scholarly journals Modeling swash zone sediment transport at Truc Vert Beach

2012 ◽  
Vol 1 (33) ◽  
pp. 105 ◽  
Author(s):  
Arnold Van Rooijen ◽  
Ad Reniers ◽  
Jaap Van Thiel de Vries ◽  
Chris Blenkinsopp ◽  
Robert McCall
Keyword(s):  
Sediment Transport ◽  
Shallow Water ◽  
Water Level ◽  
Morphological Change ◽  
Shallow Water Equations ◽  
Transport Model ◽  
Early Spring ◽  
Swash Zone ◽  
One Dimensional ◽  
Run Up

A one-dimensional hydrostatic version of the XBeach model (Roelvink et al., 2009) is applied to hindcast swash morphodynamics measured during an accretive, and an erosive tide at Le Truc Vert beach (France) in early spring 2008 (Masselink et. al, 2009; Blenkinsopp et al., 2011). Swash hydrodynamics are solved by applying the nonlinear shallow water equations, and sediment transport rates are obtained from a combined intra-wave Nielsen and Bagnold type transport model. Reasonable predictions of morphological change in the swash were obtained. Nevertheless, the model underpredicts the water level setup and/or wave run-up during the accretive tide, which is hypothesized to be related to 2D-effects.

scholarly journals NUMERICAL AND EXPERIMENTAL DESCRIPTION OF THE FLOW, BOUNDARY LAYER AND BED EVOLUTION IN BORE-DRIVEN SWASH ON A COARSE SEDIMENT BEACH

2012 ◽  
Vol 1 (33) ◽  
pp. 33 ◽  
Author(s):  
Riccardo Briganti ◽  
Nicholas Dodd ◽  
Dubravka Pokrajac ◽  
Tom O'Donoghue
Keyword(s):  
Sediment Transport ◽  
Shallow Water Equations ◽  
Swash Zone ◽  
Coupled Numerical Model ◽  
Stress Prediction ◽  
Bed Evolution ◽  
Run Up ◽  
Momentum Integral ◽  
The University ◽  
Fully Coupled

The paper presents the results of a comparison between a fully coupled numerical model for the hydro- and morphodynamics of the swash zone. The model solves simultaneously the Non-Linear Shallow Water Equations and the Exner equation for the bed updates. The model uses the simple Grass formula for the sediment transport and the momentum integral method for the bottom shear stress prediction. The laboratory tests were carried out at the University of Aberdeen swash facility and aimed at studying the hydrodynamics and sediment transport of a single, bore-generated swash event. The comparison is carried out in terms of water depth and horizontal velocity (depth average and profiles) and sediment transport. The model performs well in predicting these quantities, above all during the run-up.

scholarly journals A coupled modelling effort to study the fate of contaminated sediments downstream of the Coles Hill deposit, Virginia, USA

2015 ◽  
Vol 367 ◽  
pp. 272-280 ◽  
Author(s):  
C. F. Castro-Bolinaga ◽  
E. R. Zavaleta ◽  
P. Diplas
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Uranium Deposit ◽  
Ground Surface ◽  
Ansys Fluent ◽  
Mining Site ◽  
One Dimensional ◽  
Coupled Modelling ◽  
Modelling Effort ◽  
Modelling Process

Abstract. This paper presents the preliminary results of a coupled modelling effort to study the fate of tailings (radioactive waste-by product) downstream of the Coles Hill uranium deposit located in Virginia, USA. The implementation of the overall modelling process includes a one-dimensional hydraulic model to qualitatively characterize the sediment transport process under severe flooding conditions downstream of the potential mining site, a two-dimensional ANSYS Fluent model to simulate the release of tailings from a containment cell located partially above the local ground surface into the nearby streams, and a one-dimensional finite-volume sediment transport model to examine the propagation of a tailings sediment pulse in the river network located downstream. The findings of this investigation aim to assist in estimating the potential impacts that tailings would have if they were transported into rivers and reservoirs located downstream of the Coles Hill deposit that serve as municipal drinking water supplies.

scholarly journals BEACHFACE EVOLUTION UNDER TWO SWASH EVENTS BY TWO SOLITARY WAVES

2018 ◽  
pp. 16
Author(s):  
Fangfang Zhu ◽  
Nicholas Dodd
Keyword(s):  
Energy Dissipation ◽  
Sediment Transport ◽  
Numerical Simulations ◽  
Morphological Change ◽  
Solitary Waves ◽  
Shear Stresses ◽  
Swash Zone ◽  
Numerical Work ◽  
Shock Interactions ◽  
Bed Shear Stresses

Swash zone morphodynamics is of great signi cance for nearshore morphological change, and it is important to provide reliable numerical prediction for beachface evolution in the swash zone. Most of the numerical work on swash zone morphodynamics carried out so far has focused primarily on beach evolution under one single swash event. In reality, multiple swash events interact, and these swash interactions have been recognised as important in the beachface evolution. Swash-swash interactions leads to energy dissipation, enhanced bed shear stresses and sediment transport (Puleo and Torres- Freyermuth, 2016). In this paper, we investigate the beachface evolution under two swash events using numerical simulations, in which shock-shock interactions are described by dam-break problems.

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