scholarly journals Ship-wave induced sediment transport in tidal creeks

2006 ◽  
Author(s):  
T. M. Ravens ◽  
R. Thomas
Keyword(s):  
Sediment Transport ◽  
Tidal Creeks ◽  
Ship Wave ◽  
Wave Induced

An Experimental Study on the Wave-Induced Topographic Change in Artificial Shallows: Focusing on the Effects of Pore-Water Pressure on Sediment Transport

2014 ◽  
Vol 56 (2) ◽  
pp. 1450008-1-1450008-21 ◽  
Author(s):  
Tomoaki Nakamura ◽  
Yuta Nezasa ◽  
Yong-Hwan Cho ◽  
Ryo Ishihara ◽  
Norimi Mizutani
Keyword(s):  
Experimental Study ◽  
Sediment Transport ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Wave Induced

NUMERICAL INVESTIGATION OF THE IRREGULAR WAVE-INDUCED SEDIMENT TRANSPORT PROCESSES

2019 ◽  
Author(s):  
ZHUBIN CAO ◽  
CHI ZHANG ◽  
HONGSHUAI QI ◽  
YAO ZHANG ◽  
JINHAI ZHENG ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Numerical Investigation ◽  
Transport Processes ◽  
Irregular Wave ◽  
Wave Induced

scholarly journals WAVE-INDUCED FLOW AND NEARSHORE SUSPENDED SEDIMENT

1988 ◽  
Vol 1 (21) ◽  
pp. 108 ◽  
Author(s):  
J.C. Doering ◽  
A.J. Bowen
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Sediment Concentration ◽  
Accurate Prediction ◽  
Wave Crest ◽  
Wave Trough ◽  
Induced Flow ◽  
Wave Induced ◽  
Velocity Skewness

It has been realized for nearly one hundred years that the transport of sediment is related to the characteristics of a wave, in particular its shape. Cornish (1898) noticed that the shoreward velocity associated with a wave crest was more effective at moving coarse sediment than was the seaward velocity associated with the wave trough. Cornish's observation was consistent with the theory of Stokes (1847), which predicts the onshore velocity associated with the wave crest is stronger and of shorter duration than the offshore velocity associated with the wave trough. This horizontal asymmetry of the cross-shore flow, which is a reflection of the wave shape, is known as velocity skewness. It has been suggested that "the existence of the beach depends on small departures from symmetry in the velocity field balancing the tendency for gravity to move material offshore"(Bowen, 1980). Although the concept of velocity skewness has been incorporated into detailed predictors of sediment transport (Bowen, 1980; Bailard and Inman, 1981) it is only one of many facets that needs to be understood in order to make the accurate prediction of sediment transport realizable. A comprehension of sediment transport is hampered by both an incomplete knowledge of the hydrodynamics and a lack of instrumentation to directly measure instantaneous sediment concentration and the accurate prediction of sediment transport is probably the most enigmatic problem in coastal engineering. Occasionally, suspended sediment concentration has been inferred from in situ pumps and hand-held tubes, but these methods lack the temporal and spatial resolution necessary to elucidate the details of the interaction between the waveinduced flow and the sediment. Recently, a miniature optical backscatter sensor (MOBS), which provides a time series of suspended sediment concentration at a "point", was developed by Downing et al. (1981). During a recent field experiment a vertical array of 5 of these optical backscatter sensors and a colocated flow meter was deployed close to the sea bed. These colocated measurements provide a unique opportunity to investigate the response of near-bed suspended sediment concentration to the wave-induced flow.

scholarly journals 3D Modeling and Mechanism Analysis of Breaking Wave-Induced Seabed Scour around Monopile

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xiaojian Liu ◽  
Cheng Liu ◽  
Xiaowei Zhu ◽  
Yong He ◽  
Qisong Wang ◽  
...  
Keyword(s):  
Shear Stress ◽  
Sediment Transport ◽  
Stokes Equations ◽  
Volume Fraction ◽  
Laboratory Data ◽  
Suspended Load ◽  
Breaking Wave ◽  
Offshore Structure ◽  
Nearshore Sediment Transport ◽  
Wave Induced

