Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 112024 |
| Fachzeitschrift | Ocean engineering |
| Jahrgang | 261 |
| Frühes Online-Datum | 12 Aug. 2022 |
| Publikationsstatus | Veröffentlicht - 1 Okt. 2022 |
Abstract
This work presents the results of an investigation on how wave overtopping at a near-vertical seawall at the back of a sandy foreshore is influenced by sequences of erosive storms. The experiments were carried out in the Large Wave Flume (GWK) at Leibniz University, Hannover (Germany). The tested layout consisted of a near-vertical 10/1 seawall and a sandy foreshore with an initial 1/15 slope. Three sequences of idealised erosive storms were simulated. Within each storm both the incident wave conditions and still water level were varied in time to represent high and low tide conditions. Each sequence started from a 1/15 configuration and the beach was not restored in between storms. The measurements included waves, beach profile, wave overtopping volumes. The profile of the beach was measured after each sea state tested. Wave overtopping at each stage of the tested storms was significantly influenced by bed changes. This was linked to the measured evolution of the beach. Measurements showed that a barred profile developed quickly at the start of each sequence, and scour developed at the toe of the structure during high water level conditions, while accretion or partial backfilling developed during low water level conditions. Due to these processes, the position of a sea state in the tested sequence is shown to be an important factor in determining the wave overtopping volume. Remarkably, when a weaker idealised storm followed a more energetic one, nearly the same level of overtopping was recorded. This is explained by the foreshore erosion, leading to increased water depths and wave heights at the toe of the structure. This finding allows to quantify and to explain the variability of wave overtopping in storms following one another at intervals shorter than the recovery time of the foreshore.
ASJC Scopus Sachgebiete
- Umweltwissenschaften (insg.)
- Environmental engineering
- Ingenieurwesen (insg.)
- Meerestechnik
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in: Ocean engineering, Jahrgang 261, 112024, 01.10.2022.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Wave overtopping at near-vertical seawalls
T2 - Influence of foreshore evolution during storms
AU - Briganti, Riccardo
AU - Musumeci, Rosaria Ester
AU - van der Meer, Jentsje
AU - Romano, Alessandro
AU - Stancanelli, Laura Maria
AU - Kudella, Matthias
AU - Akbar, Rizki
AU - Mukhdiar, Ryard
AU - Altomare, Corrado
AU - Suzuki, Tomohiro
AU - De Girolamo, Paolo
AU - Besio, Giovanni
AU - Dodd, Nicholas
AU - Zhu, Fangfang
AU - Schimmels, Stefan
N1 - Funding Information: The work was supported by the European Union Horizon 2020 Research and Innovation Programme through the grant to HYDRALAB-PLUS, Contract no. 654110 . We are grateful to all the staff in GWK for the hard work that made the experiments and analysis possible.
PY - 2022/10/1
Y1 - 2022/10/1
N2 - This work presents the results of an investigation on how wave overtopping at a near-vertical seawall at the back of a sandy foreshore is influenced by sequences of erosive storms. The experiments were carried out in the Large Wave Flume (GWK) at Leibniz University, Hannover (Germany). The tested layout consisted of a near-vertical 10/1 seawall and a sandy foreshore with an initial 1/15 slope. Three sequences of idealised erosive storms were simulated. Within each storm both the incident wave conditions and still water level were varied in time to represent high and low tide conditions. Each sequence started from a 1/15 configuration and the beach was not restored in between storms. The measurements included waves, beach profile, wave overtopping volumes. The profile of the beach was measured after each sea state tested. Wave overtopping at each stage of the tested storms was significantly influenced by bed changes. This was linked to the measured evolution of the beach. Measurements showed that a barred profile developed quickly at the start of each sequence, and scour developed at the toe of the structure during high water level conditions, while accretion or partial backfilling developed during low water level conditions. Due to these processes, the position of a sea state in the tested sequence is shown to be an important factor in determining the wave overtopping volume. Remarkably, when a weaker idealised storm followed a more energetic one, nearly the same level of overtopping was recorded. This is explained by the foreshore erosion, leading to increased water depths and wave heights at the toe of the structure. This finding allows to quantify and to explain the variability of wave overtopping in storms following one another at intervals shorter than the recovery time of the foreshore.
AB - This work presents the results of an investigation on how wave overtopping at a near-vertical seawall at the back of a sandy foreshore is influenced by sequences of erosive storms. The experiments were carried out in the Large Wave Flume (GWK) at Leibniz University, Hannover (Germany). The tested layout consisted of a near-vertical 10/1 seawall and a sandy foreshore with an initial 1/15 slope. Three sequences of idealised erosive storms were simulated. Within each storm both the incident wave conditions and still water level were varied in time to represent high and low tide conditions. Each sequence started from a 1/15 configuration and the beach was not restored in between storms. The measurements included waves, beach profile, wave overtopping volumes. The profile of the beach was measured after each sea state tested. Wave overtopping at each stage of the tested storms was significantly influenced by bed changes. This was linked to the measured evolution of the beach. Measurements showed that a barred profile developed quickly at the start of each sequence, and scour developed at the toe of the structure during high water level conditions, while accretion or partial backfilling developed during low water level conditions. Due to these processes, the position of a sea state in the tested sequence is shown to be an important factor in determining the wave overtopping volume. Remarkably, when a weaker idealised storm followed a more energetic one, nearly the same level of overtopping was recorded. This is explained by the foreshore erosion, leading to increased water depths and wave heights at the toe of the structure. This finding allows to quantify and to explain the variability of wave overtopping in storms following one another at intervals shorter than the recovery time of the foreshore.
KW - Beach foreshore
KW - Coastal flooding
KW - Coastal structures
KW - Seawall
KW - Storm sequences
KW - Wave overtopping
UR - http://www.scopus.com/inward/record.url?scp=85135797637&partnerID=8YFLogxK
U2 - 10.1016/j.oceaneng.2022.112024
DO - 10.1016/j.oceaneng.2022.112024
M3 - Article
AN - SCOPUS:85135797637
VL - 261
JO - Ocean engineering
JF - Ocean engineering
SN - 0029-8018
M1 - 112024
ER -