Wave overtopping and splash-up at seawalls with bullnose
Keywords:Bullnose, overtopping, physical model, seawall, splash-up, wave flume.
Seawalls have been erected to protect hundreds of towns and tourism areas stretching along the coast of Vietnam. During storm surges or high tides, wave overtopping and splash-up would often threaten the safety of infrastructures, traffic and residents on the narrow land behind. Therefore, this study investigates these wave-wall interactions via hydraulic small scale model tests at Thuyloi University. Remarkably, the structure models were shaped to have different seaward faces and bullnoses. The wave overtopping discharge and splash run-up height at seawalls with bullnose are significantly smaller than those without bullnose. Furthermore, the magnitude of these decreasing effects is quantitatively estimated.
Wang, L., Xie, Y., Wu, Y., Guo, Z., Cai, Y., Xu, Y., and Zhu, X., 2012. Failure mechanism and conservation of the ancient seawall structure along Hangzhou bay, China. Journal of Coastal Research, 28(6), 1393–1403. https://doi.org/10.2112/JCOASTRES-D-12-00036.1.
Goda, Y., Kishara, Y., and Kamiyama, Y., 1975. Laboratory investigation on the overtopping rate of seawalls by irregular waves. Report of the Port and Harbour Research Institute, 14(4).
Napp, N., Pearson, J., Bruce, T., and Allsop, W., 2004. Violent overtopping of vertical seawalls under oblique wave conditions. In Coastal Structures 2003 (pp. 528–541).
Gotoh, H., Ikari, H., Memita, T., and Sakai, T., 2005. Lagrangian particle method for simulation of wave overtopping on a vertical seawall. Coastal Engineering Journal, 47(2–3), 157–181. https://doi.org/10.1142/S0578563405001239.
Pullen, T., Allsop, W., Bruce, T., and Pearson, J., 2009. Field and laboratory measurements of mean overtopping discharges and spatial distributions at vertical seawalls. Coastal Engineering, 56(2), 121–140. https://doi.org/10.1016/j.coastaleng.2008.03.011.
Pearson, J., Bruce, T., Allsop, W., Kortenhaus, A., and van der Meer, J. E. N. T. S. J. E., 2005. Effectiveness of recurve walls in reducing wave overtopping on seawalls and breakwaters. In Coastal Engineering 2004: (In 4 Volumes) (pp. 4404–4416). https://doi.org/10.1142/97898127019160355.
Hunt, I. A., 1958. Design of seawalls and breakwaters. US Lake Survey.
Besley, P., 1998. Wave overtopping of seawalls, design and assessment manual. R&D technical report W178.
Thomas, R. S., and Hall, B., 2015. Seawall design. Butterworth-Heinemann.
Hughes, S. A., 1993. Physical models and laboratory techniques in coastal engineering (Vol. 7). World Scientific.
Zanuttigh, B., Formentin, S. M., and van der Meer, J. W., 2016. Prediction of extreme and tolerable wave overtopping discharges through an advanced neural network. Ocean Engineering, 127, 7–22. https://doi.org/10.1016/j.oceaneng.2016.09.032.
Pullen, T., Allsop, N. W. H., Bruce, T., Kortenhaus, A., Schüttrumpf, H., and van der Meer, J. W., 2007. EurOtop wave overtopping of sea defences and related structures: assessment manual.
Bruce, T., van der Meer, J., Pullen, T., and Allsop, W., 2010. Wave overtopping at vertical and steep structures. In Handbook of Coastal and Ocean Engineering (pp. 411–439). https://doi.org/10.1142/ 97898128193070016.
Kortenhaus, A., Pearson, J., Bruce, T., Allsop, N. W. H., and van der Meer, J. W., 2004. Influence of parapets and recurves on wave overtopping and wave loading of complex vertical walls. In Coastal Structures 2003 (pp. 369–381).
Raichlen, F., Li, Y., Poon, Y., and Boudreau, R., 2001. Splash-Up and Overtopping of Shoreline Structures. In Coastal Engineering 2000 (pp. 2128–2141). https://doi.org/10.1061/40549(276)166.