IMPROVEMENTS IN DESCRIBING WAVE OVERTOPPING PROCESSES

Steven A Hughes, Christopher I Thornton, Jentsje W Van der Meer, Bryan N Scholl

Abstract


This paper presents a new empirical relation for the shape factor in the Weibull distribution that describes the distribution of overtopping wave volumes. This improvement increases the applicable range of the Weibull distribution from very low average overtopping discharges to large discharges resulting from combined wave overtopping and steady surge overflow at negative freeboards. The effect this improvement has on wave overtopping simulation is also discussed. Measured maximum flow thicknesses, velocities, and discharges from experiments of combined wave and surge overtopping are examined to learn more about the variability of these key parameters as a function of individual overtopping wave volumes. A key finding is that wave volumes containing the 2%-exceedance value of maximum velocity typically have maximum flow thicknesses well below the 2%-exceedance level, and vice-versa. Furthermore, the 2%-exceedance hydrodynamic parameters do not occur in the 2%-exceedance wave volumes. Finally, empirical relationships are developed for several parameters that showed strong trends.

Keywords


wave overtopping; overtopping simulators; overtopping wave distribution; overtopping parameters

References


Hughes, S. A. 2011. Adaptation of the levee erosional equivalence method for the Hurricane Storm Damage Risk Reduction System (HSDRRS)," ERDC/CHL TR-11-3, U.S. Army Engineer Research and Development Center, Vicksburg, Mississippi, 143pp.

Hughes, S. A., and Nadal, N. C. 2009. Laboratory study of combined wave overtopping and storm surge overflow of a levee, Coastal Engineering, Elsevier, Vol 56. No. 3, pp 244-259.http://dx.doi.org/10.1016/j.coastaleng.2008.09.005

Lorke, S., Brüning, A., Bornschein, A., Gilli, S., Krüger, N., Schüttrumpf, H., Pohl, R., Spano, M., and Werk, S. 2010a. Influence of wind and current on wave run-up and wave overtopping, Hydralab– FlowDike, Report 2009, 100pp.

Lorke, S., Brüning, A., Van der Meer, J. W., Schüttrumpf, H., Bornschein, A., Gilli, S., Pohl, R., Spano, M., Riha, J., Werk, S., and Schlütter, F. 2010b. On the effect of current on wave run-up and wave overtopping. Proceedings of the 32st International Conference Coastal Engineering, American Society of Civil Engineers. Available at: http://journals.tdl.org/ICCE/article/view/1388.

Schüttrumpf, H., Möller, J., and Oumeraci, H. 2002. Overtopping flow parameters on the inner slope of seadikes, Proceedings of the 28th International Coastal Engineering Conference, World Scientific, Vol 2, pp 2116-2127.

Schüttrumpf, H., and Oumeraci, H. 2005. Layer thicknesses and velocities of wave overtopping flow at seadikes, Coastal Engineering, Elsevier, Vol 52, pp 473-495.http://dx.doi.org/10.1016/j.coastaleng.2005.02.002

Van der Meer, J. W. 2010. Operating system of the US wave overtopping simulator, Manual, Van der Meer Consulting B.W., The Netherlands, 53pp.

Van der Meer, J. W., Snijders, W., and Regeling, E. 2006. The wave overtopping simulator, Proceedings of the 30th International Conference Coastal Engineering, American Society of Civil Engineers, Vol 5, pp. 4654-4666.

Van der Meer, J. W., Steendam, G. J., de Raat, G., and Bernardini, P. 2008. Further developments on the wave overtopping simulator, Proceedings of the 31st International Conference Coastal Engineering, American Society of Civil Engineers, Vol 4, pp. 2957-2969.

Van der Meer, J. W., and Janssen, W. 1995. Wave run-up and wave overtopping at dikes, In: Kabayashi and Demirbilek (Eds.), Wave Forces on Inclined and Vertical Wall Structures, American Society of Civil Engineers, pp 1-27.

Van der Meer, J. W., Hardeman, B., Steendam, G. J., Schüttrumpf, H., and Verheij, H. 2010. Flow depths and velocities at crest and inner slope of a dike, in theory and with the wave overtopping simulator, Proceedings of the 32st International Conference Coastal Engineering, American Society of Civil Engineers. Available at: http://journals.tdl.org/ICCE/article/view/1239.

Van Gent, M. R. 2002. Wave overtopping events at dikes, Proceedings of the 28th International Coastal Engineering Conference, World Scientific, Vol 2, pp 2203-2215.

Victor, L. 2012. Optimization of the hydrodynamic performance of overtopping wave energy converters: experimental study of optimal geometry and probability distribution of overtopping volumes, PhD dissertation, Department of Civil Engineering, Ghent University, Belgium.

Victor, L., Van der Meer, J. W., and Troch P. 2012. Probability distribution of individual wave overtopping volumes for smooth impermeable steep slopes with low crest freeboard, Coastal Engineering, Elsevier, Vol 64, pp 87–101.http://dx.doi.org/10.1016/j.coastaleng.2012.01.003


Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.