Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/2732
Título: Land use/ land cover change and its impact on soil erosion process in Begnas Tal Rupa Tal watershed using geospatial tools, Kaski district, Nepal
Autor: Koirala, Saroj
Orientador: Cabral, Pedro
Pebesma, Edzer
Bañon, Filiberto Pla
Palavras-chave: GIS
Land use change
Mountain
Soil erosion
Watersheds
Data de Defesa: 2-Mar-2010
Relatório da Série N.º: Master of Science in Geospatial Technologies;TGEO0030
Resumo: The spatial-temporal analysis of changes in land use/land cover between 1988 and 1999 at Begnas Tal Rupa Tal Watershed, covering an area of about 50.94 km² in Kaski District, Nepal, reveals the changing scenario of land use/land cover and their consequent effect on soil erosion. The geo-spatial analysis of database generated from the satellite images, ancillary database and socio-economic information critical/vulnerable areas of land degradation are identified. Visual interpretation technique is carried out for land use/land cover by comparing satellite images of Landsat TM from 1988 to 1999 using GIS tools. Datasets of moderate spatial resolution (Landsat TM) have been processed. The geo-spatial analysis results show an increase in major land use/land cover such as agricultural land, dense mixed forest and settlement whereas there is decrease in barren land and open forest. The main land cover such as open forest and barren land are converted both into agricultural land and settlement. This change in land use indicates that the mountain land use is changing rapidly in the Himalayan region. It has not only disrupted ecological balance of the watershed but also reduced ground water recharge, increased run-off and soil erosion as well. Changing land uses/land covers have accelerated the process of soil erosion, loss of top soil and leaching of nutrients in upstream area on the one hand and sedimentation in lakes, reservoirs and river channels on the other. The rain-fed agriculture is contributing maximum to soil losses. High soil erosion is found in sloppy areas where unscientific farmland management practices are prevailing. Most of woody vegetated lands fall on low soil erosion areas. Information obtained using remote sensing techniques can help decision makers to prepare resource map accurately in less time and cost. For the estimation of soil loss by using Morgan approach, the various factor maps can be generated. The lower soil losses are recorded under forest cover and irrigated agricultural land.
Descrição: Dissertation submitted in partial fulfilment of the requirements for the Degree of Master of Science in Geospatial Technologies
URI: http://hdl.handle.net/10362/2732
Aparece nas colecções:NIMS - MSc Dissertations Geospatial Technologies (Erasmus-Mundus)

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