Land Subsidence Assessment Using the D-InSAR Method in Siak Regency, Riau, Indonesia
Santika Tristi Maryudhaningrum (a*), Giri Bayuaji (b)

a) Faculty of Exploration and Production Technology, Pertamina University, Indonesia
*santika.tristi[at]universitaspertamina.ac.id
b) Faculty of Earth Science and Technology, Bandung Institute of Technology, Indonesia

Abstract

Land subsidence is a phenomenon in which the land surface slowly or rapidly decreases, often caused by natural or anthropogenic factors. The phenomenon of land subsidence has occurred in several regions in Indonesia with various causes. Siak Regency is an area characterized by extensive peatlands with an average thickness of 3-5 meters and high water content. This condition makes the soil highly susceptible to hydrocompaction processes, which occur due to excessive water loss, and can contribute to the occurrence of natural land subsidence. In this area, the phenomenon of land subsidence has had several impacts, including damage to existing infrastructure and the destruction of vegetation. This study aims to identify and map the distribution of land subsidence in Siak Regency using the D-InSAR analysis. In this study, Sentinel-1A was used to determine the rate of land subsidence. The study^s results showed that land subsidence occurred in several sub-districts, with subsidence rates exceeding 4 cm/year at certain points. These findings make a significant contribution to the field of remote sensing-based geohazard monitoring, particularly in tropical lowland regions. The spatial information generated can be the basis for efforts to mitigate the risk of land subsidence and support the formulation of more adaptive and sustainable regional development policies.

Keywords: D-InSAR- hydrocompaction- land subsidence- mitigation- Siak

Topic: Topic B: Applications of Remote Sensing