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Full-scale experimental study on wave overtopping at stepped revetments
https://orcid.org/0000-0002-3513-4207
https://orcid.org/0000-0003-4112-490X
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 γf 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.
Highlights Based on full-scale wave flume tests, average and individual wave overtopping at stepped revetments have been studied. Previous small-scale studies significantly underestimate the influence factor for roughness of the tested stepped revetments. A new formula is proposed for the influence factor for roughness of stepped revetments to be applied in EurOtop (2018). The individual overtopping events were described by a Weibull distribution and maximum overtopping volumes were determined. A higher median shape factor (b=1.63) was found for stepped revetments compared to other structure types.
Full-scale experimental study on wave overtopping at stepped revetments
https://orcid.org/0000-0002-3513-4207
https://orcid.org/0000-0003-4112-490X
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 γf 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.
Highlights Based on full-scale wave flume tests, average and individual wave overtopping at stepped revetments have been studied. Previous small-scale studies significantly underestimate the influence factor for roughness of the tested stepped revetments. A new formula is proposed for the influence factor for roughness of stepped revetments to be applied in EurOtop (2018). The individual overtopping events were described by a Weibull distribution and maximum overtopping volumes were determined. A higher median shape factor (b=1.63) was found for stepped revetments compared to other structure types.
Full-scale experimental study on wave overtopping at stepped revetments
https://orcid.org/0000-0002-3513-4207
https://orcid.org/0000-0003-4112-490X
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 γf 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.
Highlights Based on full-scale wave flume tests, average and individual wave overtopping at stepped revetments have been studied. Previous small-scale studies significantly underestimate the influence factor for roughness of the tested stepped revetments. A new formula is proposed for the influence factor for roughness of stepped revetments to be applied in EurOtop (2018). The individual overtopping events were described by a Weibull distribution and maximum overtopping volumes were determined. A higher median shape factor (b=1.63) was found for stepped revetments compared to other structure types.
Full-scale experimental study on wave overtopping at stepped revetments
Schoonees, Talia (author) / Kerpen, Nils B. (author) / Schlurmann, Torsten (author)
Coastal Engineering ; 167
2021-03-13
Article (Journal)
Electronic Resource
English
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