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IJSTR >> Volume 6 - Issue 2, February 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Application Of GIS For Degradation Level Assessment In Tropical Watershed

[Full Text]



M. Prawitasari, C.Y. Lee, C. Setyawan



GIS, land degradation, sediment delivery ratio, soil erosion, vegetation coverage.



High land occupancy for farming activity particularly in the upstream area was causing land degradation problem in many tropical watersheds. Land cultivation without good agricultural practice was resulting disasters in the downstream during wet season in form of debris flow, flood and sedimentation and in dry season in form of drought. Land conservation practices are required to conserve the function of watershed as rain water catchment area. Information about degradation level in the watershed is required for determining conservation strategies. This study was focusing on degradation level assessment in watershed scale by using Geographic Information System (GIS) in a tropical watershed. Five indicators were used for the assessment such as soil erosion, farm land occupancy index, vegetation coverage index, sediment delivery ratio and land slope average. The assessment was performed by applying scoring and weighting factor in each indicator. All parameters were analyzed using data from various sources. The result showed that indicator of farm land occupancy index and vegetation coverage index has bad category. Meanwhile, soil erosion, land slope index and sediment delivery ratio has good category, respectively. Total score of indicators was 2.6 means that the watershed was in moderate degradation level. GIS provides a good tool for degradation level assessment in the sub watershed scale.



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