has already increased sediment load in the Subansiri downstream and degraded some
earlier pockets of dolphin up to 20 km below the dam site. There is reason to believe that high sediment influx might have
silted up some of the deeper pools downstream, a preferred habitat of dolphins, forcing them to congregate close to the confluence
of the Subansiri. 相似文献
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