Shafiei H., Chauchat J., Bonamy C., Marchesiello Patrick. (2023). Adaptation of the SANTOSS transport formula for 3D nearshore models : application to cross-shore sandbar migration. Ocean Modelling, 181, p. 102138 [34 p.]. ISSN 1463-5003.
Titre du document
Adaptation of the SANTOSS transport formula for 3D nearshore models : application to cross-shore sandbar migration
Shafiei H., Chauchat J., Bonamy C., Marchesiello Patrick
Source
Ocean Modelling, 2023,
181, p. 102138 [34 p.] ISSN 1463-5003
The ability to model bar migration in the nearshore zone is critically important for predicting coastal morphology. We present a cost-effective wave-averaged 3D model (CROCO) with parameterization of wave -related bedload transport (adapted SANTOSS), and evaluate/calibrate its performance in comparison with data measured in a two-dimensional wave channel. In this model, suspended-load transport (both in and above the wave bottom boundary layer) is resolved by the flow model. We assume that if the tuning parameters are not robust to varying forcing conditions, the parameterization can be considered a failure. The present work is therefore a first step towards a numerical model capable of predicting the onshore and offshore migration of a sandbar under storm and post-storm conditions using the same set of parameters. One way to achieve this goal is to treat the effects of waves and currents in separate formulations to avoid conflicts and redundancy. We show that the implementation and adaptation of SANTOSS in CROCO can achieve this goal, provided that the hydrodynamics are accurately reproduced and the separation between the wave-related bedload and current-related suspended load formulations is respected.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Limnologie physique / Océanographie physique [032]
;
Géologie et formations superficielles [064]
