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Seawater intrusion mapping using hydrochemical ionic ratio data: an application in northern part of Jakarta groundwater basins, Indonesia

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Abstract

Groundwater is the most important freshwater source in Jakarta for household and industry use. Along with the massive growth of population and industry in Jakarta, it has lead to excessive groundwater extraction, and in the end, it causes other problems such as land subsidence and sea water intrusion. Unfortunately, the extend of the seawater intrusion in the coastal part of Jakarta groundwater basin has not explained well. The purpose of this research was to establish the map of seawater intrusion in the northern part of Jakarta groundwater basin. This study used five parameter ionic ratios to determine seawater intrusion. This approach has advantages in terms robustness of processing and data analysis but is still powerful in determining seawater intrusion in the Jakarta groundwater basin. Hydrochemical data were collected from dug wells and monitoring wells in order to characterize the hydrochemical facies of the study area. Eighty-eight (88) groundwater samples were taken from dug well and monitoring well. Some of the groundwater sample has Cl concentrations > 2386 mg/L and EC value with (> 1000 μS/cm), suggesting seawater intrusion already occurred. This data has been confirmed with ionic ratio where area with seawater intrusion shows higher ratio than area that was not affected by the seawater intrusion. Ionic ratio criteria were overlay to create seawater intrusion map (SWIM). The most extreme salinization occurs in the northern, northwestern, and eastern sections of this study area. From 2015 to 2017, the pattern of seawater intrusion map varies greatly. This research shows that the use of ionic ratio method is efficient tools in mapping of seawater intrusion. Apart from that, this research will be a consideration for stakeholders in groundwater management, especially in the northern part of the Jakarta groundwater basin to conserve groundwater sustainability.

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Acknowledgements

The authors are gratefully acknowledge the Director of Groundwater Conservation Division, Ministry of Energy and Mineral Resources Indonesia for his willingness to provide the data for our analysis and Director of Research Center for Limnology and Water Resources, National Research and Innovation Agency of Indonesia (LiSDA-BRIN) for discussion and facilitate this research. Special thanks to the reviewers and the Editor for their useful comments that helped to improve this paper. This study was financially supported by the COREMAP-CTI project 2021–2022.

Funding

This research was financially supported by the COREMAP-CTI project 2021–2022.

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Gumilar Utamas Nugraha, Hendra Bakti, Rachmat Fajar Lubis, and Andi Agus Nur. The first draft of the manuscript was written by Gumilar Utamas Nugraha, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Gumilar U. Nugraha.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Responsible Editor: Broder J. Merkel

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Nugraha, G.U., Bakti, H., Lubis, R.F. et al. Seawater intrusion mapping using hydrochemical ionic ratio data: an application in northern part of Jakarta groundwater basins, Indonesia. Arab J Geosci 15, 1575 (2022). https://doi.org/10.1007/s12517-022-10861-5

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  • DOI: https://doi.org/10.1007/s12517-022-10861-5

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