[ report an error in this record ]basket (1): add | show Print this page
one publication added to basket [229694]
Analysis of overtopping flow on sea dikes in oblique and short-crested waves
Nørgaard, J.Q.H.; Andersen, T.L.; Burcharth, H.F.; Steendam, G.J. (2013). Analysis of overtopping flow on sea dikes in oblique and short-crested waves. Coast. Eng. 76: 43-54. http://dx.doi.org/10.1016/j.coastaleng.2013.01.012
Peer reviewed article  
Available in  Authors 
Keywords
    Flow velocity
    Water waves > Surface water waves > Short-crested waves
    Wave processes on beaches > Wave runup
    Marine/Coastal
Author keywords
    Physical model tests; Sea dike; Flow depth; Dike resilience; Wave overtopping
Project Top | Authors 
  • Innovative coastal technologies for safer European coasts in a changing climate, more
Authors  Top 
  • Nørgaard, J.Q.H.
  • Andersen, T.L., more
  • Burcharth, H.F.
  • Steendam, G.J., more
Abstract
    Dike resilience against wave overtopping has gained more and more attention in recent years due to the effect of expected future climate changes. The overtopping flow velocities and flow depths on dikes have recently been studied in 2D small-scale experiments. This has led to semi-empirical formulae for the estimation of flow depths and flow velocities across a dike. The results have been coupled to the actual erosion of the landward dike slope determined by full-scale 2D tests using the so-called “Overtopping Simulator”. This paper describes the results from 96 small-scale tests carried out in a shallow water basin at Aalborg University to cover the so far unknown 3D effects from oblique long-crested and short-crested waves. Based on results from the laboratory tests, expansions are proposed to the existing 2D formulae so as to cover oblique and short-crested waves. The wave obliquity is seen to significantly reduce the overtopping flow velocities and flow depths on especially the landward slope of a sea dike. Moreover, the tests showed that the average flow directions on the dike crest from oblique long-crested and short-crested waves correspond approximately to the incident wave direction. Flow depths and the squared flow velocities on the dike are concluded to be Rayleigh-distributed in case of both long-crested and short-crested waves for all considered incident wave obliquities. Findings in the present paper are needed to obtain more realistic estimates of dike erosion caused by wave overtopping.
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors 
EU logo

THESEUS is funded by the European Commission within FP7-THEME 6 - Environment, including climate.
Grant 244104
1 December 2009 - 30 November 2013
Website developed and maintained by VLIZ

 7 logo