Impact Analysis of Land Subsidence in The Coastal Area of The Metropolitan Rebana, West Java, Indonesia Wina Alvina Gunawan, Wiwin Windupranata
Geodesy and Geomatics Department, Research Group of Hydrography, Institut Teknologi Bandung Jl. Ganesha No. 10, Bandung-Indonesia
Abstract
Coastal areas are the highest level of vulnerability to disaster response due to direct release by sea and land. Land subsidence is a long-term disaster with a very broad pathway for coastal areas. The Rebana Metropolitan Area is one of the mega projects carried out by the Indonesian government, especially in West Java, to improve the economy which has caused development in this area to increase, in line with population growth and land conversion. It is feared that land subsidence will disrupt development and regional development. The accumulation of land subsidence, total population, and area occurring in each sub-district on the Rebana coast as many as 20 sub-districts will be taken into account. Specifically, land subsidence was identified using Radar data from Sentinel-1A imagery with 5 years of recording, while the settlements imposed, and the area of land built up use data from the Badan Pusat Statistik and land use data from Rupa Bumi Indonesia. The result is that the subsidence in the tambourine area is 7 cm/year while for the sub-district it is around 5-9 cm/year. The people who burned were 190 thousand hectares or 4.4% of the total population in the Coastal Area. The affected land cover is 30.000 hectares of ponds, 86.000 hectares of productive land, and 2 ports namely Patimban Port in Subang Regency and Cirebon Port in Cirebon City. The districts with the highest level of risk are in 2 sub-districts in the city of Cirebon, namely Lemah Wungkuk and Kapetakan, in other area is 1 sub-district in Cirebon Regency, namely Suranenggala sub-district.
Keywords: Land Subsidence, Radar, Rebana Metropolitan Area, Sentinel
