Prediction of time-lapse microgravity value based on groundwater change map in 2003 - 2010 at Dayeuhkolot industrial area, Bandung

Abstract

Changes in groundwater levels in the indutrial area were seen on ground air maps from the Directorate of Environmental Geology in 2003 and 2010. Digitization of groundwater level maps was carried out and then the changes were analyzed for getting the volume of water used. Time-lapse microgravity is sensitive to density changes. To get the value of density changes of groundwater, we need information such as rock porosity and water density. In this case we assumed that the porosity value is 30% and the water density value is 1 gr / cc, so the value of water density changes is 0.3 gr/cc. The value of density changes is distributed across the entire volume of groundwater changes during 2003 to 2010. The volume of groundwater changes in interval 2003 to 2010 was around 33,971,200 m3. From calculation of time-lapse microgravity for geometry the reduction of groundwater in the Dayeuhkolot industrial area shows the highest value about -125 microGal. The time-lapse microgravity of the Dayeuhkolot industrial area during 2003 to 2010 shows a value -125 microGal which is very detectable with a gravimeter like Scintrex CG-5 which has accuracy up to 1 microGal.

Reconstruction of Bandung Groundwater Basin Model Using Schlumberger Configuration Geoelectric Method

“…Groundwater is an essential component in people's lives. Without groundwater with pristine water quality, many problems will occur, ranging from health to the community's economy [1]. Groundwater conditions are strongly influenced by the rate of population growth in the area [1], [2].…”

“…Without groundwater with pristine water quality, many problems will occur, ranging from health to the community's economy [1]. Groundwater conditions are strongly influenced by the rate of population growth in the area [1], [2]. One of the areas with a very rapid pace of development in the development sector is the city of Bandung.…”

“…One of the areas with a very rapid pace of development in the development sector is the city of Bandung. This condition causes the need for clean water to be critical to be studied [1].…”

“…The literature study that has been carried out provides data that there are 550 industries in the Bandung Basin and 80% of them are textile industries that require much groundwater as industrial material. This problem continues to cause land subsidence, especially in the Dayeuhkolot industrial area [1]. The development of residential and industrial areas that ignore water catchment is also a problem for the Bandung Basin.…”

“…The development of residential and industrial areas that ignore water catchment is also a problem for the Bandung Basin. Every time it rains, which produces large runoff water does not enter the ground, it collects and causes flooding [1], [6]- [9].…”