Will coastal towns survive the rising pressure, or better, the rising sea level in future decades? Waves overtop dikes, and the overtopping flow on the crest of the dike can cause damage. Wave impacts from these overtopping flows already became of interest in coastal engineering the past few years, but very little literature and almost no design formulae are available yet for irregular waves. This paper gives such design formulae for practical use. Experimental modeling at three different scales (small, middle and large scale) has been carried out to measure such impacts. The tested geometry was a smooth sloping dike (only non-breaking waves) with a promenade at crest level and a storm wall at the end of this promenade. The outcome of this paper are three methodologies to a) calculate wave impact forces on such a storm wall as a function of the hydraulic parameters; b) determine the (Weibull) distribution of all impacts in one test, with the shape and scale parameters also linked to the hydraulic parameters; and c) to provide an indirect approach to calculate the impact forces on the storm wall. In this last approach, the (distribution of the) individual overtopping waves are linked to the (distribution of the) overtopping flow parameters, which are then linked to the (distribution of the) impact forces. Finally, the empirical formulae from the aforementioned three methodologies are compared; analogies and differences are discussed, and guidance is provided to design storm walls against post overtopping impact forces. Results show that forces from waves overtopping the dikes are in the order of 20 to 40 kN/m prototype scale in the dimensionless freeboard (Rc/Hm0) range of 1 to 2. This is (much) lower compared to impact forces on vertical walls as calculated by the Shore Protection Manual.

Impacts on a storm wall caused by non-breaking waves overtopping a smooth dike slope / Van Doorslaer, Koen; Romano, Alessandro; De Rouck, Julien; Kortenhaus, Andreas. - In: COASTAL ENGINEERING. - ISSN 0378-3839. - ELETTRONICO. - 120:(2017), pp. 93-111. [10.1016/j.coastaleng.2016.11.010]

Impacts on a storm wall caused by non-breaking waves overtopping a smooth dike slope

ROMANO, ALESSANDRO;
2017

Abstract

Will coastal towns survive the rising pressure, or better, the rising sea level in future decades? Waves overtop dikes, and the overtopping flow on the crest of the dike can cause damage. Wave impacts from these overtopping flows already became of interest in coastal engineering the past few years, but very little literature and almost no design formulae are available yet for irregular waves. This paper gives such design formulae for practical use. Experimental modeling at three different scales (small, middle and large scale) has been carried out to measure such impacts. The tested geometry was a smooth sloping dike (only non-breaking waves) with a promenade at crest level and a storm wall at the end of this promenade. The outcome of this paper are three methodologies to a) calculate wave impact forces on such a storm wall as a function of the hydraulic parameters; b) determine the (Weibull) distribution of all impacts in one test, with the shape and scale parameters also linked to the hydraulic parameters; and c) to provide an indirect approach to calculate the impact forces on the storm wall. In this last approach, the (distribution of the) individual overtopping waves are linked to the (distribution of the) overtopping flow parameters, which are then linked to the (distribution of the) impact forces. Finally, the empirical formulae from the aforementioned three methodologies are compared; analogies and differences are discussed, and guidance is provided to design storm walls against post overtopping impact forces. Results show that forces from waves overtopping the dikes are in the order of 20 to 40 kN/m prototype scale in the dimensionless freeboard (Rc/Hm0) range of 1 to 2. This is (much) lower compared to impact forces on vertical walls as calculated by the Shore Protection Manual.
2017
experimental modeling; flow depth; flow velocity; force distribution; impact forces; post overtopping processes; scale effect; storm wall; weibull; environmental engineering; ocean engineering
01 Pubblicazione su rivista::01a Articolo in rivista
Impacts on a storm wall caused by non-breaking waves overtopping a smooth dike slope / Van Doorslaer, Koen; Romano, Alessandro; De Rouck, Julien; Kortenhaus, Andreas. - In: COASTAL ENGINEERING. - ISSN 0378-3839. - ELETTRONICO. - 120:(2017), pp. 93-111. [10.1016/j.coastaleng.2016.11.010]
File allegati a questo prodotto
File Dimensione Formato  
VanDoorslaer_Impacts-on-a-storm_2017.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 3.63 MB
Formato Adobe PDF
3.63 MB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/973599
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 38
  • ???jsp.display-item.citation.isi??? 28
social impact