Enviromental Monitoring of Land Subsidence in The Coastal Area of Padang City Using Sentinel 1 Sar Dataset

Abstract

The land surface in the Padang City is thought to be experiencing a continuous relative subsidence due to natural processes and man-made activities. Factors that affect land subsidence include earthquakes, sea level rise, infrastructure development, sediment transport, and excessive use of groundwater sources. The purpose of this research is to map the rate of land subsidence which is processed from the Sentinel 1-A radar, satellite imagery using the Differential Synthetic Aperture Radar (DInSAR) method. The data used are two pairs of Sentinel-1A level 1 Single Looking Complex (SLC) imagery which were acquired in 2018 and 2019. Image processing is carried out by filtering and multilooking techniques on Synthetic Aperture Radar (SAR) images. The following process changes the phase unwrapping to the ground level phase using phase displacement. Land subsidence in 2018–2019 from DInSAR processing reached -10.5 cm / year. The largest land subsidence occurred in North Padang with an average of -7.64 cm/year. Land subsidence in the Padang City, which is located near the estuary, is due to the nature of the alluvial sediment material. The use of Sentinel 1 SAR remote sensing data can provide important information in the context of mitigating land subsidence in the Padang City. Therefore, we need the right policies to handle future land subsidence cases. Land subsidence mapping is one of the factors that determine the vulnerability of coastal areas to disasters

Identification of Sea Level Rise and Land Subsidence Based on Sentinel 1 Data in the Coastal City of Pekalongan, Central Java, Indonesia

“…This study uses the DInSAR method to determine how much the land surface changes in the coastal area of Pekalongan. The DInSAR method is used to see changes in the baseline in SAR data so that the phase difference can later be reduced to a change, meaning that the information contained in the interferometric phase is calculated as the phase difference between two SAR images obtained at two different times but at almost the exact location (Fajrin et al, 2021). DInSAR can be processed using SNAP software developed by the European Space Agency (ESA) (Mandal et al, 2019).…”

Memperkirakan Penurunan Tanah Menggunakan Data Sentinel 1 Sar Diberbagai Tipe Penggunaan Lahan Di Kota Padang

“…Dampak negatif ini dapat diperburuk oleh perubahan iklim (misalnya, kenaikan permukaan laut), terutama di daerah pesisir dataran rendah (Shirzaei et al, 2021). Beberapa wilayah kota di Indonesia pernah mengalami penurunan muka tanah seperti Jakarta, Semarang, Bandung, Surabaya, Lampung dan Padang (Abidin et al, 2011;Anjasmara et al, 2020;Bott et al, 2021;Du et al, 2018;Fajrin et al, 2021;Hakim et al, 2020;Widodo et al, 2021;Zaenudin et al, 2018).…”

“…Kota Padang hampir tidak memiliki database yang mencakup skala spasial temporal penurunan tanah untuk penanganan masalah penurunan tanah di masa mendatang (Fajrin et al, 2021). Pentingnya deteksi dini terkait penurunan tanah di kawasan tersebut, selain sebagai kota yang rawan bencana.…”

“…Pentingnya deteksi dini terkait penurunan tanah di kawasan tersebut, selain sebagai kota yang rawan bencana. Kota Padang juga diprediksi akan mengalami pertumbuhan penduduk perkotaan yang pesat dan kemungkinan perluasan wilayah kota (Fajrin et al, 2021). Pertumbuhan penduduk dapat menyebabkan perubahan penggunaan lahan dan dapat meningkatkan penggunaan air terutama air tanah, penggunaan air tanah yang berlebihan dapat mempengaruhi keseimbangan air tanah sampai batas tertentu dan menyebabkan evolusi penurunan tanah (Abidin et al, 2015;Rahmati et al, 2019).…”

The Potential Impact of Rising Sea Levels and Subsidence on Coastal Flooding Along the Northern Coast of Saint-Louis, Senegal

“…Subsidence in these cities will become increasingly important as they concentrate a significant proportion of the world's population, infrastructure and investment, especially in the context of climate change. Recent studies by [5,16,17] index subsoil mining and rapid coastal urbanization as driving factors for subsidence. Many authors have established a linear relationship between subsidence and sea-level rise.…”