Breaking wave-induced scour is recognized as one of the major causes of coastal erosion and offshore structure failure, which involves in the full 3D water-air-sand interaction, raising a great challenge for the numerical simulation. To better understand this process, a nonlinear 3D numerical model based on the open-source CFD platform OpenFOAM® was self-developed in this study. The Navier–Stokes equations were used to compute the two-phase incompressible flow, combining with the finite volume method (FVM) to discretize calculation domain, a modified VOF method to track the free surface, and a k−ε model to closure the turbulence. The nearshore sediment transport process is reproduced in view of shear stress, suspended load, and bed load, in which the terms of shear stress and suspended load were updated by introducing volume fraction. The seabed morphology is updated based on Exner equation and implemented by dynamic mesh technique. The mass conservative sand slide algorithm was employed to avoid the incredible vary of the bed mesh. Importantly, a two-way coupling method connecting the hydrodynamic module with the beach morphodynamic module is implemented at each computation step to ensure the fluid-sediment interaction. The capabilities of this model were calibrated by laboratory data from some published references, and the advantages/disadvantages, as well as proper recommendations, were introduced. Finally, nonbreaking- and breaking wave-induced scour around the monopile, as well as breaking wave-induced beach evolution, were reproduced and discussed. This study would be significantly helpful to understand and evaluate the nearshore sediment transport.

A two-phase approach to wave-induced sediment transport under sheet flow conditions

2011 ◽  
Vol 58 (11) ◽  
pp. 1072-1088 ◽  
Author(s):  
Xin Chen ◽  
Yong Li ◽  
Xiaojing Niu ◽  
Daoyi Chen ◽  
Xiping Yu
Keyword(s):  
Sediment Transport ◽  
Flow Conditions ◽  
Sheet Flow ◽  
Two Phase ◽  
Phase Approach ◽  
Wave Induced

scholarly journals Wave-induced sediment transport and onshore sandbar migration

2006 ◽  
Vol 53 (10) ◽  
pp. 817-824 ◽  
Author(s):  
Tian-Jian Hsu ◽  
Steve Elgar ◽  
R.T. Guza
Keyword(s):  
Sediment Transport ◽  
Wave Induced ◽  
Sandbar Migration

scholarly journals Large eddy simulation of sediment transport over rippled beds

2014 ◽  
Vol 1 (1) ◽  
pp. 755-801
Author(s):  
J. C. Harris ◽  
S. T. Grilli
Keyword(s):  
Sediment Transport ◽  
Large Eddy Simulation ◽  
Flow Model ◽  
Near Field ◽  
Ocean Engineering ◽  
Mean Flow ◽  
Eddy Simulation ◽  
Turbulent Statistics ◽  
Large Eddy ◽  
Wave Induced

Abstract. Wave-induced Boundary Layer (BL) flows over sandy rippled bottoms are studied using a numerical model that applies a one-way coupling of a "far-field" inviscid flow model to a "near-field" Large Eddy Simulation (LES) Navier–Stokes (NS) model. The incident inviscid velocity and pressure fields force the LES, in which near-field, wave-induced, turbulent bottom BL flows are simulated. A sediment suspension and transport model is embedded within the coupled flow model. The numerical implementation of the various models has been reported elsewhere, where we showed that the LES was able to accurately simulate both mean flow and turbulent statistics for oscillatory BL flows over a flat, rough bed. Here, we show that the model accurately predicts the mean velocity fields and suspended sediment concentration for oscillatory flows over full-scale vortex ripples. Tests show that surface roughness has a significant effect on the results. Beyond increasing our insight into wave-induced oscillatory bottom BL physics, models of sediment transport as sophisticated as the present coupled model have the potential to make quantitative predictions of sediment transport and erosion/accretion around partly buried objects in the bottom, which is important for a vast array of bottom deployed instrumentation and other practical ocean engineering problems.

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