Detection, imaging and analysis of lava tubes for planetary analogue studies using electric methods (ERT)

Torrese, Patrizio; Pozzobon, Riccardo; Rossi, A. P.; Unnithan, Vikram; Sauro, Francesco; Borrmann, Dorit; Lauterbach, Helge; Santagata, Tommaso

doi:10.1016/j.icarus.2020.114244

Cited by 17 publications

(12 citation statements)

References 37 publications

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“…This is confirmed by recent Electrical Resistivity Tomography (ERT) surveys orthogonal to the tube in Torrese et al., 2021. The identified series of elliptically‐shaped channels have a width ranging from 7 to 13 m with a ceiling depth from the surface of 14–29 m. Most of them appear to be presently isolated from the main tube and were partially undrained and therefore short‐lived features.…”

Section: Discussionsupporting

confidence: 66%

“…The general process would be similar to that described by Kauahikaua et al (1998) in Hawaii, where the lava advanced as a complex, anastomosing system of small tubes. This is confirmed by recent Electrical Resistivity Tomography (ERT) surveys orthogonal to the tube in Torrese et al, 2021. The identified series of elliptically-shaped channels have a width ranging from 7 to 13 m with a ceiling depth from the surface of 14-29 m. Most of them appear to be presently isolated from the main tube and were partially undrained and therefore short-lived features.…”

Section: Lava Tube Genetic Mechanism and Morphologiessupporting

confidence: 70%

“…With regard to the early stages of its development, our data suggest that the lava tube emplacement happened after the pyroclastic deposit and during the effusive stage of the La Corona event. In particular from field and geophysical data (Torrese et al., 2021), it is evident that the tube was excavated underneath 10–20 m of lava flows and was well‐developed within ∼900 m from the main vent. Since the pyroclastic horizon is visible at 15 m of depth at Jameo de los Prendes (∼1 km down from the first Jameo de los Molinos, Figures 3b and 6a, and Section 1.03 in Plate 1, Supporting Information S1) and in view of its regional position and dip (Figure 7), it is very likely that the same layer is at a similar depth upslope, although in that case overlying the Famara massive.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Inception and Evolution of La Corona Lava Tube System (Lanzarote, Canary Islands, Spain)

et al. 2022

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Section: Discussionsupporting

confidence: 66%

Section: Lava Tube Genetic Mechanism and Morphologiessupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

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Inception and Evolution of La Corona Lava Tube System (Lanzarote, Canary Islands, Spain)

et al. 2022

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“…ERT's advantages include a non-hazardous application, low implementation costs, high measurement speed, portability, and straightforward implementation [20]. As a result, ERT has broad industrial applications in geophysical explorations [21], crystallization processes [22], materials investigations [23], and multiphase flows [24]. In the literature, one can come across studies that used current-voltage (CV-ERT) or voltage-current (VC-ERT) ERT instruments.…”

Section: Introductionmentioning

confidence: 99%

A Fast Electrical Resistivity-Based Algorithm to Measure and Visualize Two-Phase Swirling Flows

Sattar

Garcia

Portela

et al. 2022

Sensors

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Electrical resistance tomography (ERT) has been used in the literature to monitor the gas–liquid separation. However, the image reconstruction algorithms used in the studies take a considerable amount of time to generate the tomograms, which is far above the time scales of the flow inside the inline separator and, as a consequence, the technique is not fast enough to capture all the relevant dynamics of the process, vital for control applications. This article proposes a new strategy based on the physics behind the measurement and simple logics to monitor the separation with a high temporal resolution by minimizing both the amount of data and the calculations required to reconstruct one frame of the flow. To demonstrate its potential, the electronics of an ERT system are used together with a high-speed camera to measure the flow inside an inline swirl separator. For the 16-electrode system used in this study, only 12 measurements are required to reconstruct the whole flow distribution with the proposed algorithm, 10× less than the minimum number of measurements of ERT (120). In terms of computational effort, the technique was shown to be 1000× faster than solving the inverse problem non-iteratively via the Gauss–Newton approach, one of the computationally cheapest techniques available. Therefore, this novel algorithm has the potential to achieve measurement speeds in the order of 104 times the ERT speed in the context of inline swirl separation, pointing to flow measurements at around 10kHz while keeping the average estimation error below 6 mm in the worst-case scenario.

show abstract

“…ERT's advantages include a non-hazardous application, low implementation costs, high measurement speed, portability and straightforward implementation [20]. As a result, ERT has broad industrial applications in geophysical explorations [21], crystallization processes [22], materials investigations [23], and multiphase flows [24]. In the literature, one can come across studies that used currentvoltage (CV-ERT) or voltage-current (VC-ERT) ERT instruments.…”

Section: Introductionmentioning

confidence: 99%

A Fast Electrical Resistivity-Based Algorithm to Measure and Visualize Two-Phase Swirling Flows

Sattar¹,

Garcia²,

Portela³

et al. 2021

Preprint

View full text Add to dashboard Cite

Electrical Resistance Tomography (ERT) has been used in the literature to monitor the gas-liquid separation. However, the image reconstruction algorithms used in the studies take a considerable amount of time to generate the tomograms, which is far above the time scales of the flow inside the inline separator and, as a consequence, the technique is not fast enough to capture all the rele-vant dynamics of the process, vital for control applications. This article proposes a new strategy based on the physics behind the measurement and simple logics to monitor the separation with a high temporal resolution by minimizing both the amount of data and the calculations required to reconstruct one frame of the flow. To demonstrate its potential, the electronics of an ERT system are used together with a high-speed camera to measure the flow inside an inline swirl separator. For the 16-electrode system used in this study, only 12 measurements are required to reconstruct the whole flow distribution with the proposed algorithm, 10x less than the minimum number of measurements of ERT (120). In terms of computational effort, the technique was shown to be 1000x faster than solving the inverse problem non-iteratively via the Gauss-Newton approach, one of the computationally cheapest techniques available. Therefore, this novel algorithm has the potential to achieve measurement speeds in the order of 104 times the ERT speed in the context of inline swirl separation, pointing to flow measurements at around 10kHz while keeping the aver-age estimation error below 6 mm in the worst case scenario.

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Detection, imaging and analysis of lava tubes for planetary analogue studies using electric methods (ERT)

Cited by 17 publications

References 37 publications

Inception and Evolution of La Corona Lava Tube System (Lanzarote, Canary Islands, Spain)

Inception and Evolution of La Corona Lava Tube System (Lanzarote, Canary Islands, Spain)

A Fast Electrical Resistivity-Based Algorithm to Measure and Visualize Two-Phase Swirling Flows

A Fast Electrical Resistivity-Based Algorithm to Measure and Visualize Two-Phase Swirling Flows

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