Benchmarking of numerical models for wave overtopping at dikes with shallow mildly sloping foreshores: Accuracy versus speed
Lashley, C.; Zanuttigh, B.; Bricker, J.; van der Meer, J.; Altomare, C.; Suzuki, T.; Roeber, V.; Oosterlo, P. (2020). Benchmarking of numerical models for wave overtopping at dikes with shallow mildly sloping foreshores: Accuracy versus speed. Environ. Model. Softw. 130: 104740. https://dx.doi.org/10.1016/j.envsoft.2020.104740 In: Environmental Modelling & Software. Elsevier: Oxford. ISSN 1364-8152; e-ISSN 1873-6726, more |   |
| Keywords | Coastal protection > Coastal safety against extreme storms > Sea dikes
Numerical modelling
Marine/Coastal | | Author keywords | Infragravity wave; OpenFOAM; BOSZ; XBeach; SWASH; SWAN |
| Authors | | Top | - Lashley, C.
- Zanuttigh, B.
- Bricker, J.D.
- Van der Meer, J.
| - Altomare, C., more
- Suzuki, T., more
- Roeber, V.
- Oosterlo, P.
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| Abstract | Practitioners often employ diverse, though not always thoroughly validated, numerical models to directly or indirectly estimate wave overtopping (q) at sloping structures. These models, broadly classified as either phase-resolving or phase-averaged, each have strengths and limitations owing to the physical schematization of processes within them. Models which resolve the vertical flow structure or the full wave spectrum (i.e. sea-swell (SS) and infragravity (IG) waves) are considered more accurate, but more computationally demanding than those with approximations. Here, we assess the speed-accuracy trade-off of six well-known models for estimating (q), under shallow foreshore conditions. The results demonstrate that: i) (q) is underestimated by an order of magnitude when IG waves are neglected; ii) using more computationally-demanding models does not guarantee improved accuracy; and iii) with empirical corrections to incorporate IG waves, phase-averaged models like SWAN can perform on par, if not better than, phase-resolving models but with far less computational effort. |
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