Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia
Seawater intrusion contaminates freshwater in coastal areas, disrupting the environment and posing health risks due to high chloride content. Monitoring and mapping the seawater-freshwater interface is essential for evaluating and mitigating the environmental damage caused by this phenomenon. A wide...
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| Format: | Article |
| Language: | English |
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Elsevier
2026-02-01
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| Series: | Geosystems and Geoenvironment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772883825000883 |
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| author | Vitasha Adha Chaerul I Gede Putu Fadjar Soerya Djaja Prihandhanu Mukti Pratomo Supriyadi Elfitra Desifatma Anggie Susilawati Dini Andriani Harry Mahardika Eleonora Agustine Wahyu Srigutomo |
| author_facet | Vitasha Adha Chaerul I Gede Putu Fadjar Soerya Djaja Prihandhanu Mukti Pratomo Supriyadi Elfitra Desifatma Anggie Susilawati Dini Andriani Harry Mahardika Eleonora Agustine Wahyu Srigutomo |
| author_sort | Vitasha Adha Chaerul |
| collection | DOAJ |
| description | Seawater intrusion contaminates freshwater in coastal areas, disrupting the environment and posing health risks due to high chloride content. Monitoring and mapping the seawater-freshwater interface is essential for evaluating and mitigating the environmental damage caused by this phenomenon. A widely used geophysical technique for mapping is the transient electromagnetic (TEM) method, which detects seawater intrusion by leveraging the significant resistivity differences between saline water, freshwater, and other geological layers.This study utilized 21 TEM sounding points at Santolo Beach, Garut, West Java, Indonesia. The data were processed through an iterative inversion procedure using a smoothness constraint scheme. Interpretation of the transient magnetic field across all sounding points revealed a resistivity structure comprising three main layers: (1) a surface layer with high resistivity (>50 Ωm) extending to a depth of 15 m and thinning as it moves away from the coastline; (2) a middle layer with moderate resistivity (5–50 Ωm), ranging from 15 m to 40 m and thickening inland; and (3) a conductive layer, identified as seawater intrusion, with low resistivity (<5 Ωm), situated >40 m deep and deepening farther from the coastline. Additionally, water quality at several TEM sounding points was assessed using parameters such as total dissolved solids (TDS), electrical conductivity (EC), pH, and water temperature. The findings indicate that surface water in the area, obtained from wells and swamps, meets the required quality standards for potable water. |
| format | Article |
| id | doaj-art-097eae2c721645d2a996b8b0ff809869 |
| institution | Kabale University |
| issn | 2772-8838 |
| language | English |
| publishDate | 2026-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geosystems and Geoenvironment |
| spelling | doaj-art-097eae2c721645d2a996b8b0ff8098692025-08-20T04:01:03ZengElsevierGeosystems and Geoenvironment2772-88382026-02-015110044010.1016/j.geogeo.2025.100440Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, IndonesiaVitasha Adha Chaerul0I Gede Putu Fadjar Soerya Djaja1Prihandhanu Mukti Pratomo2 Supriyadi3Elfitra Desifatma4Anggie Susilawati5Dini Andriani6Harry Mahardika7Eleonora Agustine8Wahyu Srigutomo9Physics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaGeophysics Department, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl. Raya Bandung Sumedang KM. 21 Jatinangor 45363, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, IndonesiaGeophysics Department, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl. Raya Bandung Sumedang KM. 21 Jatinangor 45363, IndonesiaPhysics of Earth and Complex Systems, Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132, Indonesia; Corresponding author.Seawater intrusion contaminates freshwater in coastal areas, disrupting the environment and posing health risks due to high chloride content. Monitoring and mapping the seawater-freshwater interface is essential for evaluating and mitigating the environmental damage caused by this phenomenon. A widely used geophysical technique for mapping is the transient electromagnetic (TEM) method, which detects seawater intrusion by leveraging the significant resistivity differences between saline water, freshwater, and other geological layers.This study utilized 21 TEM sounding points at Santolo Beach, Garut, West Java, Indonesia. The data were processed through an iterative inversion procedure using a smoothness constraint scheme. Interpretation of the transient magnetic field across all sounding points revealed a resistivity structure comprising three main layers: (1) a surface layer with high resistivity (>50 Ωm) extending to a depth of 15 m and thinning as it moves away from the coastline; (2) a middle layer with moderate resistivity (5–50 Ωm), ranging from 15 m to 40 m and thickening inland; and (3) a conductive layer, identified as seawater intrusion, with low resistivity (<5 Ωm), situated >40 m deep and deepening farther from the coastline. Additionally, water quality at several TEM sounding points was assessed using parameters such as total dissolved solids (TDS), electrical conductivity (EC), pH, and water temperature. The findings indicate that surface water in the area, obtained from wells and swamps, meets the required quality standards for potable water.http://www.sciencedirect.com/science/article/pii/S2772883825000883Transient electromagnetic surveySeawater intrusionWater qualitySantolo beach |
| spellingShingle | Vitasha Adha Chaerul I Gede Putu Fadjar Soerya Djaja Prihandhanu Mukti Pratomo Supriyadi Elfitra Desifatma Anggie Susilawati Dini Andriani Harry Mahardika Eleonora Agustine Wahyu Srigutomo Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia Geosystems and Geoenvironment Transient electromagnetic survey Seawater intrusion Water quality Santolo beach |
| title | Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia |
| title_full | Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia |
| title_fullStr | Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia |
| title_full_unstemmed | Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia |
| title_short | Identifying seawater intrusion in coastal areas using the transient electromagnetic method at Santolo Beach, Garut, West Java, Indonesia |
| title_sort | identifying seawater intrusion in coastal areas using the transient electromagnetic method at santolo beach garut west java indonesia |
| topic | Transient electromagnetic survey Seawater intrusion Water quality Santolo beach |
| url | http://www.sciencedirect.com/science/article/pii/S2772883825000883 |
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