Abstract
Process-based, wave-resolving models are essential tools to resolve the complex hydro-morphodynamics in the swash zone. The open-source Non-Hydrostatic XBeach model can solve the depth-averaged wave-by-wave flow in the nearshore region up to the shoreline and the intra-wave bed changes during time-varying storms. However, validation and testing of its morphological response are still limited in the context of sandy beaches. This work aims to assess the performance of the wave-resolving sediment dynamics modelling within Non-Hydrostatic XBeach for different sediment transport formulations. The sediment transport modelling approaches considered in this study were tested and compared to laboratory experiments involving wave trains over an intermediate beach. Numerical results show a better performance in the prediction of the intra-swash sediment dynamics when the newly implemented wave resolving transport equation is applied compared to the existing approach within the model.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/2sy-Dr8iJ1M
Highlights
Process-based, wave-resolving models are essential tools to resolve the complex hydro-morphodynamics in the swash zone
The performance of XBNH-IWST was compared with the existing XBNH-WAST approach, originally developed and validated for the wave-averaged version of XBeach
Numerical results showed that XBNH-IWST better describes the bed changes in the upper and lower swash regions with respect to XBNH-WAST, both quantitatively and qualitatively
Summary
Process-based, wave-resolving models are essential tools to resolve the complex hydro-morphodynamics in the swash zone. The governing hydrodynamics equations of depth-averaged, wave-resolving models are the Non Linear Shallow Water Equations (NLSWE) (e.g., Postacchini et al, 2012; Zhu and Dodd, 2015; Incelli et al, 2016, see Briganti et al, 2016 for a review), the non-hydrostatic NLSWE (e.g., Smit et al, 2010; Ma et al, 2012; Ruffini et al, 2020), or the Boussinesq-type equations (e.g., Xiao et al, 2010; Kim et al, 2017) The former set of flow equations do not take into account the wave dispersion, limiting their application when compared to the latter two types of equations. There is no knowledge of which is the best sediment transport approach to use within XBNH
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