3D RESISTIVITY IMAGING AND PRECIPITATION DATA TO PREDICT SEAWATER INTRUSION IN TANAH MAS INDONESIA

Authors

  • Supriyadi
  • Andya Satya Purnomo Putro
  • Khumaedi
  • Cherly Salawane

Keywords:

Resistivity, Precipitation, Seawater, Intrusion

Abstract

The seawater intrusion into the shallow groundwater in Tanah Mas residential North
Semarang was predict by 3D resistivity imaging and precipitation data. The seawater intrusion was
investigated by resistivity survey which generated by multi-electrode system with sixteen electrodes
configuration. Analysis of rainfall data will show how much the influence of groundwater pressure from
rainfall in the study area to the saltwater interface. The result of precipitation data indicates very low medium
rainfall, with 0.6 mm for October 126.1 mm for November. In October, the coastal aquifer will be so pressed
by salt water that sea water intrusion penetrates into freshwater areas. In November, the coastal aquifers are
recharged by precipitation and replenished water flowing to the sea then prevent saltwater from encroaching
into the area of freshwater. The resistivity survey detected the presence of seawater intrusion because it has a
small resistivity range between 0.120-0.980 Ωm at a depth about 13.5 m to 26.9 m. 3D resistivity images
show the distribution of seawater intrusion in the Tanah Mas area in horizontal and vertical direction. The
distribution of seawater intrusion has reached northern, eastern and southern part of Tanah Mas area.

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Published

2020-12-28

How to Cite

Supriyadi, Andya Satya Purnomo Putro, Khumaedi, & Cherly Salawane. (2020). 3D RESISTIVITY IMAGING AND PRECIPITATION DATA TO PREDICT SEAWATER INTRUSION IN TANAH MAS INDONESIA. GEOMATE Journal, 19(76), 76–81. Retrieved from https://geomatejournal.com/geomate/article/view/1060