GIS BASED FLOOD HAZARD AND VULNERABILITY MAPPING: A CASE STUDY OF TIDAL AND RIVER FLOODS IN DOWNSTREAM OF CIASEM WATERSHED, SUBANG-WEST JAVA

Author

Budi Hadi Narendra, Harris Herman Siringoringo, Chairil Anwar Siregar

Abstract

Flood events in downstream of  Ciasem watershed are believed to occur due to degradation of  watershed and mangrove cover. This paper studies the flood hazard and vulnerability caused by tidal and river flood, mainly on vegetation and built up areas as the main element of  risk. The observation was focused at downstream of  Ciasem watershed, located in MuaraVillage, Blanakan subdistrict, north coastal region of  Subang District. Tidal flood hazard was mapped using iteration process in ILWIS 3.4 software while river flood hazard map was made up incorporating elevation, slope and river characteristics using hydrological tools (HEC-geo RAS and HEC-RAS) in ArcGIS 10 software. Those hazard maps were then utilized to determine element of  risk covering vegetation and built up areas. Result showed that tidal inundation started to happen in the western area dominated by fish ponds as the main element of  risk.When sea level rose up to 90 cm height, settlement areas were experiencing inundation by tidal flood. Ciasem River began to over flowwhen the river discharge exceeded 160 m³/sec and inundated the paddy fields, fish ponds and settlements. This study indicated that fish ponds and paddy fields having high vulnerability to the flood event while that of  settlements and roads depend on the construction materials. Flood disaster risk should be reduced by continuing the land rehabilitation activity, restoring mangrove vegetation, implementing government regulations on management and establishment of  aquaculture in mangrove, and carefully considering  the construction of  coastal protection barriers.

Keywords

hazard map, river flood, tidal flood, vulnerability map, watershed

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References

Abidin, H. Z., & Sutrisno. (1992). Geologic map of the Pamanukan Quadrangle, Jawa 1209-6. Bandung: Geological Research and Developments Centre.

Appelquist, L. R., & Balstrøm, T. (2014). Application of the Coastal Hazard Wheel methodology for coastal multi-hazard assessment and management in the state of Djibouti. Climate Risk Management, 3, 79–95. doi:10.1016/j.crm.2014.06.002

Balai Besar Wilayah Sungai (BBWS) Citarum. (2007). Detail design of Ciasem River flood control infrastructure in Subang District (in Bahasa Indonesia).Report. Bandung: BBWS Citarum

Ellegaard, M., Nguyen, N. T. G., Andersen, T. J., Michelsen, A., Nguyen, N. L., Doan, N. H., … Lund-Hansen, L. C. (2014). Temporal changes in physical , chemical and biological sediment parameters in a tropical estuary after mangrove deforestation. Estuarine, Coastal and Shelf Science, 142, 32–40. doi:10.1016/j.ecss.2014.03.007

Hartanto, P., Nurmaulia, S. L., Prijatna, K., Geodesi, T., Ilmu, F., Fitb, K., … Itb, F. (2013). Steric and eustatik effect contributions to sea level change based on altimetry satellite argo and grace satellite data within 1992-2012 period (The Study Area : The Western Pacific Ocean) Kontribusi Efek Eustatik dan Sterik Terhadap Perubahan Muka Air. Indonesian Journal of Geospatial , 1(2), 1–16.

Hashim, A. M., & Catherine, S. M. P. (2013). A laboratory study on wave reduction by mangrove forests. APCBEE Procedia, 5, 27–32. doi:10.1016/j.apcbee.2013.05.006

Hildaliyani, U. (2011). Analysis of tidal flood inundation area on the north coast of Jakarta using SPOT and ALOS imagery data(in Bahasa Indonesia). Bogor: Departmen of Geophysic and Meteorology, FMIPA-IPB.

Ibharim, N. A., Mustapha, M. A., Lihan, T., & Mazlan, A. G. (2015). Mapping mangrove changes in the Matang mangrove forest using multi temporal satellite imageries. Ocean and Coastal Management, 114, 64–76. doi:10.1016/j.ocecoaman.2015.06.005

Mardiatno, D., Marfai, M.A., Rahmawati, K., Tanjung, R., Sianturi, R.S., & Mutiarni, Y. S. (2012). Flood and tidal flood multirisk assessment in Pekalongan Utara Sub District (in Bahasa Indonesia). Yogyakarta: Faculty of Geography UGM.

Munji, C. A., Bele, M. Y., Nkwatoh, A. F., Idinoba, M. E., Somorin, O. A., & Sonwa, D. J. (2013). Vulnerability to coastal flooding and response strategies: The case of settlements in Cameroon mangrove forests. Environmental Development, 5(1), 54–72. doi:10.1016/j.envdev.2012.10.002

Nurmaulia, S. L., Prijatna, K., Darmawan, D., & Sarsito, D. A. (2005). Preliminary study of sea level changein the sea of Indonesia based on Topex satellite altimetry 1992-2002 (in Bahasa Indonesia). Bandung: Scientific group of Geodesy, Faculty of Civil and Environmental Engineering, ITB.

Ristianto. (2011). Coastal vulnerability to the sea level rise (Master’s Thesis) (in Bahasa Indonesia). Universitas Indonesia, Jakarta.

SIPLA. (2012). Watersheed (in Bahasa Indonesia). Retrieved, from www.sipla.pksplipb.or.id on 3 September, 2012

Soraya, D., Suhara, O., & Taofiqurohman, A. (2012). Shoreline changes due to mangrove forest damage in the Blanakan and Legonkulon sub district, Subang (in Bahasa Indonesia). Jurnal Perikanandan Kelautan, 3(4), 355–364.

Sutter, F. C. (2008). San clemente dam seismic safety project: environmental impact statement. USA: United States Army Corps of Engineers.

Valiela, I., Bartholomew, M., Giblin, A., Tucker, J., Harris, C., Martinetto, P., … Stone, T. (2014). Watershed deforestation

and down-estuary transformations alter sources, transport, and export of suspended particles in Panamanian mangrove estuaries. Ecosystems, 17(1), 96–111. doi:10.1007/s10021-013-9709-5

Webster, T.L., & Forbes, D. L. (2006). Airbornne laser altimetry for predictive modeling of coastal storm-surge flooding. In L.L. Richardson & E.F. LeDrew (Eds.), Remote sensing of aquatic coastal ecosystem processes (pp. 157–182). Springer Netherlands.

Wilisandy, G., & Saputro, H. (2006). Study of coastal erosion mitigation planning in Slamaran, Pekalongan City (in Bahasa Indonesia). Semarang: Department of Civil Engineering, Faculty of Engineering, Universitas Diponegoro.

DOI: http://dx.doi.org/10.20886/ijfr.2017.4.1.37-48

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