Details
| Original language | English |
|---|---|
| Article number | 103887 |
| Journal | Coastal engineering |
| Volume | 167 |
| Early online date | 28 Mar 2021 |
| Publication status | Published - Aug 2021 |
Abstract
Stepped revetments limit wave overtopping effectively. Small-scale studies provided insights in the design of crest-levels and step geometries of these structures. The validation of these insights at large scale, along with the analysis of individual overtopping volumes, is required to formulate design recommendations. This paper investigates wave overtopping rates and individual overtopping volumes at stepped revetments by means of full-scale flume experiments. Two cross-sections, each with a slope of 1:3, were studied with uniform step heights of 0.17 m and 0.50 m. The revetments reduced wave overtopping rates in comparison to smooth dikes, resulting in influence factors for roughness (γ f) between 0.43 and 0.73. An empirical formula for γ f is proposed with which the wave overtopping rate at stepped revetments can be estimated. Previous small-scale studies underestimate γ f of this study by 2–31 %. Individual overtopping volumes were described by a Weibull distribution, revealing a higher median shape factor (b=1.63) for stepped revetments compared to breakwaters, smooth dikes or vertical walls.
Keywords
- Coastal structures, Large scale, Physical model tests, Roughness factor, Stepped revetments, Wave overtopping
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Engineering(all)
- Ocean Engineering
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In: Coastal engineering, Vol. 167, 103887, 08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Full-scale experimental study on wave overtopping at stepped revetments
AU - Schoonees, Talia
AU - Kerpen, Nils B.
AU - Schlurmann, Torsten
N1 - Funding Information: The study was conducted within the framework of the research project waveSTEPS (03KIS118). We gratefully acknowledge the German Federal Ministry of Education and Research (BMBF) and the German Coastal Engineering Research Council (KFKI) for funding this research. We wish to thank Matthias Kudella and the technical team at FZK for the model construction, operational support and advice.
PY - 2021/8
Y1 - 2021/8
N2 - Stepped revetments limit wave overtopping effectively. Small-scale studies provided insights in the design of crest-levels and step geometries of these structures. The validation of these insights at large scale, along with the analysis of individual overtopping volumes, is required to formulate design recommendations. This paper investigates wave overtopping rates and individual overtopping volumes at stepped revetments by means of full-scale flume experiments. Two cross-sections, each with a slope of 1:3, were studied with uniform step heights of 0.17 m and 0.50 m. The revetments reduced wave overtopping rates in comparison to smooth dikes, resulting in influence factors for roughness (γ f) between 0.43 and 0.73. An empirical formula for γ f is proposed with which the wave overtopping rate at stepped revetments can be estimated. Previous small-scale studies underestimate γ f of this study by 2–31 %. Individual overtopping volumes were described by a Weibull distribution, revealing a higher median shape factor (b=1.63) for stepped revetments compared to breakwaters, smooth dikes or vertical walls.
AB - Stepped revetments limit wave overtopping effectively. Small-scale studies provided insights in the design of crest-levels and step geometries of these structures. The validation of these insights at large scale, along with the analysis of individual overtopping volumes, is required to formulate design recommendations. This paper investigates wave overtopping rates and individual overtopping volumes at stepped revetments by means of full-scale flume experiments. Two cross-sections, each with a slope of 1:3, were studied with uniform step heights of 0.17 m and 0.50 m. The revetments reduced wave overtopping rates in comparison to smooth dikes, resulting in influence factors for roughness (γ f) between 0.43 and 0.73. An empirical formula for γ f is proposed with which the wave overtopping rate at stepped revetments can be estimated. Previous small-scale studies underestimate γ f of this study by 2–31 %. Individual overtopping volumes were described by a Weibull distribution, revealing a higher median shape factor (b=1.63) for stepped revetments compared to breakwaters, smooth dikes or vertical walls.
KW - Coastal structures
KW - Large scale
KW - Physical model tests
KW - Roughness factor
KW - Stepped revetments
KW - Wave overtopping
UR - http://www.scopus.com/inward/record.url?scp=85104595008&partnerID=8YFLogxK
U2 - 10.1016/j.coastaleng.2021.103887
DO - 10.1016/j.coastaleng.2021.103887
M3 - Article
VL - 167
JO - Coastal engineering
JF - Coastal engineering
SN - 0378-3839
M1 - 103887
ER -