000034469 001__ 34469
000034469 041__ $$aEnglish
000034469 100__ $$aMishra, K.
000034469 245__ $$aTowards the Assessment of Sediment Connectivity in a Large Himalayan River Basin
000034469 260__ $$c2019
000034469 300__ $$a251-265
000034469 507__ $$aKanchan Mishra. Santosh Nepal, Kabir Uddin, ICIMOD staff, peerreviewed
000034469 520__ $$aSediment connectivity, defined as the degree of linkage between the sediment sources to downstream areas, is one of the most important properties that control landscape evolution in river basins. The degree of linkages amongst different parts of a catchment depends mainly on the hinterland characteristics (e.g. catchment morphology, slope, shape, relief, and elevation), channel characteristics (e.g. slope, stream network density, valley confinement), and the combined effects of vegetation (e.g. land use changes and land abandonment). This paper evaluates the sediment connectivity of the upper Kosi basin covering an area of ~52,731 km2 including Tibet and Nepal at different spatial scales. We have computed the index of connectivity (IC) using the equations originally proposed by Borselli et al. (2008) and modified by Cavalli et al. (2013) to evaluate the potential connection of sediment source areas to the primary channel network as well to the catchment outlet. Our results highlight significant spatial variability in sediment connectivity across the basin and provide important insights on structural sediment dynamics in a complex geological and geomorphological setting. We compare our results with the observed sediment load data at certain outlets and demonstrate that sediment flux in different sub-basins is controlled by variable slope distribution and land use and land cover that are strongly related to the structural connectivity. We argue that IC model can be extremely beneficial to understand sediment dynamics at catchment scale in a large river basin (~103–104 km2 scale), where systematic field investigations for mapping hillslope-channel linkages are not feasible.
000034469 653__ $$aSediment Dynamics
000034469 653__ $$aStructural Connectivity
000034469 653__ $$aIndex Of Connectivity
000034469 653__ $$aLarge Rivers
000034469 653__ $$aHimalaya
000034469 700__ $$aSinha, R.
000034469 700__ $$aJain, V.
000034469 700__ $$aNepal, S.
000034469 700__ $$aUddin, K.
000034469 773__ $$pScience of The Total Environment
000034469 773__ $$v661 
000034469 773__ $$ahttps://doi.org/10.1016/j.scitotenv.2019.01.118
000034469 8564_ $$uhttp://www.sciencedirect.com/science/article/pii/S0048969719301354$$yExternal link
000034469 8564_ $$uhttp://lib.icimod.org/record/34469/files/icimod1.pdf
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000034469 980__ $$aICIMODEXT