City Development and Land Succes Problems in River Delta Areas

In recent years, the decrease in swamp land has been observed in both urban and rural areas. This phenomenon is land hoarding to the deliberate drainage practices which focused on rendering the land suitable for residential and infrastructure purposes and facilitating economic growth. The landfilling causes oxidation of the peatlands due to the influence of oxygen, which causes soil subsidence. Land subsidence poses a significant risk to buildings and residents in affected zones. This study aims to investigate and understand the spatiotemporal patterns of land subsidence in sub-optimal terrain, particularly in areas affected by drainage and human activities. Mapping and monitoring the impact of land subsidence on infrastructure plays a crucial role in identifying vulnerable areas prone to threats. The observation of land subsidence was conducted using two methods. The first involved the utilization of the Global Positioning System (GPS), which was a standard and dependable technique for monitoring deformation. The second method employed the Interferometric Synthetic Aperture Radar (InSAR), which provided precise detection of subsidence over expansive areas. To map spatiotemporal land subsidence phenomena in Palembang City, a combination of research utilizing the InSAR time-series analysis and various data sources such as JERS-1, Radarsat, Sentinel-1, and ALOS PALSAR with high spatial and temporal resolution, along with GPS observations was conducted. Analysis of a ten-year InSAR time-series data (October 10,2014 -August 31, 2023) showed a decrease of approximately 53,2 cm. These findings are expected to provide insights into the relationship between subsidence-prone areas, nearby rivers, and landslide phenomena.