Overtopping Formulas for Caisson Breakwaters with Nonbreaking 3D Waves

Franco, Claudio; Franco, Leopoldo

doi:10.1061/(asce)0733-950x(1999)125:2(98)

Cited by 66 publications

(30 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…All measured mean overtopping rates are well described by the deterministic approach given in EurOtop (2007) which expresses the upper boundary of the tested data sets. The approach by Franco (1999) fits very well to results of perpendicular wave attack of data set A at geometry 1. By means of exponential regression of the measured data sets four regression parameters a and b given in Table 1 can be derived to describe the correlation between dimensionless mean wave overtopping discharge Q and dimensionless freeboard R according to Eq.…”

Section: Hydraulic Model Test Resultsmentioning

confidence: 57%

“…The influence of the dyke geometry is less dominant for data set A than for data set B where the factor γ β decreases significantly for β > 30°. For an increasing angle β the influence factor γ β is decreasing disproportionately for data set A as previously outlined by Franco (1999) whereas it decreases unreasonably low for data set B as described by Goda (2009).…”

Section: Hydraulic Model Test Resultsmentioning

confidence: 58%

“…The approach followed in Eq. (6) (Franco, 1999) expresses the measurements of data set A for β < 37° and clearly overestimates data for larger wave attack angles. Instead, a disproportionately high decrease of γ β with increasing angle β up to 37° due to the cosine correlation is revealed.…”

Section: Hydraulic Model Test Resultsmentioning

confidence: 98%

“…Thus, the approach for non-impulsive conditions in front of vertical walls, given by where β depicts the angle of wave attack in relation to normal wave attack. A regression analysis of data sets provided by Franco (1999) for the preliminary prediction of the overtopping rate over a vertical wall breakwater in deep water under head-on, long-crested waves defines the mean wave overtopping volume Q by According to Goda (2009) the factor represents data of large scatter and has to be investigated for validity with many sets of further test data.…”

Section: Analysis Of Mean Overtopping Discharge: Conceptual Design Fomentioning

confidence: 99%

“…Van der Meer and Janssen (1995) investigated wave run-up and overtopping phenomena at dykes in irregular and short crested waves. Franco (1999) and Napp et al (2003) studied waves at vertical walls, while Goda (2009) improved the approach given in the EurOtop (2007) on the basis of data stemming from the CLASH project. Urbanized areas along the estuaries at the German North Sea coast are typically protected by sea walls with an additional vertical submerged toe structure.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Wave Overtopping at Dykes With Topped Vertical Wall - Impacts of Oblique Wave Attack

Kerpen

Schlurmann

2012

Int. Conf. Coastal. Eng.

View full text Add to dashboard Cite

Hydraulic model tests at a scale of 1:10 are carried out in a 40 m x 25 m wave basin with a state-of-the-art 3D wave generator in order to collect wave overtopping data at vertical walls and dykes with topped vertical walls. Wave conditions in the near field of the structures, velocities under waves and the mean overtopping discharge are measured. The experiments have been commissioned by the Lower Saxony Water Management, Coastal Defense and Nature Conservation Agency (NLWKN) with the purpose to deliver essential overtopping data for validation of numerical models. Two main geometries are analyzed -each for two specific wave spectra. Overtopping rates are investigated with respect to the remaining freeboard height Rc and the influence of oblique wave attack β{0°, 10°, 30°, 40°, 50°, 60°}. Results are compared with existing analytical approaches. As expected for this special geometrical coastal protection structure, it is examined that overtopping discharges increase with decreasing remaining freeboard. Intensity of the reduction is more dependent on the wave spectra than on the dyke geometry. Mean wave overtopping rate increases with decreasing relative water depth Hm0/d directly in front of the vertical wall. Furthermore, the mean wave overtopping rates decrease with an increasing angle of wave attack β. The correlation between mean wave overtopping rate and freeboard height is given in four newly adapted design formulas, describing the overtopping performance of the two discussed dyke geometries with topped vertical walls.

show abstract

Section: Hydraulic Model Test Resultsmentioning

confidence: 57%

Section: Hydraulic Model Test Resultsmentioning

confidence: 58%

Section: Hydraulic Model Test Resultsmentioning

confidence: 98%

Section: Analysis Of Mean Overtopping Discharge: Conceptual Design Fomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations