SCOUR PROTECTION AROUND A SINGLE SLENDER PILE EXPOSED TO WAVES

  • Sara Corvaro
  • Francesco Marini
  • Alessandro Mancinelli
  • Carlo Lorenzoni

Abstract

The study of the scour around a monopile foundation and, in particular, the evaluation of the performance of alternative scour protection systems made of geotextile sand containers (GSCs) are here presented. Different configurations of the scour protection system were experimentally analyzed. The scour protection efficiency has been tested with both regular and random waves. A design dynamic formula for the scour protections is developed based on the stability of the GSC and, hence, on the evaluation of the weight of the geotextile sand container by means of the stability number. A damage level has been defined and related with the modified stability number. The paper provides useful information for the design of the scour protections made of geotextile sand containers, for the evaluation of the performance of such systems in terms of scour reduction, sinking and damage level of the scour protections.

References

Ahrens, J.P. (1984): Reef type breakwaters. Proceedings of 19th Conference on Coastal Engineering, Houston, Texas, U.S.A., https://doi.org/10.9753/icce.v19.%25p

Corvaro, S., Marini, F., Mancinelli, A., Lorenzoni, C. and Brocchini, M. (2018): Hydro- and Morpho-dynamics induced by a vertical slender pile under regular an-d random waves. Journal of Waterway, Port, Coastal, and Ocean Engineering, ASCE, 144(6), 04018018, https://doi.org/10.1061/(ASCE)WW.1943-5460.0000470

Corvaro, S., Seta, E., Mancinelli, A. and Brocchini, M. (2014): Flow dynamics on a porous medium. Coastal Engineering, 91, 280-298, https://doi.org/10.1016/j.coastaleng.2014.06.001

Corvaro, S., Lorenzoni, C. and Mancinelli, A. (2014): Physical models of geotextile sand containers for coastal protection structures. Proceedings of the 10th International Conference on Geosynthetics. Berlin, 21-25 September 2014.

De Vos, L., De Rouck, J., Troch, P. and Frigaard, P. (2011): Empirical design of scour protections around monopile foundations. Part 1: Static Approach. Coastal Engineering, 58, 540-533, https://doi.org/10.1016/j.coastaleng.2011.02.001

De Vos, L., De Rouck, J., Troch, P. and Frigaard, P. (2011): Empirical design of scour protections around monopile foundations. Part 2: Dynamic Approach. Coastal Engineering, 60, 286-298, https://doi.org/10.1016/j.coastaleng.2011.11.001

Hudson, R.Y. (1959): Laboratory investigation of rubble-mound breakwaters. Journal of Waterway, Port, Coastal and Ocean Division, ASCE, 85(3), 92-121.

Kirkegaard, L., Hebsgaard, M. and Jensen, O.J. (1998): Design of scour protection for the bridge piers of the Øresund link. Proceedings of 26th Conference on Coastal Engineering, Copenhagen, Denmark, https://doi.org/10.9753/icce.v26.%25p

Miozzi, M., Corvaro, S., Pereira, F.A. and Brocchini, M. (2018): Wave-induced morphodynamics and sediment transport around a slender vertical cylinder. Advances in Water Resources, 10.1016/j.advwatres.2018.01.025

Miozzi, M., Postacchini, M., Corvaro, S. and Brocchini, M. (2015): Whole-wavelength description of a wave boundary layer over permeable wall. Experiment in Fluids. 56 (6): 127. https://doi.org/10.1007/s00348-015-1989-4

Nielsen, A.W., Probst, T., Petersen, T.U. and Sumer, B.M. (2015): Sinking of armour layer around a vertical cylinder exposed to waves, Coastal Engineering, 100, 58-66, https://doi.org/10.1016/j.coastaleng.2015.03.010

Oud, J.C., (2002) Foundation design monopile - Comparison extra steel consumption versus scour protection, Doc. no. 67, Ballast Nedam Engineering, Nieuwegein, 13 May 2002.

Petersen, T.U., Sumer, B.M., Fredsøe, J., Raaijmakers, T.C. and Schouten, J.J. (2015): Edge scour at scour protections around piles in the marine environment - Laboratory and field investigation, Coastal Engineering, 106, 42-72, https://doi.org/10.1016/j.coastaleng.2015.08.007

Recio, J. and Oumeraci H. (2009): Process based stability formulae for coastal structures made of geotextile sand containers. Coastal Engineering, 56, 632-658, https://doi.org/10.1016/j.coastaleng.2009.01.011

Sumer, B.M. and Fredsøe, J. (2002): The mechanics of scour in the Marine Environment. Advanced series on Ocean Engineering. World Scientific.

Tanimoto, K. (1982): Report of the Port and Harbour Research Institute. Ministry of Transport, Vol. 21(3) (Japanese).

Van der Meer, J.W. (1987): Stability of breakwater armour layers - Design formulae. Coastal Engineering, 11, 219-239, https://doi.org/10.1016/0378-3839(87)90013-5

Whitehouse, R.J. S., Sutherland, J. and Harris, J.M. (2011): Evaluating scour at marine gravity foundations (2011). Maritime Engineering, 164(4),143-157, 10.1680/maen.2011.164.4.143

Whitehouse, R.J.S., Brown, A., Audenaert, S., Bolle A., de Schoesitter, P., Haerens, P., Baelus L., Troch, P., das Neves, L., Ferradosa, T. and Pinto, F. (2014): Optimising scour protection stability at offshore foundations. Proceeding of 7th International conference on scour and erosion. Perth, 2-4 December 2014.

Published
2018-12-30
How to Cite
Corvaro, S., Marini, F., Mancinelli, A., & Lorenzoni, C. (2018). SCOUR PROTECTION AROUND A SINGLE SLENDER PILE EXPOSED TO WAVES. Coastal Engineering Proceedings, 1(36), papers.6. https://doi.org/10.9753/icce.v36.papers.6