Prediction of Land Subsidence on The North Coast of West Java in 2017-2021 Based on DInSAR Data Arin Afina Sulia (1) and Dian Noor Handiani (1)
1) Deparment of Geodetic Engineering, Faculty of Civil Engineering and Planning, Institut Teknologi Nasional, Jl. PH.H. Mustofa No.23, Bandung 40124, Indonesia
Abstract
Land subsidence is a geological phenomenon causing downward land displacement relative to the reference point of the ground^s surface. The impact of land subsidence can threaten the environment, such as damaging infrastructures and buildings, performing soil cracks, and increasing flood risk. These conditions are threatening community settlement and their economic activities. This study aims to map and calculate how large land subsidence is on the North Coast of West Java using the Differential Interferometry Synthetic Aperture Radar (DInSAR) method. The study uses Sentinel-1 data in the years 2017, 2018, and 2021 and the digital elevation model (DEM) of the Shuttle Radar Topography Mission (SRTM). The results show that land subsidence changes from the year 2017 to 2018 were up to 0.18 m/year, and it occurs in Cirebon Regency (Losari District), also Indramayu Regency (Pakisjaya District). Meanwhile, land subsidence changes from the year 2017 to 2021 were up to 0.15 m/year, and it occurs in Tempuran District in Karawang Regency. Compared to previous studies, we found that the North Coast of West Java area has experienced an increase in land subsidence, especially in Subang, Bekasi, Cirebon, and Indramayu Regencies. Hopefully, these results can help the local government and related agencies in developing an appropriate mitigation plan for land subsidence on the North Coast of West Java.
Keywords: North Coast of West Java, Land Subsidence, DInSAR, Sentinel-1
