Channel bed aggradation in relation to channel Morphometry: A case study of river Jainti, Jalpaiguri, West Bengal

摘要

Channel behaviour is so dynamic in areas of foothills where it debouches over the sudden slope change but being carried with its huge quantity of load. Such loads may be of both weathered and fluviatile in character so far process is concerned. Morphology of a channel is shaped up by the aggradational mechanisms in the channel. It may be caused by the soil characters as exemplified in the present study area which is abundant of calcites and limestone-dolomitic compositions and which result into seepage of surface flows and outcome of ephemeral channels at times especially during wet seasons. Haphazard in-channel dumping resembling corrugated surface topography is accentuated by the falling of gravity propelled slides and incompetency of the channels to carry the burden downstream. In the present study reasoning behind such bed filling occurrences in relation to its morphometry has been carried out with geomorphological perspectives.