Application of vlf method to identify flow patterns of underground river in the karst area Ngargoharjo, Wonogiri

Nugraha, Edu Dwiadi; Susanto, Hadi; Khumaedi,

doi:10.1088/1742-6596/1170/1/012071

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…The Very Low Frequency (VLF) method is also widely used to detect subsurface caves in both empty (air-filled) 9,10 and also water-filled cave. [11][12][13] This study intends to determine the possibility of subsurface rivers in the karst area in Tanjungsari District geological-strutre analysis and VLF methods. The results of this study are expected to provide information about the position of the subsurface river, making it easier for the government to take water well through drilling.…”

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confidence: 99%

Application of Very Low Frequency (VLF) Method for Estimating Karst Underground River in Tanjungsari District

Zakaria

Kusumayudha

Pratistho

et al. 2021

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Drought is the main problem for clean water needs in Tanjungsari district. This research aims to provide information on the existence of underground river for deep well drilling. The methods used are geologic-structural analysis and application of Very Low Frequency (VLF) methods. Strike and dip measurements of 150 joints were conducted in the research area. Analysis using rosette diagram shows that the main geologic-structure orientation has a direction of Northwest - Southeast and Northeast – Southwest. Very Low Frequency (VLF) acquisition was measured across the possible occurrence of subsurface water flow directions predicted from geologic-structural analysis. The length of the VLF acquisition line is 2500 meters with 30 m spacing and 108 points acquisitions. The direction of VLF line is N 2700 E. The result shows that there are 2 locations that have high conductivity values, appearing at 1800 meters and 2200 meters. The results of this structural and VLF analyses indicate the existence of underground river at the location of 454326 N, 9105870 E.

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confidence: 99%

Application of Very Low Frequency (VLF) Method for Estimating Karst Underground River in Tanjungsari District

Zakaria

Kusumayudha

Pratistho

et al. 2021

cset

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“…These secondary waves are produced from the induction of primary electromagnetic waves emitted from radio transmitters with very low frequencies, namely 10-30 KHz [3]. This method is commonly used in underground river exploration by exploiting the conductive properties of water and can cover steep terrain and broad regional conditions in karst areas [4]. The previous researchers (Iswahyudi et al, 2023) used the VLF-EM method to search for groundwater river patterns in karst areas.…”

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confidence: 99%

Mapping Underground River Flows in karst Areas with the VLF-EM Method (Case Study of the Krawak Region, Singgahan Tuban)

Purwanto,

Susilo,

Bahri

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The Krawak Springs is a source of springs from the cracks of river rocks in the middle of a teak forest in Guwoterus Village, Montong District, Tuban. This spring is a source of irrigation water for agricultural land in the District of Montong. Based on its urgency, it is necessary maintaining its sustainability by identifying recharge areas and underground river flows. VLF is quite advantageous for use in the regional mapping underground rivers in karst areas because can describe the structure of the karst environment and predict interconnected pathways in karst. Data acquisition uses four tracks with an average length of about 300 m. Data processing was made qualitatively using MATLAB software and quantitatively using Inv2DVLF software. Qualitative results show that the conductive zone is identified as a subsurface river flow. From the processing results, it is known that the subsurface river flow zone can be identified as a zone that is conductive or has low resistivity. The underground river flow is interpreted to be located on Track 3 and Track 4 and has a direction of continuity to the southwest

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Application of vlf method to identify flow patterns of underground river in the karst area Ngargoharjo, Wonogiri

Cited by 2 publications

References 2 publications

Application of Very Low Frequency (VLF) Method for Estimating Karst Underground River in Tanjungsari District

Application of Very Low Frequency (VLF) Method for Estimating Karst Underground River in Tanjungsari District

Mapping Underground River Flows in karst Areas with the VLF-EM Method (Case Study of the Krawak Region, Singgahan Tuban)

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