The Role of Waves in Causing Submarine Landslides

Henkel, D. J.

doi:10.1680/geot.1970.20.1.75

Cited by 193 publications

(70 citation statements)

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“…The oceanic wave passage produces pressure changes in water between the crest and trough. These pressure changes may mobilize soft unconsolidated delta sediments on the seafloor up to 100 m depth [23]. To evaluate the role of wall collapse on pit edge erosion, slope modification, and pit infilling, pressure differences along two bathymetric profiles were calculated using the model from Henkel [23].…”

Section: Discussionmentioning

confidence: 99%

“…The model computes bed shear stress using currents and waves, and critical shear stress from median grain size of sediments on sea bed, through which resuspended sediment concentration on sea bed was simulated. (2) Wave-induced sea bed failure model from Henkel [23], which estimates the pressure difference around the pit caused by waves, and evaluates its contribution to pit wall collapse. (3) Pit infilling model from Lu and Nairn [24], predicts pit infilling as well as evaluates margin erosion caused by currents.…”

Section: Analysis Methodsmentioning

confidence: 99%

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Forces Driving the Morphological Evolution of a Mud-Capped Dredge Pit, Northern Gulf of Mexico

Wang

et al. 2018

Water

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Sandy sediments preserved as paleo-channel fill on the inner shelf, some of which are overlain by modern muds, have been mined for barrier island restoration along the northern Gulf of Mexico. These mined areas have been termed "mud-capped" dredge pits. The processes governing the morphological evolution of the pits are poorly constrained due to limited observational data. Physical oceanographic (e.g., currents and waves) and sedimentary data were collected at Sandy Point dredge pit offshore Plaquemines Parish, Louisiana in summer 2015. Currents outside the pit flowed southward and/or southeastward at speeds of 8-20 cm/s, while currents inside the pit had speeds less than 2 cm/s with no clear dominant direction. Wave heights detected inside the pit were less than 0.4 m. A high turbidity layer with suspended sediment concentration around 4 g/L was observed above the pit floor, and its thickness was~0.5 m. With observational data as input, three 2-D numerical models were employed to predict pit morphological responses, including pit infilling, margin erosion and slope change. The model results suggest that resuspension events were rare on the seafloor adjacent to the pit under summer fair weather conditions. Modeled pit margin erosion was very limited. With little resuspension of seafloor sediment locally, weak margin erosion and stable pit walls, the dominant process governing pit evolution was infilling sourced by the deposition of suspended sediments from the Mississippi River plume.

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Section: Discussionmentioning

confidence: 99%

Section: Analysis Methodsmentioning

confidence: 99%

Forces Driving the Morphological Evolution of a Mud-Capped Dredge Pit, Northern Gulf of Mexico

Wang

et al. 2018

Water

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“…One is shear failure, and another is seabed liquefaction [5]. The shear failure of seabed caused by waves was first forwarded by [1]. Mitchell and Hull [6] followed Henkel's path and substantiated Henkel's findings.…”

Section: Literature Reviewmentioning

confidence: 97%

“…With the wide application of high strength material, the scour damage has already been efficiently reduced [1]. However, the existing methods do not fully reduce damage caused by wave-induced seabed instability.…”

Section: Introductionmentioning

confidence: 99%

Pore Pressure Response of Clayey Seabed Under Ocean Wave

Wang¹

2014

geomate

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ABSTRACT:In this study, a 2-D quasi-dynamic u-w-p model is developed to examine the wave-induced clayey seabed behavior. Further, this paper aims to provide a better understanding of the unstable condition of clayey seabed in the vicinity of coastal structure. In the proposed u-w-p model, acceleration, velocity, and displacement terms are considered different for both solid and fluid phases. The governing equations of u-wp model are determined from constitutive law and conservation law under certain assumptions. The numerical solutions are developed by using Finite Difference Method (FDM) and three outputs (pore water pressure, effective vertical stress and shear stress) are analyzed. The result shows that both liquefaction and shear failure have low potential to occur in clayey seabed, this is due to by the soil structure and low permeability of clay. The pore water pressure vary linearly according to the depth, however, this variation is not significant in clayey seabed. In addition, there is no phase lag in clayey seabed. This paper presents the findings on wave induced stress variation in seabed with fine-grained soil, which differs to some of the published literature on sandy seabed.

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“…This may suggest strong current action. The role of waves in causing submarine landslides was discussed by Henkel (1970).…”

Section: Concretionsmentioning

confidence: 99%