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Soil Erosion Dynamics Due to Land Use / Land Cover Changes, Case study in Upper Serayu Watershed, Indonesia

Rustanto, Andry (2010) Soil Erosion Dynamics Due to Land Use / Land Cover Changes, Case study in Upper Serayu Watershed, Indonesia.

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Abstract:Soil erosion has become a serious problem to the environment and human life. Decreasing of soil fertility, increasing of sedimentation in the reservoir are two most problem because of erosion in the upper Serayu watershed. Decreasing of soil fertility will require more to fertilizer uses and also can be followed by opening new cropping area by deforestation. The aim of this study is assessing land use / land cover changes in the upper Serayu watershed during 1989 to 2009 and relating the changes during that period to the soil erosion. There are 4 main step in this study:1) generating land use / land cover map for 5 years interval during 1989 to 2009; 2) assessing land use / land cover changes during 1989 to 2009; 3)assessing soil erosion of the area based on actual sedimentation data and soil loss prediction model; 4) estimating reservoir lifetime based on actual and predicted sedimentation data. Major land use / land cover of the upper serayu watershed are: built up area, paddy field, water body, dry land cultivation, forest, shrub, plantation and bare soil. The land use / land cover classification was obtained by employing sequential maximum a posteriori (SMAP) algorithm. This algorithm could increase accuracy assessment by 15 % in this study. To predict land use / land cover of previous period, spectral angle and magnitude of present classified image were using to obtain training/signature area. To obtain the class signatures, all images have to be corrected atmospherically and topographically. Final classification will be processed by SMAP algorithm. Land use / land cover of the upper Serayu watershed has showed changes during 1989 to 2009. Forest has been decreased by 1552.9 ha per year, replaced by growing of dry land cultivation area and plantation forest. Sedimentation rate in the PBS reservoir during 1989 to 2009 showed to increase. Indicating that soil erosion in the catchment is increasing. Mean sedimentation rate during 1989 to 2009 is about 4 million m3 per year. Revised Morgan-Morgan and Finney (RMMF) method was used to assess soil loss based on land use / land cover. Bare soil showed the highest rate, followed by dry land cultivation and plantation forest. However the RMMF model needs to be validated. Based on sedimentation report of the reservoir, the reservoir will stop to function on 2023, meanwhile based on modelling result will be stop to fuction on 2051. Keyword : Land use / land cover changes, reservoir sedimentation, soil loss, reservoir lifetime
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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