Efficiency of a Marine Towed Electrical Resistivity Method

Chiang, Cheng-Yen; Goto, T.; Chen, Chien Chih; Hsu, Shu Kun

doi:10.3319/tao.2011.02.16.01(t)

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Marine electromagnetic methods have gradually gained the attention of Taiwanese scientists following these MCSEM experiments (Chiang et al, 2012;Chiang et al, 2011b).…”

Section: Marine Electromagnetic Exploration Is a Geophysical Prospectmentioning

confidence: 99%

Evaluations of an ocean bottom electro-magnetometer and preliminary results offshore NE Taiwan

Lin¹,

Chiang²,

Huang³

et al. 2019

Preprint

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Abstract. The first stage of field experiments involving the design and construction of a low-power consumption ocean bottom electro-magnetometer (OBEM) has been completed. To improve the performance of the OBEM, we rigorously evaluated each of its units, e.g., the data loggers, acoustic parts, internal wirings, and magnetic and electric sensors, to eliminate unwanted events such as unrecovered or incomplete data. The evaluations of the procedure included the following. Data logger: digitizer sensitivity, linearity, and errors Acoustic transceiver: “ENABLE,” “DISABLE,” “RANGE,” “RELEASE1,” “RELEASE2,” and “OPTION1” functions Magnetic sensor: sensitivity of the fluxgate and orthogonality Electrical receiver: potential voltage, impedance, and frequency responses Power consumption: the maximum operating current of two sets of batteries Deployment and recovery procedures on deck We confirmed the optimal performance of the OBEM after repeatedly testing the procedures. The first offshore deployment of the OBEM together with ocean bottom seismographs (OBSs) was performed in NE Taiwan, where the water depth is approximately 1,400 m. The total intensity of the magnetic field (TMF) measured by the OBEM varied in the range of 44,100–44,150 nT, which corresponded to the proton magnetometer measurements. The daily variations of the magnetic field were recorded using the two horizontal components of the OBEM magnetic sensor. We found that the inclinations and magnetic data of the OBEM varied with two observed earthquakes when compared to the OBS data. The potential fields of the OBEM were slightly, but not obviously, affected by the earthquakes.

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“…Marine electromagnetic methods have gradually gained the attention of Taiwanese scientists following these MCSEM experiments (Chiang et al, 2012;Chiang et al, 2011b).…”

Section: Marine Electromagnetic Exploration Is a Geophysical Prospectmentioning

confidence: 99%

Evaluations of an ocean bottom electro-magnetometer and preliminary results offshore NE Taiwan

Lin¹,

Chiang²,

Huang³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Bradbury and Taylor (1984), Sambuelli et al (2011Sambuelli et al ( , 2017, or Colombero et al (2014). The efficiency of the marine resistivity measurements using this towing method was investigated by Chiang et al (2011), as well as its sensitivity using two-dimensional (2D) numerical modelling (Chiang et al, 2012). Whole measurement grid is then moved along the survey line, as described in Putiška et al (2015).…”

Section: Introductionmentioning

confidence: 99%

Landslide‐dammed lake sediment volume calculation using waterborne ERT and SONAR profiling

Hartvich

Tábořík

Šobr

et al. 2020

Earth Surf Processes Landf

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Lake sediment volume calculation is a challenging task, namely in cases when detailed drilling is complicated, expensive, or impossible, information on the pre-sedimentation surface unavailable, and record of siltation rate non-existent or too short. This study shows how waterborne, non-invasive geophysical survey, such as electrical resistivity tomography (ERT) can be very effective in acquiring the missing data, namely when combined with sound navigation ranging (SONAR) water depth measurements and supported by information from auxiliary sources. However, ERT surveying in water environment requires specific approaches, as we illustrate on the case of the Mladotice lake study. The lake was created after a landslide in May 1872, and since its formation, the depth has gradually decreased due to sedimentation. We have reconstructed the original surface, calculated the sediment volume, and compiled information on sedimentation to estimate its remaining life span. To achieve this, we measured nine waterborne ERT profiles across the lake. To reach the necessary depth, all ERT profiles were extended on land and crossed the lake using custom-built flotation pads. ERT profiling was combined with SONAR depth measurements, historical bathymetric surveys, borehole core analysis, sediment flux measurements, volumetric calculations, and water conductivity probing. The study has achieved three main results. First, practical applicability and advantages of stationary waterborne ERT profiling in combination with bathymetric sounding were demonstrated. Second, the original lake volume and accumulated sediment was calculated. We estimate that the volume of lake sediment is 187000 m 3 , two-thirds of the original lake volume (over 275000 m 3). Finally, based on three volumetric data sets from 1972, 2003, and 2017, and recent monitoring of the sediment inflow, we propose scenarios of lake filling and its future development. Most interestingly, the sedimentation rate has decreased significantly in the last 20years, suggesting that the lake may survive much longer than hitherto expected.

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“…Baumgartner and Christensen [5] describe a particular array where probes are vertically aligned to increase the investigation depth for mapping resistivity anomalies located at greater water depth. Chiang et al [6,7] studied the efficiency of a marine towed electrical resistivity method and its sensitivity using 2D numerical simulation modelling as a well-suited method for methane hydrate exploration at a shallow depth beneath the seafloor.…”

Section: Introductionmentioning

confidence: 99%

3D Mapping of the Submerged Crowie Barge Using Electrical Resistivity Tomography

Simyrdanis

Moffat

Papadopoulos

et al. 2018

International Journal of Geophysics

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This study explores the applicability and effectiveness of electrical resistivity tomography (ERT) as a tool for the high-resolution mapping of submerged and buried shipwrecks in 3D. This approach was trialled through modelling and field studies of Crowie, a paddle steamer barge which sunk at anchor in the Murray River at Morgan, South Australia, in the late 1950s. The mainly metallic structure of the ship is easily recognisable in the ERT data and was mapped in 3D both subaqueously and beneath the sediment-water interface. The innovative and successful use of ERT in this case study demonstrates that 3D ERT can be used for the detailed mapping of submerged cultural material. It will be particularly useful where other geophysical and diver based mapping techniques may be inappropriate due to shallow water depths, poor visibility, or other constraints.

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Efficiency of a Marine Towed Electrical Resistivity Method

Cited by 6 publications

References 5 publications

Evaluations of an ocean bottom electro-magnetometer and preliminary results offshore NE Taiwan

Evaluations of an ocean bottom electro-magnetometer and preliminary results offshore NE Taiwan

Landslide‐dammed lake sediment volume calculation using waterborne ERT and SONAR profiling

3D Mapping of the Submerged Crowie Barge Using Electrical Resistivity Tomography

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