Marine Resistivity Tomography for imaging the underwater sedimentation in North Java Sea Bagus Endar B. Nurhandoko (1,3), Syukri Fitrialdi(2), Kaswandhi Triyoso (3), Satryo Agung Wibowo(3), Insan Rizal Komara(3), Wisnu Guntara(3), Diah Asmawati(3), Gogot Panca Parijogo(2), Ratih Pratiwi(1), Maria Cindrawati(1), and Eko B. Supriyanto (3)
1) Physics Department of Institut Teknologi Bandung
2) Taka Hydro Core Indonesia
3) LPIK ITB-
Abstract
The North Java Sea coast suffers abrasion and siltation phenomena. This abrasion phenomenon has become intense in the last decades on the shore of the North Java Sea. Some authors said abrasion has occurred over the last 50 years, especially in the Eretan, Indramayu, and Cirebon districts. On the other hand, the coastal area of the North Java sea has crowded infrastructures, namely roads and oil-gas pipelines, and has highly populated areas.
We acquired data from marine resistivity tomography to image submarine sedimentation around Eretan and Cirebon coasts. The marine resistivity tomography data acquisition is carried out to image the underwater offshore of the Eretan coast and the Cirebon coast. The underwater resistivity information can be used for corrosion protection and imaging of the sedimentation layer. The subsurface results from marine resistivity tomography can also map the hard and soft layer position distribution. Suppose the results of this imaging are correlated with wells or the Rock Physics analysis. They will be able to map the distribution of subsurface lithology. Therefore, in the future, these results can be used for studies on handling abrasion and designing underwater infrastructure.
We use some configurations of measurements for marine resistivity tomography: static and dynamic measurement. The static measurement uses Wenner-Alpha configuration and Wenner-Schlumberger. The dynamic measurement, measured while moving the ship, uses the inverse of the Schlumberger measurement. The result shows the presence of a high resistivity layer in the subsurface of the seabed, which may be an as hard layer in the subsurface of the seabed of Eretan bay.
