WAVE-INDUCED OVERWASH AND DESTRUCTION OF SAND DUNES
Proceedings of the 32nd International Conference
PDF

Keywords

overwash
dune erosion
sediment transport
numerical modeling

How to Cite

Figlus, J., Kobayashi, N., Gralher, C., & Iranzo, V. (2011). WAVE-INDUCED OVERWASH AND DESTRUCTION OF SAND DUNES. Coastal Engineering Proceedings, 1(32), sediment.34. https://doi.org/10.9753/icce.v32.sediment.34

Abstract

Numerical modeling of the rapid dune profile changes that may occur due to wave overtopping and sediment overwash during a storm is challenging. One of the reasons is the limited amount of available field and laboratory data related to the problem. Another reason is the complex interaction of hydrodynamics, morphological changes and sediment transport in the intermittently wet and dry zone of the dune profile. We modified the cross-shore numerical model CSHORE on the basis of three laboratory overwash tests with different dune geometries in front of a low-crested vertical wall to include the capability to predict profile evolution due to wave overtopping and overwash. Experimental results show that the transition from minor to major overwash is fairly rapid and that the resilience of the dune against destruction by wave-induced overwash is dependent on its geometry. Computed results compare well with the measured hydrodynamics, profile changes, wave overtopping rates and sediment overwash rates, requiring only one empirical parameter to be calibrated. Only the erosion in front of the vertical wall in the last phase of each test is not predicted well by the model. Additional comparisons with field data on profile evolution involving overwash verifies the field capabilities of CSHORE.
https://doi.org/10.9753/icce.v32.sediment.34
PDF

References

Donnelly, C., N. Kraus, and M. Larson. 2006. State of knowledge on measurement and modeling of coastal overwash, Journal of Coastal Research, 22/4, 965-991, July 2006. http://dx.doi.org/10.2112/04-0431.1

Figlus, J., N. Kobayashi, C. Gralher, and V. Iranzo. 2011. Wave overtopping and overwash of dunes, Journal of Waterway, Port, Coastal, and Ocean Engineering, 137(1), 26-33.http://dx.doi.org/10.1061/(ASCE)WW.1943-5460.0000060

Figlus, J., N. Kobayashi, and C. Gralher. 2011. Onshore migration of emerged ridge and ponded runnel, Journal of Waterway, Port, Coastal, and Ocean Engineering, (submitted).

Holland, K.T., R.A. Holman, and A.H. Sallenger Jr. 1991. Estimation of overwash bore velocities using video techniques, Coastal Sediments '91, ASCE, volume 1, 489-487.

Kobayashi, N., A. Farhadzadeh, J.A. Melby, B.D. Johnson, and M. Gravens. 2010. Wave overtopping of levees and overwash of dunes, Journal of Coastal Research, 26(5), 888-900. http://dx.doi.org/10.2112/JCOASTRES-D-09-00034.1

Kobayashi, N., M. Buck, A. Payo, and B.D. Johnson. 2009. Berm and dune erosion during a storm, Journal of Waterway, Port, Coastal, and Ocean Engineering, 135(1), 1-10.http://dx.doi.org/10.1061/(ASCE)0733-950X(2009)135:1(1)

Kobayashi, N., G.DeSilva, and K. Watson. 1989. Wave transformation and swash on gentle and steep slopes, Journal of Geophysical Research, 94(C1), 951-966.http://dx.doi.org/10.1029/JC094iC01p00951

Kobayashi, N., M. Herrman, B.D. Johnson, and M. Orzech. 1998. Probability distribution of surface elevation in surf and swash zones, Journal of Waterway, Port, Coastal, and Ocean Engineering, 124(3), 99-107. http://dx.doi.org/10.1061/(ASCE)0733-950X(1998)124:3(99)

Kobayashi, N., D.T. Cox, and A. Wurjanto. 1990. Irregular wave reflection and run-up on rough impermeable slopes, Journal of Waterway, Port, Coastal, and Ocean Engineering, 116(6), 708-726. http://dx.doi.org/10.1061/(ASCE)0733-950X(1990)116:6(708)

Kobayashi, N., A. Payo, and L. Schmied. 2008. Cross-shore suspended sand and bed load transport on beaches, Journal of Geophysical Research, 113(C07001).

Wise, R.A, S. Smith, and M. Larson. 1996. SBEACH: Numerical model for simulating storm-induced beach change. Report 4. Cross-shore transport under random waves and model validation with SUPERTANK and field data, Technical Report CECR-89-9, U.S. Army Engineer Waterways Experiment Station.

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.