AbstractAt straight sandy coasts, wave-induced processes often lead to intriguing alongshore-variable morphology on spatial scales from 10s - 1000s of meters. Observations have shown that the horns of crescentic bars may separate from the bar during storms and subsequently migrate onshore towards the beach during calmer periods as a spatially coherent structure, termed Shoreward Propagating Accretionary Wave, or SPAW. Here, we aim to (1) quantify the morphological evolution of a SPAW and (2) unravel the physical processes underlying its onshore migration and spatial coherence. To do so, we studied onshore migration of a SPAW using a process-based morphodynamic model.
Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/5P22G_S0FJM
Bouvier, Balouin, Castelle (2017) : Video monitoring of sandbar-shoreline response to an offshore submerged structure at a microtidal beach. Geomorphology, 295, 297-305.
Bouvier, Castelle, Balouin (2019) : Modeling the impact of the implementation of a submerged structure on surf zone sandbar dynamics. Journal of Marine Science and Engineering, 7(4), 117.
Bouvier, C.; Balouin Y.; Castelle B., and Valentini N., 2020. Video depth inversion at a microtidal site exposed to prevailing low-energy short-period waves and episodic severe storms. In: Malvárez, G. and Navas, F. (eds.), Global Coastal Issues of 2020. Journal of Coastal Research, Special Issue No. 95, pp. 1021–1026. Coconut Creek (Florida), ISSN 0749-0208.
Castelle, B., V. Marieu, S. Bujan, K. D. Splinter, A. Robinet, N. Sénéchal, and S. Ferreira (2015), Impact of the winter 2013–2014 series of severe Western Europe storms on a double barred sandy coast : Beach and dune erosion and megacusp embayments, Geomorphology, 238, 135–148, doi: 10.1016/J.GEOMORPH.2015.03.006.
Dubarbier, Castelle, Ruessink, Marieu (2017): Mechanisms controlling the complete accretionary beach state sequence. Geophys. Res. Lett, 44, 5645–5654.
Holman, Plant, Holland (2013): cBathy: a robust algorithm for estimating nearshore bathymetry, J. Geophys. Res.: Oceans 118, 2595–2609.
Price, van Kuik, de Wit, António, Ruessink (2017): Shoreward Propagating Accretionary Waves (SPAWs): Observations from a multiple sandbar system, Proceedings Coastal Dynamics 2017, pp. 1081-1089.
Wijnberg, Holman (2007): Video-observations of shoreward propagating accretionary waves, Proceedings of the RCEM, 2007, 737-743.
This work is licensed under a Creative Commons Attribution 4.0 International License.