ANALYSIS OF THE PERFORMANCE OF DIFFERENT SEDIMENT TRANSPORT FORMULATIONS IN NON-HYDROSTATIC XBEACH

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

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Numerical modelling of intra-wave sediment transport on sandy beaches using a non-hydrostatic, wave-resolving model

Ocean Dynamics ◽

10.1007/s10236-020-01416-x ◽

2020 ◽

Vol 71 (1) ◽

pp. 1-20

Author(s):

Giulia Mancini ◽

Riccardo Briganti ◽

Robert McCall ◽

Nicholas Dodd ◽

Fangfang Zhu

Keyword(s):

Sediment Transport ◽

Numerical Modelling ◽

Large Scale ◽

Surf Zone ◽

Sediment Concentration ◽

Sandy Beaches ◽

Swash Zone ◽

Transport Modelling ◽

Wave Trains ◽

Sediment Transport Modelling

AbstractThe mutual feedback between the swash zone and the surf zone is known to affect large-scale morphodynamic processes such as breaker bar migration on sandy beaches. To fully resolve this feedback in a process-based manner, the morphodynamics in the swash zone and due to swash-swash interactions must be explicitly solved, e.g., by means of a wave-resolving numerical model. Currently, few existing models are able to fully resolve the complex morphodynamics in the swash zone, and none is practically applicable for engineering purposes. This work aims at improving the numerical modelling of the intra-wave sediment transport on sandy beaches in an open-source wave-resolving hydro-morphodynamic framework (e.g., non-hydrostatic XBeach). A transport equation for the intra-wave suspended sediment concentration, including an erosion and a deposition rate, is newly implemented in the model. Two laboratory experiments involving isolated waves and wave trains are simulated to analyse the performance of the model. Numerical results show overall better performance in simulating single waves rather than wave trains. For the latter, the modelling of the morphodynamic response improves in the swash zone compared with the existing sediment transport modelling approach within non-hydrostatic XBeach, while the need of including additional physical processes to better capture sediment transport and bed evolution in the surf zone is highlighted in the paper.

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On integrated sediment transport modelling for flash events in mountain environments

Acta Geophysica ◽

10.2478/s11600-011-0063-8 ◽

2011 ◽

Vol 60 (1) ◽

pp. 191-213 ◽

Cited By ~ 13

Author(s):

Alessio Radice ◽

Elisa Giorgetti ◽

Davide Brambilla ◽

Laura Longoni ◽

Monica Papini

Keyword(s):

Sediment Transport ◽

Transport Modelling ◽

Mountain Environments ◽

Sediment Transport Modelling

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Coupled fluid dynamics-sediment transport modelling of a Crater Lake break-out lahar: Mt. Ruapehu, New Zealand

Journal of Hydrology ◽

10.1016/j.jhydrol.2010.05.023 ◽

2010 ◽

Vol 388 (3-4) ◽

pp. 399-413 ◽

Cited By ~ 36

Author(s):

Jonathan L. Carrivick ◽

Vern Manville ◽

Alison Graettinger ◽

Shane J. Cronin

Keyword(s):

Fluid Dynamics ◽

New Zealand ◽

Sediment Transport ◽

Crater Lake ◽

Transport Modelling ◽

Sediment Transport Modelling

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Sediment Transport Modelling in a Macrotidal Estuary : Do We Need to Account for Consolidation Processes?

Coastal Engineering 1992 ◽

10.1061/9780872629332.238 ◽

1993 ◽

Author(s):

Pierre le Hir ◽

Nancy Karlikow

Keyword(s):

Sediment Transport ◽

Transport Modelling ◽

Macrotidal Estuary ◽

Sediment Transport Modelling

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2D Sediment Transport Modelling in High Energy River – Application to Var River, France

Procedia Engineering ◽

10.1016/j.proeng.2016.07.549 ◽

2016 ◽

Vol 154 ◽

pp. 536-543 ◽

Cited By ~ 8

Author(s):

Elodie Zavattero ◽

Mingxuan Du ◽

Qiang Ma ◽

Olivier Delestre ◽

Philippe Gourbesville

Keyword(s):

Sediment Transport ◽

High Energy ◽

Transport Modelling ◽

Sediment Transport Modelling

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One-dimensional sediment transport modelling with Engelund–Hansen and Ackers–White transport equations for the Lower Danube River

Acta hydrotechnica ◽

10.15292/acta.hydro.2021.08 ◽

2021 ◽

pp. 103-117

Author(s):

Davor Kvočka

Keyword(s):

Sediment Transport ◽

Negative Impact ◽

Statistical Tests ◽

Field Measurements ◽

River Basin Management ◽

Transport Equations ◽

Danube River ◽

Transport Modelling ◽

1D Modelling ◽

Sediment Transport Modelling

Sediment transport can have a negative impact on riparian environments, as it can lead to the deterioration of ecological diversity and increase flood risks. Sediment transport modelling is thus a key tool in river basin management and the development of river training structures. In this study, we examined the appropriateness of 1D modelling for total sediment transport loads using the Engelund–Hansen and Ackers–White transport equations for the Lower Danube River. The study evaluated the effect of sediment grading on the accuracy of 1D model results, the appropriateness of 1D sediment transport modelling within technical or engineering projects, and the appropriateness of the Engelund–Hansen and Ackers–White equations for estimating sediment yield in the area of the Lower Danube River. The model results have been compared to field measurements, with the accuracy of the modelling results being evaluated with statistical tests. The obtained results show: (i) the sediment grading does not have a significant impact on the 1D modelling results, (ii) 1D sediment transport modelling gives sufficiently accurate results for practical engineering use (e.g. the estimation of dredging activities), and (iii) the Engelund–Hansen equation is generally better for sediment transport modelling in the Lower Danube River.

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