Review and Analysis of Key Techniques in Marine Sediment Sampling

He, Shudong; Peng, Youduo; Jin, Yongping; Wan, Buyan; Liu, Guangping

doi:10.1186/s10033-020-00480-0

Cited by 31 publications

(13 citation statements)

References 48 publications

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“…30.60MPa to 28.34MPa (system-1, decreased by 7.4%) and 30.60MPa to 28.18MPa (system-2, decreased by 7.9%), respectively, which shows that the transfer device has sufficient strength and sealing performance compared with other pressure-retaining devices (Abid et al, 2015;Peoples et al, 2019;He et al, 2020). Since the volume of the system-2 chamber is greater than the volume of the system-1 chamber, the pressure drops in system-2 is greater.…”

Section: Pressure-retaining Performance Testmentioning

confidence: 90%

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Guo

Zhou²,

Ge³

et al. 2022

Front. Mar. Sci.

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Methane leakage at the interface between sediment and overlying seawater is an important basis for gas hydrate exploration. Therefore, a transfer device with working pressure of 30MPa and corresponding scheme are proposed to separate and transfer the sediment and overlying water inside the sampler under the condition of pressure-retaining. Based on the pressure relief valve with adjustable threshold pressure, the device transfers the overlying water by compressing the internal volume and transfers the sediment by secondary sampling. The performance of transfer device is studied by simulation and experiment. Based on the coupled Eulerian-Lagrangian approach in the Abaqus, the secondary sampling was investigated, and the penetration resistance and coring rate of the secondary sampling tube are 141N and 86.2%, respectively. By using the hydraulic simulation software AMESim, the pressure fluctuation caused by the movement of the mechanism during the transfer process was studied, and the pressure fluctuation amplitude is within 0.89 MPa. Furthermore, the laboratory transfer tests were carried out under high pressure conditions, and meantime, the simulation results are verified. Under the working condition of 30MPa, the device can maintain a pressure loss of no more than 8.0% (2.4MPa) within two hours, maintain pressure fluctuations during the transfer process within 4.8% (1.44MPa), and ensure that the pressure in the culture kettle decreases by 4.7% relative to the pressure in the sampler after the transfer, which shows the feasibility of the device application.

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Section: Pressure-retaining Performance Testmentioning

confidence: 90%

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Guo

Zhou²,

Ge³

et al. 2022

Front. Mar. Sci.

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“…Further, when drilling in sediment formations, the drilling fluid readily causes severe erosion on the hole wall and core. It is necessary to reasonably control the drilling fluid core surface velocity and return velocity as the bit water passage system is operated [11,12] . Core drilling uses conventional type or bottom jetting type diamond bits depending on the differences in water passage systems, as shown in Figure 2 [13][14] .…”

Section: Fig 1 Two Methods Of Seafloor Samplingmentioning

confidence: 99%

Design and Application of Diamond Bit Water Passage System, Seafloor Drill Parameters

Wang

Qian

Sun

et al. 2021

Preprint

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The operation and formation characteristics of a seafloor drill are utilized to design a water passage system for bottom-jetting diamond bits based on the multi-objective optimization theory. Fluid dynamics theory and the effects of bit rotation on the flow field at the hole bottom are used to analyze the impact of structural and drilling parameters of the HQ-size bit on the flow field of the waterway system. Considering the effect of the grinding length ratio of the bit on the lopsided wear of the inner and outer diameters, the water passage system parameter design and maximum projection area of the cutting tooth are effective optimization goals to improve the normal service life of the bit. The flow field of the drilling fluid at the hole bottom becomes more turbulent and the efficiency of carrying cuttings return decreases as the waterway height of the bit increases. The optimal bit rotation speed is 250–400 rpm. When drilling into conventional formations, the pump displacement should be controlled within the range of 50–80 L/min. When drilling into sediment formations, the pump displacement should be controlled within the range of 50–65 L/min. An on-site drilling test verified the rationality of the bit water passage system design and corresponding drilling parameters.

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“…On the other hand, it is reported that samples from the water column do not provide a good characterization of the underlying benthic taxa suggesting that benthic biodiversity surveys should be also performed (Antich et al, 2021b;Brandt et al, 2021). Seabed sediment acquisition technologies are continuously improved and optimized, so as to obtain more authentic and reliable samples to meet the everincreasing demands on sampling capabilities (He et al, 2020) and adaptation to cabled observatory infrastructures.…”

Section: Integrating Environmental Dna With Optoacoustic Imagingmentioning

confidence: 99%

Framing Cutting-Edge Integrative Deep-Sea Biodiversity Monitoring via Environmental DNA and Optoacoustic Augmented Infrastructures

et al. 2022

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Deep-sea ecosystems are reservoirs of biodiversity that are largely unexplored, but their exploration and biodiscovery are becoming a reality thanks to biotechnological advances (e.g., omics technologies) and their integration in an expanding network of marine infrastructures for the exploration of the seas, such as cabled observatories. While still in its infancy, the application of environmental DNA (eDNA) metabarcoding approaches is revolutionizing marine biodiversity monitoring capability. Indeed, the analysis of eDNA in conjunction with the collection of multidisciplinary optoacoustic and environmental data, can provide a more comprehensive monitoring of deep-sea biodiversity. Here, we describe the potential for acquiring eDNA as a core component for the expanding ecological monitoring capabilities through cabled observatories and their docked Internet Operated Vehicles (IOVs), such as crawlers. Furthermore, we provide a critical overview of four areas of development: (i) Integrating eDNA with optoacoustic imaging; (ii) Development of eDNA repositories and cross-linking with other biodiversity databases; (iii) Artificial Intelligence for eDNA analyses and integration with imaging data; and (iv) Benefits of eDNA augmented observatories for the conservation and sustainable management of deep-sea biodiversity. Finally, we discuss the technical limitations and recommendations for future eDNA monitoring of the deep-sea. It is hoped that this review will frame the future direction of an exciting journey of biodiscovery in remote and yet vulnerable areas of our planet, with the overall aim to understand deep-sea biodiversity and hence manage and protect vital marine resources.

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Review and Analysis of Key Techniques in Marine Sediment Sampling

Cited by 31 publications

References 48 publications

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Development of a pressure-retaining separation and transfer system for sediment and overlying seawater

Design and Application of Diamond Bit Water Passage System, Seafloor Drill Parameters

Framing Cutting-Edge Integrative Deep-Sea Biodiversity Monitoring via Environmental DNA and Optoacoustic Augmented Infrastructures

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