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Sudibyakto Sudibyakto
Faculty of Geography, Gadjah Mada University
Earth & Planetary Sciences

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LAND USE PLANNING FOR SETTLEMENTS AREA IN CONSIDERATION OF FLOOD AND LANDSLIDE HAZARDS IN BAGELEN SUB-DISTRICT, PURWOREJO INDONESIA Estuning Tyas Wulan Mey; Sudibyakto Sudibyakto; Nanette C. Kingma
Indonesian Journal of Geography Vol 41, No 1 (2009): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.1572

Abstract

The objective of this research is  determining alternative land use for settlement development considering  its hazards susceptibility.  Data were obtained by interviews, participatory GIS, direct-observation, sampling of soil  and secondary data analysis. The flood hazard map was produced using Kriging interpolation techniques; flood depth map for the largest flood in the year 2004 was created. The area with high landslide hazard is located on the hilly area in the eastern part of the area of study. The result from overlaying two hazard maps indicates that the area which considered as having less hazards  is located on the colluvial plain. The result of suitability analysis including hazard and people perception-based criteria showed that the area suitable is mostly located in Bagelen and Krendetan Villages. The result of suitability analysis of the non-hazard criteria showed that the area suitable  of which 338.1 Ha is an existing settlement. 
APPLICATION OF US-SCS CURVE NUMBER METHOD AND GIS FOR DETERMINING SUITABLE LAND COVER OF SMALL WATERSHED Christanti Nana Widiyati; Sudibyakto Sudibyakto
Indonesian Journal of Geography Vol 42, No 1 (2010): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.1578

Abstract

This study aims to reveal the appropriate land cover which can reduce runoffusing US-SCS Curve Number method with GIS. Four land cover scenarios aredeveloped to reveal which one of existing land cover types is appropriate for thearea. To make a validation of the application US-SCS Curve Number Method,calculating observational run-off is required. Statistical analysis is than used totest those two run-off data. The result of this study shows that actual run-off depthis 2143, 0 mm and peak discharge is 91, 76 m3/s. The result also reveals that forestcoverage can reduce dramatically surface run-off until 48, 38 percent. Potatoincreases surface run-off 1, 59 percent, on the contrary, applying cacica papayacan reduce surface run-off 24, 6 percent. Scenario 4 is developed based on theresult of the previous scenario on run-off yield. Run-off yield result from scenario 4is 1690, 40 mm (decrease 21, 14 percent from actual run-off). Statistical analysisshows that there is no difference between observed run-off depth and estimatedrun-off depth in the level of significance 5 %.
Co-Authors Christanti Nana Widiyati Estuning Tyas Wulan Mey Nanette C. Kingma