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Title: Identification of sediment source and sink areas in a Himalayan watershed using GIS and remote sensing
Authors: Jain, Manoj Kumar
Mishra, Surendra Kumar
Shah R.B.
Published in: Land Degradation and Development
Abstract: Erosion is a natural geomorphic process occurring continually over the Earth's surface and it largely depends on topography, vegetation, soil and climatic variables, and therefore, exhibits pronounced spatial variability due to catchment heterogeneity and climatic variation. This problem can be circumvented by discretizing the catchme1nt into approxima1tely homogeneous sub-areas using GIS. In this study, the remote sensing and GIS techniques (through Imagine®8.6 and ArcGIS®9.1 software) were used for derivation of spatial information, catchment discretization, data processing etc. for the Himalayan Chaukhutia watershed (India). Various thematic layers for different factors of USLE were generated and overlaid to compute spatially distributed gross soil erosion maps fo1r the watershed using 18-year rainfall data. The concept of transport limited accumulation was formulated and used in ArcGIS® for generating the transport capacity maps. Using these maps, the gross soil erosion was routed to the catchment outlet using hydrological drainage paths, for derivation of transport capacity limited sediment outflow maps. These maps depict the amount of sediment rate from a particular grid in spatial domain and the pixel value of the outlet grid indicates the sediment yield at the outlet of the watershed. Up on testing, the proposed method simulated the annual sediment yield with less than ±40% error. Copyright © 2009 John Wiley & Sons, Ltd.
Citation: Land Degradation and Development (2009), 20(6): 623-639
Issue Date: 2009
Keywords: GIS
Remote sensing
Sediment yield
Soil erosion
Transport capacity
Transport limited accumulation
ISSN: 10853278
Author Scopus IDs: 55555537300
Author Affiliations: Jain, M.K., Department of Hydrology, Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India
Mishra, S.K., Department of Water Resources Development and Management, Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India
Shah, R.B., Department of Irrigation, Government of Nepal, Lalitpur, Kathmandu, Nepal
Corresponding Author: Jain, M.K.; Department of Hydrology, Indian Institute of Technology, Roorkee 247 667, Uttarakhand, India; email:
Appears in Collections:Journal Publications [WR]

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