Abstract
River Siang is the one of the major rivers of Arunachal Pradesh and also an important influent tributary leading to the mighty River Brahmaputra. River Siang is Hill-Stream 1st order river; has colluvial valley segment and pool-riffle type of reach. This reach type is most commonly associated with small to mid-size streams and is a quite prevalent type of reach in the rheophilic zones. Pools and riffles alternating with cascades are generally found to dominate the micro-habitat type with frequent occurrence of trench pools. The substrate type has been found to be dominated by bedrocks, boulders, gravels and cobbles. An analysis of the drainage network of a part of River Siang was undertaken to reveal the role of drainage water activity of the area. A number of fluvial geomorphic dissimilarities have been identified in the area. A prominent annular pattern is observed in the central part of the area. The total length of River Siang in Arunachal Pradesh is 293.9 km. This study revealed that the development of topography and drainage system of the study area have been influenced by active sub-surface geological structures.
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