Analysis and Monitoring of Land Subsidence Phenomena in Tambak Lorok, Semarang City Using the In-sar Method
DOI:
https://doi.org/10.15294/jtsp.v26i1.27692Keywords:
Land Subsidence, InSAR, Sentinel-1A, SNAP, Digital Elevation Model, Watershed (DAS), Tambak LorokAbstract
Rapid urbanization and infrastructure expansion in Semarang, particularly in the northern coastal areas, have led to significant land subsidence. Tambak Lorok, located in Tanjung Mas Sub-district, is among the affected areas, with key contributing factors including soft young alluvial soils, excessive groundwater extraction, infrastructure loads, coastal sediment dynamics, and tidal fluctuations. To understand the patterns and rates of land subsidence, this study employs the Interferometric Synthetic Aperture Radar (InSAR) method using the Sentinel Application Platform (SNAP).
The methodology involves the analysis of Sentinel-1A satellite imagery (2020–2024), Digital Elevation Model (DEM) mapping, and examination of changes in watershed (DAS) areas. Additional data were gathered through local community interviews and analysis of Google Maps and DEM data from 2018–2024. Long-term InSAR monitoring reveals that certain areas in North Semarang's coastal zone are subsidining at rates between -0.16 to -0.23 meters per year. Data validation was conducted through triangulation to ensure result accuracy.
These findings highlight the need for more effective mitigation strategies, such as stricter groundwater management, adaptive infrastructure upgrades, and spatial planning that considers subsidence risks. Furthermore, remote sensing technology should be complemented with ground-based monitoring to ensure more accurate and data-driven mitigation strategies. The outcomes of this research are expected to serve as a basis for disaster mitigation and sustainable coastal spatial planning
Downloads
References
A., Ilfiyaningrum, A., Kusumawardani, R., Savanti, F., Setyohadi Kuswarna Putra, B., Aida, N., Biela Simanungkalit, R., Ayu Praditya Ning Putri, G., & Inas Saraswati, Z., Scientific Application of Technology. (n.d.) (2023). APTEK JOURNAL Estimation of Land Subsidence Using the Differential Interferometry Synthetic Aperture Radar (Dinsar) Method in Pantura, Semarang City. https://doi.org/10.30606/aptek.v16i1.2193
American Association of State Highway and Transportation Officials. (1967).AASHTO standard specifications for highway materials and methods of sampling and testing (8th ed.). American Association of State Highway and Transportation Officials.
Baillie, I. C. (2001b). Soil Survey Staff 1999, Soil Taxonomy. Soil Use and Management,
7(1), 57–60. https://doi.org/10.1111/j.1475-2743.2001.tb00008.x
Budianto, E. (2016). Land subsidence on the north coast of Java, Village Bandarharjo and its surroundings, Semarang City, Central Java. Journal of Geoscience.
SINGLE. (2015/2012). Sentinel-1. European Space Agency.
Galloway, D. L., Jones, D. R., & Ingebritsen, S. (1999). Land subsidence in the United States. U.S. Geological Survey Circular. https://doi.org/10.3133/cir1182
Ministry of Public Works and Public Housing (PUPR). (2021). Geotech Guide-nik: The formation process and basic properties of soft soils. Retrieved from https://binamarga.pu.go.id
Lisa N. I., at al, "Analysis of Land Decline in Semarang City Survey Method Gnss Year 2019", Undip Geodesy Journal, Volume 9, Number 2, Year 2020, (ISSN :2337-845X)
Pramono, I. B. (2021). Nature-based solutions for integrating flood and land subsidence: A case study in Jakarta and Semarang. IOP Conference Series Earth and Environmental Science, 874(1), 012001.https://doi.org/10.1088/1755-1315/874/1/012001
Pujiastuti, R., Suripin, S., & Syafrudin, S. (2016). The Effect of Land Subsidence on Gena-only Flood and Rob in East Semarang. SIPIL TECHNICAL COMMUNICATION MEDIA, 21(1), 1. https://doi.org/10.14710/mkts.v21i1.11225