000031710 001__ 31710
000031710 041__ $$aEnglish
000031710 041__ $$aEnglish
000031710 100__ $$aUddin, K.
000031710 245__ $$aEstimation of Soil Erosion Dynamics in the Koshi Basin Using Gis and Remote Sensing to Assess Priority Areas for Conservation
000031710 260__ $$c2016
000031710 260__ $$aKathmandu, Nepal
000031710 300__ $$ae0150494-e0150494
000031710 300__ $$a101-110
000031710 507__ $$aKabir Uddin , MSR Murthy , Shahriar Wahid , Mir Matin, ICIMOD staff, peerreviewed, servier, KDRR KDLandS
000031710 511__ $$aKoshi, Article, kbProject
000031710 520__ $$aHigh levels of water-induced erosion in the transboundary Himalayan river basins are contributing to substantial changes in basin hydrology and inundation. Basin-wide information on erosion dynamics is needed for conservation planning, but field-based studies are limited. This study used remote sensing (RS) data and a geographic information system (GIS) to estimate the spatial distribution of soil erosion across the entire Koshi basin, to identify changes between 1990 and 2010, and to develop a conservation priority map. The revised universal soil loss equation (RUSLE) was used in an ArcGIS environment with rainfall erosivity, soil erodibility, slope length and steepness, cover-management, and support practice factors as primary parameters. The estimated annual erosion from the basin was around 40 million tonnes (40 million tonnes in 1990 and 42 million tonnes in 2010). The results were within the range of reported levels derived from isolated plot measurements and model estimates. Erosion risk was divided into eight classes from very low to extremely high and mapped to show the spatial pattern of soil erosion risk in the basin in 1990 and 2010. The erosion risk class remained unchanged between 1990 and 2010 in close to 87% of the study area, but increased over 9.0% of the area and decreased over 3.8%, indicating an overall worsening of the situation. Areas with a high and increasing risk of erosion were identified as priority areas for conservation. The study provides the first assessment of erosion dynamics at the basin level and provides a basis for identifying conservation priorities across the Koshi basin. The model has a good potential for application in similar river basins in the Himalayan region.
000031710 653__ $$aD Paudel(eds), Nepal Disaster Report 2015
000031710 700__ $$aMurthy, M. S. R.
000031710 700__ $$aWahid, S. M.
000031710 700__ $$aMatin, M. A.
000031710 773__ $$pPloS one
000031710 773__ $$v11 (3)
000031710 773__ $$a10.1371/journal.pone.0150494
000031710 8564_ $$uhttp://journals.plos.org/plosone/article?id=10.1371/journal.pone.0150494$$yExternal link (open access)
000031710 8564_ $$uhttp://lib.icimod.org/record/31710/files/icimod.pone.0150494.PDF
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000031710 980__ $$aARTICLE