Details
| Original language | English |
|---|---|
| Article number | 889 |
| Journal | Water (Switzerland) |
| Volume | 12 |
| Issue number | 3 |
| Publication status | Published - 21 Mar 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.
Keywords
- Pulsating and impulsive conditions, Recurve geometry, Recurves, Vertical seawalls, Wave loads and pressures
ASJC Scopus subject areas
- Social Sciences(all)
- Geography, Planning and Development
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Agricultural and Biological Sciences(all)
- Aquatic Science
- Environmental Science(all)
- Water Science and Technology
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In: Water (Switzerland), Vol. 12, No. 3, 889, 21.03.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Experimental Evidence of the Influence of Recurves on Wave Loads at Vertical Seawalls
AU - Stagonas, Dimitris
AU - Ravindar, Rajendran
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.
PY - 2020/3/21
Y1 - 2020/3/21
N2 - 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.
AB - 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.
KW - Pulsating and impulsive conditions
KW - Recurve geometry
KW - Recurves
KW - Vertical seawalls
KW - Wave loads and pressures
UR - http://www.scopus.com/inward/record.url?scp=85082659772&partnerID=8YFLogxK
U2 - 10.3390/w12030889
DO - 10.3390/w12030889
M3 - Article
AN - SCOPUS:85082659772
VL - 12
JO - Water (Switzerland)
JF - Water (Switzerland)
SN - 2073-4441
IS - 3
M1 - 889
ER -