Spatio Temporal of Recent Land Subsidence in Jakarta Heri Andreas, Dina A. Sarsito, Hasanuddin Z. Abidin, Dhota Pradipta, Angga Trysa Yuherdha
Institute of Technology Bandung
Abstract
Land subsidence in a certain area is very dynamic, both spatially and temporally. Spatially, it means how widely land subsidence occurs and where it occurs. Meanwhile, temporally it means when it occurs, whether the subsidence rate is extreme or small. This dynamic behavior will determine the impact of the disaster and disaster management efforts. For example, if we found the extreme rate of land subsidence on the coast, in this case they will cause some coastal areas to become lower than sea level through times and coastal inundation will occurred. Another example is when one place has a higher subsidence rate than its neighbors, it will cause differential subsidence which further causes some damage to infrastructure. The impact from both conditions of extreme rates and differential subsidence of course must be managed well. If we see Jakarta area, the city is recorded experiencing land subsidence very serious with the impact already being a disaster, especially in the form of coastal inundation and wider expansion of fluvial floods. Spatially, areas that are experiencing significant of subsidence are the coastal areas. Meanwhile, it was recorded that in the mid to late 2000s the rate of land subsidence was very significant in many places, with some even reached 26 cm/year. As mentioned above, the dynamic spatio-temporal behavior of subsidence will determine the impact of a disaster and its management efforts. For this reason, it is very important to look at the spatio and temporal of recent subsidence in Jakarta. This paper will explore it. From the results of the data analysis, it is shown that in general the rate of subsidence in Jakarta is slowing while on the one hand, spatially there is a growth in subsidence in buffer areas of the city such as Tanggerang and Bekasi. This situation shows good news for Jakarta but bad news for the buffer area.
Keywords: Land subsidence, spatio, temporal, recent, Jakarta
