DISTRIBUTION OF WAVE LOADS FOR DESIGN OF CROWN WALLS IN DEEP AND SHALLOW WATER

Jørgen Quvang Harck Nørgaard, Thomas Lykke Andersen

Abstract


This paper puts forward a new method to determine horizontal wave loads on rubble mound breakwater crown walls with specific exceedance probabilities based on the formulae by Nørgaard et al. (2013) as well as presents a new modified version of the wave run-up formula by Van der Meer & Stam (1992). Predictions from the method are compared to measured horizontal wave loads from scaled model tests, and the new method provides results which are in agreement with measured values as long as the wave loads on the crown wall are relatively impulsive. Another aim of the paper has been to compare the displacements of a crown wall exposed to wave loads with different exceedance probabilities in an overload situation (in this case the loads exceeded by 0.1 % and 1/250 of the incident waves). The comparison is made using the assumption that the Eigenfrequency of the crown wall and breakwater is significantly higher than the dynamic wave load impulses on the structure. The relatively small difference in the evaluated exceedance probabilities has a significant influence on the displacement of the monolithic structure. Therefore, probabilistic design tools are recommended. Tools from the present paper will be used in future studies in more detailed investigations on the influence from the load exceedance probability on the stability of crown walls.

Keywords


rubble mound breakwater; crown wall; sliding; physical modeling; design wave load

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References


AWASYS (2013). “Wave Generation Software”, Department of Civil Engineering, Aalborg

University. http://www.hydrosoft.civil.aau.dk/awasys/

Battjes, J.A., and Groenendijk H.W. (2000). “Wave height distributions on shallow foreshores”, Coastal Engineering, 40, 161-182.

Burcharth, H. F., Andersen, L. & Lykke Andersen, T. (2008): “Analyses of Stability of Caisson Breakwaters on Rubble Foundation Exposed to Impulsive Loads”. Proc. of the 31st Int. Conf. on Coastal Eng.: Hamburg, Germany, pp. 3606-3618.

Caires, S., & Van Gent, M. (2012). “Wave Height Distribution in Constant and Finite Depths”. Coastal Engineering Proceedings, (33)

Cuomo, G., Allsop W., Bruce, T., & Pearson, J. (2010). ”Breaking wave loads at vertical seawalls and breakwaters”. Coastal Engineering, Volume 57, Issue 4, April 2010, Pages 424-439

Goda, Y., (2010). “Random Seas and Design of Maritime Structures”. Third Ed. World Scientific

Glukhovsky, B. H. (1966) “Issledovanie morskogo vetrovogo volnenia (Study of sea wind waves)”. Leningrad, Gidrometeoizdat (in Russian).

Kobayashi, N., de los Santos, F.J. and Kearney, P.G. (2008). "Time-Averaged Probabilistic Model for Irregular Wave Runup on Permeable Slopes". Journal of Waterway, Port, Coastal and Ocean Engineering, ASCE, 134(2), 88-96.

Lamberti, A., Martinelli, L., Gabriella Gaeta, M., Tirindelli, M., and Alderson, J (2011). “Experimental spatial correlation of wave loads on front decks.” Journal of Hydraulic Research, 2011, 49, 81-90

Longuet-Higgins, M. S. (1952). "On the Statistical Distribution of the Heights of Sea Waves". Journal of Marine Research, 11(3), PP. 245-266.

Martin F. L., Losada, M. A., Medina, R. (1999), “Wave loads on rubble mound breakwater crown walls”. Coastal Engineering, Vol. 37, Issue 2, July 1999, p. 149-174

Nørgaard, J. Q. H., “Upgrade and Design of Coastal Structures exposed to Climate Changes”. PhD thesis, DCE Thesis No. 51, Coastal Engineering Research Group, Dept. of Civil Engineering, Aalborg University, Denmark.

Nørgaard, J. Q. H., Andersen, L. V., Lykke Andersen, T., & Burcharth, H. F. (2012). “Displacement of monolithic Rubble-Mound Breakwater Crown-Walls”. Proceedings of the Thirtythird International Conference on Coastal Engineering (ICCE), Santander, Spain, July 1-6, 2012.

Nørgaard, J. Q. H., Lykke Andersen, T., Burcharth, H. F. (2013). ”Wave loads on rubble mound breakwater crown walls in deep and shallow water wave conditions”. Coastal Engineering, Volume 80, October 2013, Pages 137-147, ISSN 0378-3839

Nørgaard, J. Q. H., Lykke Andersen, T., & Burcharth, H. F. (2014). “Distribution of individual wave overtopping volumes in shallow water wave conditions”. Coastal Engineering (Elseveir) Vol. 83, January 2014, Pages 15–23, ISSN 0378‐3839, http://dx.doi.org/10.1016/j.coastaleng.2013.09.003.

Pedersen, J. (1996). “Wave Forces and Overtopping on Crown Walls of Rubble Mound Breakwaters”. PhD thesis, Series paper 12, ISBN 0909-4296, Hydraulics & Coastal Engineering Lab., Dept. of Civil Engineering, Aalborg University, Denmark.

Van der Meer, J.W. & Stam, C.J.M (1992). “Wave run-up on smooth and rock slopes”. ASCE, Journal of WPC and OE, Vol. 188, No. 5, pp. 534-550, New York.




DOI: https://doi.org/10.9753/icce.v34.structures.47