QUANTIFYING NEARSHORE MORPHOLOGICAL RECOVERY TIME SCALES USING ARGUS VIDEO IMAGING: PALM BEACH, SYDNEY AND DUCK, NORTH CAROLINA
ICCE 2012 Cover Image
PDF

Keywords

Morphological resets
Storm impact
recovery time scales
ARGUS

How to Cite

Ranasinghe, R., Holman, R., de Schipper, M., Lippmann, T., Wehof, J., Duong, T. M., Roelvink, D., & Stive, M. (2012). QUANTIFYING NEARSHORE MORPHOLOGICAL RECOVERY TIME SCALES USING ARGUS VIDEO IMAGING: PALM BEACH, SYDNEY AND DUCK, NORTH CAROLINA. Coastal Engineering Proceedings, 1(33), sediment.24. https://doi.org/10.9753/icce.v33.sediment.24

Abstract

Time scales of post-storm nearshore morphological recovery and physical processes governing these time scales are poorly understood at present. The ability to predict nearshore morphological recovery time scales based on pre-, during- or post-resetting storm conditions is an essential requirement for building and validating scale aggregated models that operate at macro- and higher spatio-temporal scales. In this study, quality controlled ARGUS video derived beach states at Palm Beach, Sydney (4 years) and Duck, NC (2 years) and concurrent wave data are analysed to quantify the nearshore morphological recovery time scales (Tmr) and to determine the physical processes that may govern Tmr. The results show that Tmr is of the order of 5-10 days at these two beaches. Tmr is moderately positively correlated with the averaged longshore current over the 3 days immediately after the resetting storm, indicating that it might be possible to develop a predictor for Tmr based on wave conditions immediately after the resetting storm. Weak correlations are present between Tmr and several pre-storm, during-storm and post-storm parameters at the two sites. However, these correlations are inconsistent between the two sites. A thorough analysis employing long-term beach state and wave data at several different study sites is required to fully understand this phenomenon.
https://doi.org/10.9753/icce.v33.sediment.24
PDF

References

Battjes, J.A. 1974. Surf similarity, Proceedings of the International Conference on Coastal Engineering; No 14.

Brander, R.W. 1999 Field observations on the morphodynamic evolution of a low-energy rip current system. Marine Geology, 157 (3-4), pp. 199-217http://dx.doi.org/10.1016/S0025-3227(98)00152-2

Callaghan, D.P., Nielsen, P., Short, A., Ranasinghe, R., 2008. Statistical simulation of wave climate and extreme beach erosion. Coastal Engineering 55 (5), 375-390.http://dx.doi.org/10.1016/j.coastaleng.2007.12.003

Calvete, D., G. Coco, A. Falqués, and N. Dodd .2007. (un)predictability in rip channel systems, Geophys. Res. Lett., 34 (5).http://dx.doi.org/10.1029/2006GL028162

Castelle, B., V. Marieu, G. Coco, P. Bonneton, N. Bruneau, and B. G. Ruessink . 2012. On the impact of an offshore bathymetric anomaly on surf zone rip channels, J. Geophys. Res., 117.

Damgaard, J., N. Dodd, L. Hall, and T. Chesher. 2002. Morphodynamic modelling of rip channel growth, Coastal Engineering, 45, 199- 221http://dx.doi.org/10.1016/S0378-3839(02)00034-0

Drønen, N., and R. Deigaard. 2007. Quasi-three-dimensional modelling of the morphology of longshore bars, Coastal Engineering, 54 (3).http://dx.doi.org/10.1016/j.coastaleng.2006.08.011

Lippmannn, T. C. and R. Holman. 1990. The Spatial and Temporal Variability of Sand Bar Morphology. J. of Geophysical Research, 95: 11575-11590http://dx.doi.org/10.1029/JC095iC07p11575

Ojeda, E., J. Guillén, and F. Ribas. 2011. Dynamics of single barred embayed beaches, Marine Geology, 280 (14).

Price, T. D., and B. G. Ruessink. 2011. State dynamics of a double sandbar system, Continental Shelf Research, 31 (6).http://dx.doi.org/10.1016/j.csr.2010.12.018

Ranasinghe, R. G. Symonds, K. Black and R. Holman. 2004. Morphodynamics of Intermediate Beaches: A Video Imaging and Numerical Modelling Study. Coastal Engineering, Vol. 51, 629-655.http://dx.doi.org/10.1016/j.coastaleng.2004.07.018

Ranasinghe, R. D. Callaghan and M. J. F. Stive. 2012. Estimating coastal recession due to sea level rise: Beyond the Bruun Rule. Climatic Change, Vol 110: 561-574http://dx.doi.org/10.1007/s10584-011-0107-8

Reniers, A., J. A. Roelvink, and E. B. Thornton. 2004. Morphodynamic modeling of an embayed beach under wave group forcing, J. Geophys. Res., 109.

Smit, M. W. J., A. J. H. M. Reniers, B. G. Ruessink, and J. A. Roelvink. 2008. The morphological response of a nearshore double sandbar system to constant wave forcing, Coastal Engineering, 55 (10).http://dx.doi.org/10.1016/j.coastaleng.2008.02.010

Turner, I. L., D. Whyte, B. Ruessink, and R. Ranasinghe. 2007. Observations of rip spacing, persistence and mobility at a long, straight coastline, Marine Geology, 236 (3-4), 209-221,http://dx.doi.org/10.1016/j.margeo.2006.10.029

Wright, L. D. and A. D. Short. 1984. Morphodynamic Variability of Surf Zones and Beaches. Marine Geology, 56: 93 - 118.http://dx.doi.org/10.1016/0025-3227(84)90008-2

Wright, L.D., Short, A.D. and Green, M.O., 1985. Short-term changes in the morphodynamic states of beaches and surf zones: An empirical predictive model. Marine Geology, 62: 339--364.http://dx.doi.org/10.1016/0025-3227(85)90123-9

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.