STABILITY OF BREAKWATER ROUNDHEADS DURING CONSTRUCTION

Marcel R.A. Van Gent, Ivo Van der Werf

Abstract


The presented study focussed on issues related to the hydraulic stability during the construction of rubble mound breakwaters. During construction the temporary roundheads differ from the roundheads in the final stage. Often a submerged uncompleted part of the breakwater is present in front of the section that reached its final crest elevation. This can occur because often the breakwater is being constructed with maritime-based equipment up to a certain elevation while the upper part of the breakwater is being constructed with land-based equipment. Three-dimensional physical model tests were performed to analyse the influence of the submerged part on the stability of the emerged part. The locations incurring the most damage clearly differ. Furthermore, for some combinations of water level, wave direction and structure geometry more damage was found for structures with a submerged part, although most combinations showed that the amount of displaced stones is generally lower for the structures with a submerged part.

Keywords


rubble-mound breakwaters; roundhead; rock slopes; wave basin; construction; wave loading

References


Jensen, O.J. 1984. A monograph on rubble mound breakwaters, DHI, Hørsholm.

Maciñeira, E. and H.F. Burcharth. 2008. Spatial damage distribution over cube armoured roundheads, Proc. ICCE 2008, World Scientific, Vol.4. pp.3449-3460.

Matsumi, Y., E.P.D. Mansard and J. Rutledge. 1994. Influence of wave directionality on stability of breakwater heads, Proc. ICCE 1994, ASCE, Vol.2., pp.1397-1411.

Matsumi, Y., A. Kimura and K. Ohno. 1996. Velocity field measurements over breakwater heads under 3D waves, Proc. ICCE 1996, ASCE, Vol.2., pp.1776-1788.

Matsumi, Y., A. Kimura and K. Ohno. 1998. Wave kinematics on breakwater heads and stability or armour layers under multidirectional waves, Proc. ICCE 1998, ASCE, Vol.2., pp.1906-1919.

Matsumi, Y., A. Kimura and K. Ohno. 2000. Stability of armour units on breakwater heads under multidirectional waves, Proc. ICCE 2000, ASCE, Vol.3., pp.1946-1958.

Vidal. C, M.A. Losada and R. Medina. 1991. Stability of mound breakwater's head and trunk, J. of Waterway, Port, Coastal and Ocean Engrg, ASCE, Vol. 177, No.6 Nov/Dec, pp.570-587.http://dx.doi.org/10.1061/(ASCE)0733-950X(1991)117:6(570)

Van Gent, M.R.A., P. Tönjes, H.A.H. Petit and P. van den Bosch. 1994. Wave action on and in permeable structures, Proc. ICCE 1994, ASCE, Vol.2, pp.1739-1753.

Van Gent, M.R.A. 1995. Porous flow through rubble mound material, J. of Waterway, Port, Coastal and Ocean Engineering, Vol.121, no.3, pp.176-181, ASCE, New York, by M.R.A. van Gent.http://dx.doi.org/10.1061/(ASCE)0733-950X(1995)121:3(176)

Wellens, P.R., M.J.A. Borsboom and M.R.A. van Gent. 2010. 3D modelling of wave interaction with permeable coastal structures, Proc. ICCE 2010.

PMCid:2881346

Wolters, G. and M.R.A. van Gent. 2010. Oblique wave attack on cube and rock armoured rubble mound breakwaters, Proc. ICCE 2010.


Full Text: PDF

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