Open AccessIdentification of Subsurface Water Flow Using Gradient Horizontal Gravity Data in Tanjung Priok and Koja, North Jakarta
Author(s) -
Gita Puspa Ayu,
Mohammad Syamsu Rosid,
Fajar Bahari Kusuma
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1351/1/012093
Subject(s) - aquifer , groundwater , geology , groundwater flow , contour line , bouguer anomaly , saltwater intrusion , salinity , residual , flow (mathematics) , hydrology (agriculture) , gravity anomaly , geotechnical engineering , petroleum engineering , geography , meteorology , geometry , oceanography , mathematics , algorithm , oil field , computer science
The presence of saline or salt water in the Jakarta groundwater aquifer is still widely debated by various geologists and groundwater experts. This study intends to identify the cause of the high salinity of groundwater at Tanjung Priok and Koja, North Jakarta. The First Horizontal Derivative (FHD) method of gravity data is applied to identify the direction of subsurface fluid flow. It is also supported by groundwater sample data and self potential (SP) data. The direction of fluid flow on the FHD contour map is indicated from low to high FHD value. From gravity data, Bouguer density values obtained in the study area were 2.12 gr/cm 3 . This study focuses on surface aquifers so that it is necessary to separate regional and residual anomalies. The results show that the direction of fluid flow is from north to south, there is a high FHD value that is distributed around the coordinates (709000, 9322000) which may indicate as the salt depositions of sea water intrusion.