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Geosciences 2018, 8(4), 130; https://doi.org/10.3390/geosciences8040130

A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island

1
Applied Geology Research Group, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Bandung 40132, Indonesia
2
Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI), Bandung 40135, Indonesia
3
Center for Groundwater Resource and Environmental Geology, Indonesian Geological Agency, 40122 Bandung, Indonesia
*
Author to whom correspondence should be addressed.
Received: 26 January 2018 / Revised: 25 March 2018 / Accepted: 4 April 2018 / Published: 8 April 2018

Abstract

Semarang-Demak and other cities along the coast of North Java are vulnerable to land subsidence. The presence of saline groundwater in the coastal region is thought to affect the high subsidence rate, in this case the compressibility of the aquitard layer. We aimed to analyze the effects of groundwater salinity on the compression characteristics of the Semarang-Demak clay using physical analysis. Methods included the determination of groundwater salinity, clay mineralogy and fabrics, and consolidation tests under various salinity conditions. The Semarang-Demak clay is dominated by smectite of high activity, and saline clay exists at the depth of 10 to 35 m. Consolidation tests revealed that the increase insalinity increases the average consolidation rate and hydraulic conductivity up to 42% and 37.5%, respectively. Clay fabric analysis showed that the groundwater salinity modified the interconnectivity of pores by changing the fabric into parallel alignments, facilitating faster porewater dissipation, hence the clay is more readily compressed. These findings are useful for explaining the mechanism of the fast-subsiding coastal plains of North Java. View Full-Text
Keywords: groundwater; salinity; clay; compressibility; Semarang-Demak groundwater; salinity; clay; compressibility; Semarang-Demak
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sarah, D.; Hutasoit, L.M.; Delinom, R.M.; Sadisun, I.A.; Wirabuana, T. A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island. Geosciences 2018, 8, 130.

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