Characteristics of Portable Core Samplers for Lake Deposit Investigations

Katsuki, Kota; Seto, Kazuto; Suganuma, Yûsuke; Yang, Dong-Yoon

doi:10.5026/jgeography.128.359

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The physical parameters are presented in Table 2. In the analysis, the range of inner diameters of pipes was set from 0.030 to 0.070 because pipes with inner diameter of 0.020–0.075 m are typically used for sampling (Kota et al, 2019; Mudroch & Azcue, 1995). Furthermore, the outer radius

{R}_{{\rm{p}}}

is set from 0.016 to 0.036 m (we assume the pipe thickness as 0.001 m).…”

Section: Numerical Analysis For Sediment Penetrationmentioning

confidence: 99%

“…Several sampling devices such as dredges, grab samplers, gravity samplers, and piston corers are used for sediment sampling depending on purposes (Kota et al, 2019; Mudroch & Azcue, 1995). Many of those samplers are weighted because they use their gravitational force and inertial force for sediment penetration.…”

Section: Introductionmentioning

confidence: 99%

“…Several sampling devices such as dredges, grab samplers, gravity samplers, and piston corers are used for sediment sampling depending on purposes (Kota et al, 2019;Mudroch & Azcue, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Sediment penetration performance of a portable underwater robot for core sampling

Sakagami

Kawabata

Yokoi

et al. 2023

Journal of Field Robotics

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As described in this paper, we investigate the sediment penetration performance of a portable underwater robot with a helical screw pipe using marine thrusters with limited force. First, we derive a mathematical model based on an empirical and simple method using the undrained shear strength of cohesive soil to provide a rough estimate of maximum penetration depths. Then, we perform numerical analysis for estimating the maximum depth of sediment penetration and for designing a sampling pipe. Additionally, we use experimentation to investigate the relation between the penetration depth of the helical screw pipe and the force of marine thrusters mounted on the portable underwater robot. After testing the penetration performance in a water tank, we conduct a field experiment at Lake Biwa and obtain results of the penetration depths. The maximum penetration into the lake sediment is at least 0.30 m. The results demonstrated the possibility of using the derived mathematical model to make a rough estimation of the maximum penetration depth for clay sediments. Additionally, we can use non‐powerful thrusters equipped with small autonomous underwater vehicles (AUVs) and remotely operated vehicles (ROVs) for sediment sampling. The proposed method is also applicable for the installation of underwater sensors using small AUVs and ROVs.

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{R}_{{\rm{p}}}

is set from 0.016 to 0.036 m (we assume the pipe thickness as 0.001 m).…”

Section: Numerical Analysis For Sediment Penetrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sediment penetration performance of a portable underwater robot for core sampling

Sakagami

Kawabata

Yokoi

et al. 2023

Journal of Field Robotics

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“…The water temperature and EC25 from the loggers were calibrated by those from the profiler with relatively high accuracies. Lake water and bottom sediment at site MD were sampled on boat by a Van Dorn sampler (URL https://www.kc-denmark.dk/products/water-sampler/van-dorn-watersampler.aspx (accessed on 6 September 2021)) and an Ekman-Burge grab sampler [19], respectively. The water temperature, EC25 and pH of the lake water were then measured by a thermocouple thermometer (Type TX1001, YOKOGAWA, Co. Ltd., Tokyo, Japan), a compact EC meter (Type LAQUAtwin EC-11, HORIBA, Co. Ltd., Kyoto, Japan) and a compact pH meter (Type LAQUAtwin pH-11B, HORIBA, Co. Ltd., Kyoto, Japan; URL https://www.horiba.com/en_en/water-quality/pocket-meters/ (accessed on 18 November 2021)).…”

Section: Field Observationsmentioning

confidence: 99%

Hydrological and Chemical Budgets of Okama Crater Lake in Active Zao Volcano, Japan

et al. 2022

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The Okama Crater Lake is located in the highly active Zao Volcano on the boundary of Miyagi and Yamagata Prefectures, Japan. At present, the lake stays relatively calm with neither bubbling, steaming nor gas smell at a pH of 3.2–3.4, though the lake did change color with steaming from the water surface in 1939 as the result of one of Zao’s volcanic activities. In order to clarify the geothermal effect on Okama and the groundwater flow system below or around Okama, field observations were performed in 2019 and 2020. Groundwater inflow and outflow in Okama were separately evaluated by estimating the hydrological and chemical budgets of the lake, based on the hydrometeorology, water temperature and river inflow measured in the field. The average groundwater inflow and outflow were estimated at 0.012 m3/s and 0.039 m3/s during the non-rainfall periods of 2020, respectively. A surplus of groundwater outflow makes the lake level consistently decrease during non-rainfall periods or the completely ice-covered season. In the completely ice-covered periods, the water temperature consistently increased at 0–15 m above the lake bottom, which is probably due to thermal leakage from a hydrothermal reservoir below the lake bottom. The heat fluxes averaged over December 2019–April 2020 and December 2020–March 2021 were calculated at 2.5 and 2.9 W/m2, respectively. A coupling between the estimated groundwater inflow and the calculated geothermal heat flux was used to evaluate the temperature of inflowing groundwater.

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“…While lowering the profiler below water surface by rope (descending speed of 0.5 m/s or less), water temperature, electric conductivity and water turbidity were automatically recorded in the profiler itself, with the pressure sensor responding to the water pressure increasing at the 0.1 m depth interval. Meanwhile, surface water and bottom sediment were sampled by a 2 L Van-Dorn water sampler (URL: https://www.kc-denmark.dk/products/water-sampl er/van-dorn-water-sampler.aspx (accessed on 6 September 2021)) and an Ekman-Burge grab sampler [34], respectively. The undisturbed sediment ca.…”

Section: Field Observationsmentioning

confidence: 99%

Behaviors of the Yukon River Sediment Plume in the Bering Sea: Relations to Glacier-Melt Discharge and Sediment Load

Chikita

Wada²,

Kudo

et al. 2021

Water

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Sediment plumes, released to the Bering Sea from the delta front of the Yukon River, Alaska, are initiated mainly by glacier-melt sediment runoffs in the glacierized regions of the Yukon River drainage basin. The surface sediment plumes are extended around the fan-shaped Yukon River delta, which is followed by the northwestward dispersion. During continuous measurements of the Yukon River discharge and sediment load, behaviors of the sediment plumes were explored by shipboard and coastal observations in the Bering Sea. At the high river sediment load of ca. 2500 kg/s, the plume partially plunged into the sea bottom layer. The plunging probably originated in the nepheloid-layer formation from the flocculation of river-suspended sediment, of which more than 90% wt. is silt and clay (grain size d < 63 μm). In order to numerically obtain the area of the surface sediment plumes, a satellite image analysis was performed by using three near-infrared bands in MODIS/Aqua or MODIS/Terra. The plume area was significantly correlated (R2 = 0.735, p < 0.01) to the sediment load averaged for the two days with time lags of 20 days and 21 days to the date of a certain satellite image. Hence, the dispersion of plume-suspended sediment appears to be controlled by the sediment runoff events in the Yukon River rather than the northward “Alaskan Coastal Water”.

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Characteristics of Portable Core Samplers for Lake Deposit Investigations

Cited by 5 publications

References 16 publications

Sediment penetration performance of a portable underwater robot for core sampling

Sediment penetration performance of a portable underwater robot for core sampling

Hydrological and Chemical Budgets of Okama Crater Lake in Active Zao Volcano, Japan

Behaviors of the Yukon River Sediment Plume in the Bering Sea: Relations to Glacier-Melt Discharge and Sediment Load

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