TY - JOUR
T1 - Depth-Resolved Modelling of Intra-Swash Morphodynamics Induced by Solitary Waves
AU - Kranenborg, Joost W.M.
AU - Campmans, Geert H.P.
AU - Jacobsen, Niels G.
AU - van der Werf, Jebbe J.
AU - Reniers, Ad J.H.M.
AU - Hulscher, Suzanne J.M.H.
N1 - Funding Information:
This work is part of the research program Shaping The Beach with project number 16130, which is financed by the Netherlands Organisation for Scientific Research (NWO), with in-kind support by Deltares.
Publisher Copyright:
© 2022 by the authors.
PY - 2022/9
Y1 - 2022/9
N2 - We present a fully coupled 2DV morphodynamic model, implemented in OpenFOAM® that is capable of simulating swash-zone morphodynamics of sandy beaches. The hydrodynamics are described by the Reynolds-averaged Navier–Stokes (RANS) equations with a k−ω turbulence model and the Volume of Fluid (VoF) approach for discriminating between air and water. Sediment transport is described in terms of bedload and suspended load transport. We show that the default divergence scheme in OpenFOAM can become numerically unstable and lead to negative sediment concentrations, and propose a solution to avoid this problem. The model performance is assessed in terms of surface elevation, flow velocities, runup, suspended sediment concentrations, bed profile evolution and sediment transport volumes by comparing with measurements of field-scale (wave height of 0.6 m) solitary waves. The model shows reasonable agreement in terms of hydrodynamics and predicts the correct sediment transport volumes, although the deposition is predicted more onshore compared to the measurements. This is partially attributed to an overprediction of the runup. The model shows that the suspended sediment concentration displays a strong vertical dependence. These results show the potential of depth-resolving models in providing more insight into morphodynamic processes in the swash zone, particularly with respect to vertical structures in the flow and suspended sediment transport.
AB - We present a fully coupled 2DV morphodynamic model, implemented in OpenFOAM® that is capable of simulating swash-zone morphodynamics of sandy beaches. The hydrodynamics are described by the Reynolds-averaged Navier–Stokes (RANS) equations with a k−ω turbulence model and the Volume of Fluid (VoF) approach for discriminating between air and water. Sediment transport is described in terms of bedload and suspended load transport. We show that the default divergence scheme in OpenFOAM can become numerically unstable and lead to negative sediment concentrations, and propose a solution to avoid this problem. The model performance is assessed in terms of surface elevation, flow velocities, runup, suspended sediment concentrations, bed profile evolution and sediment transport volumes by comparing with measurements of field-scale (wave height of 0.6 m) solitary waves. The model shows reasonable agreement in terms of hydrodynamics and predicts the correct sediment transport volumes, although the deposition is predicted more onshore compared to the measurements. This is partially attributed to an overprediction of the runup. The model shows that the suspended sediment concentration displays a strong vertical dependence. These results show the potential of depth-resolving models in providing more insight into morphodynamic processes in the swash zone, particularly with respect to vertical structures in the flow and suspended sediment transport.
KW - swash zone
KW - sediment transport
KW - morphodynamical modelling
KW - depth-resolving model
KW - intra-swash
KW - solitary wave
U2 - 10.3390/jmse10091175
DO - 10.3390/jmse10091175
M3 - Article
SN - 2077-1312
VL - 10
SP - 1
EP - 23
JO - Journal of marine science and engineering
JF - Journal of marine science and engineering
IS - 9
M1 - 1175
ER -