Excess pore water pressure and seepage in slopes induced by breaking internal solitary waves

Tian, Zhuangcai; Jia, Lei; Xiang, Jiaming; Yuan, Guotao; Yang, Kun; Wei, Jun; Zhang, Mingwei; Shen, Huijuan; Yue, Jianhua

doi:10.1016/j.oceaneng.2022.113281

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…The sedimentation rate of sediment is calculated using the formula proposed by Soulsby (1997): (Tian et al, 2021(Tian et al, , 2023. According to the ratio of water depth to wavelength, waves are divided into deep water waves (the ratio of water depth and wavelength h/L > 0.5), shallow water waves (h/L < 0.05), and finite water waves (0.05 ≤ h/L ≤ 0.5).…”

Section: Sediment Transport Modelmentioning

confidence: 99%

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Yu,

Hu,

Zhang

et al. 2024

Deep Underground Science and Engineering

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Due to their high reliability and cost‐efficiency, submarine pipelines are widely used in offshore oil and gas resource engineering. Due to the interaction of waves, currents, seabed, and pipeline structures, the soil around submarine pipelines is prone to local scour, severely affecting their operational safety. With the Yellow River Delta as the research area and based on the renormalized group (RNG) k‐ε turbulence model and Stokes fifth‐order wave theory, this study solves the Navier–Stokes (N–S) equation using the finite difference method. The volume of fluid (VOF) method is used to describe the fluid‐free surface, and a three‐dimensional numerical model of currents and waves–submarine pipeline–silty sandy seabed is established. The rationality of the numerical model is verified using a self‐built waveflow flume. On this basis, in this study, the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed in the prototype environment are explored and the influence of the presence of pipelines on hydrodynamic features such as surrounding flow field, shear stress, and turbulence intensity is analyzed. The results indicate that (1) local scour around submarine pipelines can be divided into three stages: rapid scour, slow scour, and stable scour. The maximum scour depth occurs directly below the pipeline, and the shape of the scour pits is asymmetric. (2) As the water depth decreases and the pipeline suspension height increases, the scour becomes more intense. (3) When currents go through a pipeline, a clear stagnation point is formed in front of the pipeline, and the flow velocity is positively correlated with the depth of scour. This study can provide a valuable reference for the protection of submarine pipelines in this area.

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Section: Sediment Transport Modelmentioning

confidence: 99%

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Yu,

Hu,

Zhang

et al. 2024

Deep Underground Science and Engineering

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“…Meanwhile, these studies indicate that ISW can induce seabed instability, especially during the process of shallow and broken ISW, which have a stronger impact on the seabed. Tian, Jia, Xiang et al (2023) simulated the breaking of ISW by large Eddy simulation (LES) and analyzed the pressure induced by ISW. They found that ISW-induced pressure changed the polarity when it propagated over the slope, and the two different parts of the seabed faced different failure risks (Tian, Jia, Xiang, et al, 2023).…”

Section: Deep Underground Science and Engineeringmentioning

confidence: 99%

Interaction between internal solitary waves and the seafloor in the deep sea

Tian,

Huang,

Xiang

et al. 2024

Deep Underground Science and Engineering

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Internal solitary wave (ISW), as a typical marine dynamic process in the deep sea, widely exists in oceans and marginal seas worldwide. The interaction between ISW and the seafloor mainly occurs in the bottom boundary layer. For the seabed boundary layer of the deep sea, ISW is the most important dynamic process. This study analyzed the current status, hotspots, and frontiers of research on the interaction between ISW and the seafloor by CiteSpace. Focusing on the action of ISW on the seabed, such as transformation and reaction, a large amount of research work and results were systematically analyzed and summarized. On this basis, this study analyzed the wave–wave interaction and interaction between ISW and the bedform or slope of the seabed, which provided a new perspective for an in‐depth understanding of the interaction between ISW and the seafloor. Finally, the latest research results of the bottom boundary layer and marine engineering stability by ISW were introduced, and the unresolved problems in the current research work were summarized. This study provides a valuable reference for further research on the hazards of ISW to marine engineering geology.

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“…It may be that, in the four hours during which the current changed, from 8:00 to 12:00 on 9 August, the upward propagation of the water mass was 10 cm above 0.2 m from the seabed, but the current direction at the height of 0.2 m is similar to that at the height of 0.1 m. This could be due to the terrain causing the destruction of water masses. The interaction of these water masses with the terrain can cause the flat seabed to become resuspended [46][47][48]. The average current velocity in the horizontal direction is 7 cm/s in its normal sea conditions (from 11:00 on 8 August to 8:00 on 9 August) (Figure 3).…”

Section: The Change Process Of the Current's Direction Near The Botto...mentioning

confidence: 99%

Impact of the Mining Process on the Near-Seabed Environment of a Polymetallic Nodule Area: A Field Simulation Experiment in a Western Pacific Area

Li,

Jia,

Fan

et al. 2023

Sensors

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With the consumption of terrestrial metal resources, deep-sea polymetallic nodule minerals have been widely exploited around the world. Therefore, the environmental impact of deep-sea polymetallic nodule mining cannot be ignored. In this study, for the first time, a field disturbance and observation device, integrated with multiple sensors, is used to simulate the disturbance process of mining on seabed sediments in the polymetallic nodule area of the western Pacific Ocean at a depth of 5700 m. The impact of the process of stroking and lifting on the bottom sediment in the polymetallic nodule area is 30 times higher than that caused by the waves or the current. The time for turbidity to return to normal after the increase is about 30 min, and the influence distance of a disturbance to the bottom bed on turbidity is about 126 m. The time it takes for density to return to normal is about four hours, and the influence is about 1000 m. At the same time, the resuspension of the bottom sediment leads to an increase in density anomaly and salinity. Moreover, suspended sediments rich in metal ions may react with dissolved oxygen in water, resulting in a decrease in the dissolved oxygen content and an increase in ORP. During the observation period, the phenomenon of a deep-sea reciprocating current is found, which may cause the suspended sediment generated by the continuous operation of the mining vehicle to produce suspended sediment clouds in the water near the bottom of the mining area. This could lead to the continuous increase in nutrients in the water near the bottom of the mining area and the continuous reduction in dissolved oxygen, which will have a significant impact on the local ecological environment. Therefore, the way mining vehicles dig and wash in water bodies could have a marked impact on the marine environment. We suggest adopting the technology of suction and ore separation on mining ships, as well as bringing the separated sediment back to the land for comprehensive utilization.

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Excess pore water pressure and seepage in slopes induced by breaking internal solitary waves

Cited by 15 publications

References 29 publications

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Interaction between internal solitary waves and the seafloor in the deep sea

Impact of the Mining Process on the Near-Seabed Environment of a Polymetallic Nodule Area: A Field Simulation Experiment in a Western Pacific Area

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