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Analisis Kerentanan Tanah Longsor Sebagai Dasar Mitigasi Di Kabupaten Banjarnegara (Vulnerability Analysis as a Basic for Landslide Mitigation in Banjarnegara Regency) Image
Journal article

Analisis Kerentanan Tanah Longsor Sebagai Dasar Mitigasi Di Kabupaten Banjarnegara (Vulnerability Analysis as a Basic for Landslide Mitigation in Banjarnegara Regency)

Landslide is a hydrometeorologycal disaster that usually happens in Indonesia. The purpose of this study was to determine the level of landslide vulnerability in Banjarnegara District. This study employed survey and descriptive quantitative methods by using a formula of landslide vulnerability, with variables: natural and management factors. The analysis used in this study was overlaying the predetermined formula and weighting it. The results indicated a variety of vulnerability classes, which were: 1) non-vulnerable zone of 44.88 ha (0.04%), 2) slightly vulnerable zone of 7,800.84 ha (7.29%), 3) fairly vulnerable zone of 88,505.80 ha (82.74%), 4) vulnerable zone of 10,423.32 ha (9.74%), and 5) very vulnerable zone of 196.16 ha (0.18%). The dominant parameters for landslides in Bajarnegara were: rain, geology and regolith. Mitigation techniques employed in those areas should be based on community-self-supporting mitigation through the development of disaster resilient villages. Disaster resilient village is a village that is responsive and can minimize disaster risks through adaptation. Several measures can be done independently autonomously by the community including increase the alertness during rainy period, seal all cracked soil due to the fault movement, and protect the soils through slope (stabilization and protection of slopes).
Sedimentasi Delta Sungai Citarum, Kecamatan Muara Gembong, Kabupaten Bekasi (Sedimentation at Delta of Citarum River Muara Gembong District, Bekasi Regency) Image
Journal article

Sedimentasi Delta Sungai Citarum, Kecamatan Muara Gembong, Kabupaten Bekasi (Sedimentation at Delta of Citarum River Muara Gembong District, Bekasi Regency)

One of land use change impacts in the downstream of Citarum watershed is sedimentation. This study aimed to determine the total suspended solid and sediment load in the downstream of Citarum River. The Total Suspended Solid (TSS) samples were taken in three locations: the inlet of Jatiluhur reservoir, the outlet of Jatiluhur reservoir, and before the Citarum River estuary. The frequency of TSS samplings was twice a year i.e during the dry season and the rainy season at 2014. Analysis of TSS content was in accordance with SNI 06-6989.3-2004 using gravimetry method. The results showed that TSS at down stream Citarum River flow was 0.44 kg/m3, TSS at the inlet of Jatiluhur reservoir was 0.20 kg/m3, and TSS at the outlet of Jatiluhur reservoir was 0.02kg/m3. The total sediment in the inlet of Jatiluhur was 1.34 x 106ton/year, in the outlet of Jatiluhur reservoir was 0.14 x 106ton/year, and the flow sediment total to the Citarum River estuary was 1.79 x 106 ton/year. The Jatiluhur reservoir could reduce the potential for sediment total flowing into the sea as much as 1.20x 106tons/year. Area of sedimentation at the delta of Citarum River was 3,828.26 ha.
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Daerah Bahaya Banjir Di Sub Daerah Aliran Sungai Sepauk Dan Tempunak, Kabupaten Sintang, Provinsi Kalimantan Barat (Flood Hazard in Sepauk and Tempunak Sub Watersheds, Sintang Regency, West Kalimantan Province) Image
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Daerah Bahaya Banjir Di Sub Daerah Aliran Sungai Sepauk Dan Tempunak, Kabupaten Sintang, Provinsi Kalimantan Barat (Flood Hazard in Sepauk and Tempunak Sub Watersheds, Sintang Regency, West Kalimantan Province)

Flood-prone areas mapping is often constrained by limited data availability at the site level. A quick assessment of sub watershed degradation method can be used to identify the degradation level of a sub watershed includes the flood hazard areas. This method is very easy to be applied at a site level using Geographic Information System (GIS), although it has minimum data. The aim of this study was to analyze the level of flood hazard in Sepauk and Tempunak Sub Watersheds, Sintang Regency, West Kalimantan Province. The required data were DEM/ SRTM (Digital Elevation Model/ Shuttle Radar Topography Mission), daily rainfall, and land cover. Quick assessment of sub watershed degradation method was applied to classify the flood-prone level of the study areas. The results showed that most of the study areas were categorized as high level of flood hazard (78% for Sepauk and 56% for Tempunak). The land covers of those areas were dominated by mixed dryland agriculture, bare land, and settlements. In addition, high level of flood hazard areas in Sepauk Sub Watershed was also affected by the existence of mining and dryland agriculture areas. Since the land cover change is a dynamic process, the flood hazard areas mapping should also be adjusted continuously to minimize the flood impact.
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