Experimental Evidence of the Influence of Recurves on Wave Loads at Vertical Seawalls

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Dimitris Stagonas
  • Rajendran Ravindar
  • Venkatachalam Sriram
  • Stefan Schimmels

Organisationseinheiten

Externe Organisationen

  • Cranfield University
  • Indian Institute of Technology Madras (IITM)
  • Technische Universität Braunschweig
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer889
FachzeitschriftWater (Switzerland)
Jahrgang12
Ausgabenummer3
PublikationsstatusVeröffentlicht - 21 März 2020

Abstract

The role of recurves on top of seawalls in reducing overtopping has been previously shown but their influence in the distribution and magnitude of wave-induced pressures and forces on the seawall remains largely unexplored. This paper deals with the effects of different recurve geometries on the loads acting on the vertical wall. Three geometries with different arc lengths, or extremity angles (αe), were investigated in large-scale physical model tests with regular waves, resulting in a range of pulsating (non-breaking waves) to impulsive (breaking waves) conditions at the structure. As the waves hit the seawall, the up-rushing flow is deflected seawards by the recurve and eventually, re-enters the underlying water column and interacts with the next incoming wave. The re-entering water mass is, intuitively, expected to alter the incident waves but it was found that the recurve shape does not affect wave heights significantly. For purely pulsating conditions, the influence of αe on peak pressures and forces was also negligible. In marked contrast, the mean of the maximum impulsive pressure and force peaks increased, even by a factor of more than two, with the extremity angle. While there is no clear relation between the shape of the recurve and the mean peak pressures and forces, interestingly the mean of the 10% highest forces increases gradually with αe and this effect becomes more pronounced with increasing impact intensity.

ASJC Scopus Sachgebiete

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Experimental Evidence of the Influence of Recurves on Wave Loads at Vertical Seawalls. / Stagonas, Dimitris; Ravindar, Rajendran; Sriram, Venkatachalam et al.
in: Water (Switzerland), Jahrgang 12, Nr. 3, 889, 21.03.2020.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Stagonas D, Ravindar R, Sriram V, Schimmels S. Experimental Evidence of the Influence of Recurves on Wave Loads at Vertical Seawalls. Water (Switzerland). 2020 Mär 21;12(3):889. doi: 10.3390/w12030889
Stagonas, Dimitris ; Ravindar, Rajendran ; Sriram, Venkatachalam et al. / Experimental Evidence of the Influence of Recurves on Wave Loads at Vertical Seawalls. in: Water (Switzerland). 2020 ; Jahrgang 12, Nr. 3.
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abstract = "The role of recurves on top of seawalls in reducing overtopping has been previously shown but their influence in the distribution and magnitude of wave-induced pressures and forces on the seawall remains largely unexplored. This paper deals with the effects of different recurve geometries on the loads acting on the vertical wall. Three geometries with different arc lengths, or extremity angles (αe), were investigated in large-scale physical model tests with regular waves, resulting in a range of pulsating (non-breaking waves) to impulsive (breaking waves) conditions at the structure. As the waves hit the seawall, the up-rushing flow is deflected seawards by the recurve and eventually, re-enters the underlying water column and interacts with the next incoming wave. The re-entering water mass is, intuitively, expected to alter the incident waves but it was found that the recurve shape does not affect wave heights significantly. For purely pulsating conditions, the influence of αe on peak pressures and forces was also negligible. In marked contrast, the mean of the maximum impulsive pressure and force peaks increased, even by a factor of more than two, with the extremity angle. While there is no clear relation between the shape of the recurve and the mean peak pressures and forces, interestingly the mean of the 10% highest forces increases gradually with αe and this effect becomes more pronounced with increasing impact intensity.",
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AU - Stagonas, Dimitris

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AU - Sriram, Venkatachalam

AU - Schimmels, Stefan

N1 - Funding Information: This work has been carried out in the scope of project ‘Large-scale measurements of wave loads and mapping of impact pressure distribution at the underside of parapets (HyIV-FZK-06)’ under the funding of HYDRALAB IV, contract number 261520. The authors would like to thank the whole team at GWK for the hospitality, technical and scientific support.

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