综合地电法识别南榜湾全第四纪海岸含水层盐水入侵

Q3 Environmental Science Applied Environmental Research Pub Date : 2022-09-29 DOI:10.35762/aer.2022.44.3.6
Rustadi, A. Setiawan, I. Darmawan, Suharno, Nandi Haerudin
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引用次数: 0

摘要

南榜湾全第四纪地层含水层地下水采掘增加,导致海水入侵。这一迹象出现在一些社区井中,并可能进一步向内陆蔓延。因此,本研究旨在确定咸水暴露区域的分布和非咸水暴露区域的边界,特别是在全新第四纪组。本研究采用地电法结合矿化度数据和四个钻孔点的土壤渗透试验(SPT)分析。利用斯伦贝谢的AB/2跨度达200米的配置,共获得了4条电阻率断层扫描(ERT)线和8个垂直电测深(VES)点。同时,从60个社区井中直接测量了盐度数据。ERT和VES分析结果表明,南榜湾沿海含水层深度为2 ~ 24 m。SPT分析发现了互层砂、粉砂和粘土,它们被解释为来自全第四纪地层的海相沉积。地下水仅在浅层含水层(小于24米)中,但经历了9-20欧姆之间的低电阻率海水入侵。高盐度值分布在距离海岸线1公里以上的地区,最高可达3100 ppm。此外,ERT结果强化了这一发现,显示浅层含水层的低电阻率值小于10欧姆。VES数据探测深度为12 ~ 13 m的低电阻率值(18 ω m)。
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Identification of Saline Water Intrusion Using Integrated Geoelectrical Method in the Coastal Aquifer of Holo-Quaternary Formation, Lampung Bay
Increased groundwater extraction from aquifers in Holo-Quaternary rock formations in Lampung Bay has caused saltwater intrusion. This indication appears in several community wells and can spread further inland. Therefore, this study aims to identify the distribution of areas exposed to saline water and the boundaries of areas that have not, especially in the Holo-Quaternary Formation. This research uses the geoelectric method integrated with salinity data and the Soil Penetration Test (SPT) analysis at four drilling points. A total of 4 lines of Electrical Resistivity Tomography (ERT) and 8 points of Vertical Electrical Sounding (VES) have been acquired with a Schlumberger configuration with an AB/2 span of up to 200 meters. Meanwhile, the salinity data was measured directly from 60 samples from community wells. The ERT and VES analysis results show that the coastal aquifer in Lampung Bay is at a depth of 2–24 m. SPT analysis identified interbedded sand, silt, and clay which were interpreted as marine sedimentation from the Holo-Quaternary Formation layer. Groundwater is only in shallow aquifers (less than 24 m) but has experienced seawater intrusion with low resistivity values between 9–20 ohm m. The distribution of high salinity values up to 3,100 ppm has reached more than 1 km from the coastline. Furthermore, ERT results reinforce this finding, which shows low resistivity values of less than 10 ohm m in the shallow aquifer zone. VES data detects low resistivity values (18 ohm m) at a depth of 12–13 m.
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Applied Environmental Research
Applied Environmental Research Environmental Science-Environmental Science (all)
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