Abstract
Groundwater has a very important role both in terms of environmental, social and economic. The consumption of groundwater continuously can affect the physical condition of the environment such as land subsidence, especially in Semarang City. The spatial correlation of land subsidence and water table changes was analyzed in this study using remote sensing and geographic information systems. PS-InSAR method is used to process Sentinel-1 SAR image satellite to get the result of land subsidence during in 2014-2017. The annual average of vertical land subsidence in Semarang City, with the range 0 ± 3.4 cm to 4.5 ± 3.4. The spatial relation between the land subsidence and the water table decreased is obtained using the rules of the spatial correlation matrix. The study area was dominated by a very high correlation with the percentage (47.58%), which located in several areas in Genuk District, Tembalang District, Pedurungan District, Tugu District and Mijen District. The potential of groundwater in unconfined aquifers in Semarang City is nihil potential and low potential of groundwater quality. The very high correlation between land subsidence and water table decreased, which located in the low potential of groundwater in unconfined aquifer mostly located in Tembalang District.
Highlights
Groundwater is one of the essential human needs, that is located below the earth’s surface and is stored in the geologic formations
PS-InSAR method is used to extract the results of vertical land subsidence in study areas
The unfulfillment of the deformation point caused the interpolation in the northern coastal area in the west of Semarang City referring at the under point of deformation so in that coastal has increased of land surface
Summary
Groundwater is one of the essential human needs, that is located below the earth’s surface and is stored in the geologic formations. The groundwater that are mostly utilized by the people for various purposes located at the depth of 1-25 meters below the earth’s surface and is the main source of clean water used as the fulfilment of human needs. The spatial relation between land subsidence and watertable changes in unconfined aquifer is described in this study using remote sensing technology and geographic information systems. The results of this study to analyze the level of spatial correlation between the vertical land subsidence and the decrease of the water table located in several types of unconfined aquifers. The analysis in each type of aquifer aims to determine the potential condition of groundwater that has a level of spatial correlation from low to high between the vertical land subsidence and the decrease of the water table. The groundwater basin area consist of several aquifers types that are classified based on groundwater quality and quantity
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