Analisis Potensi Land Subsidence Akibat Penurunan Muka Air Tanah di Daerah Amurang

Abstrak

Land subsidence is a gradual or sudden decrease in the surface of the land due to the movement of material below the earth's surface. The impacts of land subsidence include damage to infrastructure, expansion of flood areas, increased coverage of tidal floods and sea water intrusion.  Amurang City is the capital of the district which is a strategic area for the economy.  Previous research shows that the subsurface conditions in the Amurang area are dominated by clay rocks that have been saturated by salt water and in the form of alluvial rocks formed from delta sedimentation, topsoil and mud. This information is supported by its location on the coast and river estuaries where groundwater use by the majority of the population has the potential to experience land subsidence.

The research was carried out by analyzing drill log data at the research location and groundwater levels from nearby monitoring wells. From the results of modeling using Plaxis 2 D with the assumption of a decrease of 0.09 m per year, over a period of 10 years the land surface subsidence was 3.24 cm. The faster the groundwater level decreases, the higher the land subsidence that occurs. It is hoped that the results of this research can be a reference in managing groundwater use in local areas to anticipate potential disasters.