Enhancing climate resilience of vertical seawall with retrofitting - A physical modelling study

Dong, Shudi; Abolfathi, Soroush; Salauddin,; Tan, Zhiying; Pearson, Jonathan

doi:10.1016/j.apor.2020.102331

Cited by 39 publications

(31 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As originally proposed by Franco et al (1994) and Van der Meer and Janssen (1995), and later confirmed in physical and numerical investigations of wave overtopping (see for example, ; Hughes et al (2012); Zanuttigh et al (2013); Abolfathi et al (2018); Salauddin and Pearson (2018); Dong et al (2018Dong et al ( , 2020; Pearson (2019a, 2020)), the distribution of individual overtopping volumes at conventional sea defences follow a two-parameter Weibull distribution function, as follows:…”

Section: Introductionmentioning

confidence: 70%

“…In a sequence of overtopping events, coastal engineers and practitioners are generally interested in the largest wave by wave overtopping volumes. Consequently, the Weibull shape parameter, b, is usually calculated from the gradient of the extreme tail of the Weibull distribution where only the largest volumes reside on the Weibull scale (see for example, Pearson et al, (2002); Dong et al, (2018Dong et al, ( , 2020; Pearson (2018, 2020)). In Fig.…”

Section: Weibull Plots Of Wave-by-wave Overtopping Volumesmentioning

confidence: 99%

See 1 more Smart Citation

Distribution of Individual Wave Overtopping Volumes on a Sloping Structure With a Permeable Foreshore

Salauddin¹,

Abolfathi²,

Dong³

et al. 2020

Int. Conf. Coastal. Eng.

View full text Add to dashboard Cite

Maximum wave overtopping volumes on sea defences are an indicator for identifying risks to people and properties from wave hazards. The probability distribution of individual overtopping volumes can generally be described by a two-parameter Weibull distribution function (shape and scale parameters). Therefore, the reliable prediction of maximum individual wave overtopping volumes at coastal structures relies on an accurate estimation of the shape factor in the Weibull distribution. This study contributes to an improved understanding of the distribution of individual wave overtopping volumes at sloping structures by analysing the wave-by-wave overtopping volumes obtained from physical model experiments on a 1V:2H sloped impermeable structure with a permeable shingle foreshore of slope 1V:20H. Measurements of the permeable shingle foreshore were benchmarked against those from an identical experimental set-up with a smooth impermeable foreshore (1V:20H) of the same geometry. Results from both experimental set-ups were compared to commonly used empirical formulations, underpinned by the assumption that an impermeable foreshore exists in front of the sea structure. The effect on the shape factor in the Weibull distribution of incident wave steepness, relative crest freeboard, probability of overtopping waves and discharge are examined to determine the variation of individual overtopping volumes with respect to these key parameters. A key finding from the study is that no major differences in Weibull distribution shape parameter were observed for the tested impermeable and permeable sloped foreshores. Existing empirical formulae were also shown to predict reasonably well the Weibull distribution shape parameter, b, at sloping structures with both impermeable and permeable slopes.

show abstract

Section: Introductionmentioning

confidence: 70%

Section: Weibull Plots Of Wave-by-wave Overtopping Volumesmentioning

confidence: 99%

Distribution of Individual Wave Overtopping Volumes on a Sloping Structure With a Permeable Foreshore

Salauddin¹,

Abolfathi²,

Dong³

et al. 2020

Int. Conf. Coastal. Eng.

View full text Add to dashboard Cite

show abstract

“…Over the years, many physical and numerical modelling research has been carried out to investigate the wavestructure interactions and the resulting mean overtopping characteristics at sea defences (e.g., Franco et al, 1994;Van der Meer and Bruce, 2014;Abolfathi et al, 2016 andDong et al, 2018 and2020;Yeganeh-Bakhtiari et al, 2017 and2020;Fitri et al, 2019;Pearson, 2019 and2020). The most reliable empirical predication formulae for prediction of mean overtopping rates have been reported in the overtopping manual, EurOtop (2018).…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Wave-by-Wave Overtopping at Vertical Seawalls

Dong¹,

Abolfathi²,

Salauddin³

et al. 2020

Int. Conf. Coastal. Eng.

View full text Add to dashboard Cite

Over the years, many physical and numerical modelling research has been carried out to investigate the wave-structure interactions and the resulting mean overtopping characteristics at sea defences. The most reliable empirical predication formulae for prediction of mean overtopping rates have been reported in the overtopping manual, EurOtop (2018). In addition to average overtopping rates, in recent years, the spatial distribution of overtopped water has become an important topic of research to understand the safe zone behind coastal defences. The existing empirical formulae for spatial distribution of overtopping provide conservative predictions, as it has been derived from the mean overtopping volumes. The extreme wave overtopping hazards in generally originate from individual overtopping events rather than the mean overtopping volumes. This study presents comprehensive laboratory investigations on the spatial distribution of wave-by-wave overtopping at vertical seawalls.

show abstract

“…In general, the incident wave heights in relatively deep waters follow the Rayleigh distribution whereas in nearshore regions, the distribution of incident wave heights deviates from the Rayleigh distribution (Battjes and Groenendijk, 2000;Goda, 2009;EurOtop, 2018;Dong et al, 2020b). The Rayleigh distribution of wave heights can be expressed as:…”

Section: Incident Wave Heightsmentioning

confidence: 99%

Eco-Engineering of Seawalls—An Opportunity for Enhanced Climate Resilience From Increased Topographic Complexity

et al. 2021

View full text Add to dashboard Cite

In the context of “green” approaches to coastal engineering, the term “eco-engineering” has emerged in recent years to describe the incorporation of ecological concepts (including artificially water-filled depressions and surface textured tiles on seawalls and drilled holes in sea structures) into the conventional design process for marine infrastructures. Limited studies have evaluated the potential increase in wave energy dissipation resulting from the increased hydraulic roughness of ecologically modified sea defences which could reduce wave overtopping and consequent coastal flood risks, while increasing biodiversity. This paper presents results of small-scale laboratory investigations of wave overtopping on artificially roughened seawalls. Impulsive and non-impulsive wave conditions with two deep-water wave steepness values (=0.015 and 0.06) are evaluated to simulate both swell and storm conditions in a two-dimensional wave flume with an impermeable 1:20 foreshore slope. Measurements from a plain vertical seawall are taken as the reference case. The seawall was subsequently modified to include 10 further test configurations where hydraulic effects, reflective of “eco-engineering” interventions, were simulated by progressively increasing seawall roughness with surface protrusions across three length scales and three surface densities. Measurements at the plain vertical seawall compared favorably to empirical predictions from the EurOtop II Design Manual and served as a validation of the experimental approach. Results from physical model experiments showed that increasing the length and/or density of surface protrusions reduced overtopping on seawalls. Benchmarking of test results from experiments with modified seawalls to reference conditions showed that the mean overtopping rate was reduced by up to 100% (test case where protrusion density and length were maximum) under impulsive wave conditions. Results of this study highlight the potential for eco-engineering interventions on seawalls to mitigate extreme wave overtopping hazards by dissipating additional wave energy through increased surface roughness on the structure.

show abstract

Enhancing climate resilience of vertical seawall with retrofitting - A physical modelling study

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 39 publications

References 48 publications

Distribution of Individual Wave Overtopping Volumes on a Sloping Structure With a Permeable Foreshore

Distribution of Individual Wave Overtopping Volumes on a Sloping Structure With a Permeable Foreshore

Spatial Distribution of Wave-by-Wave Overtopping at Vertical Seawalls

Eco-Engineering of Seawalls—An Opportunity for Enhanced Climate Resilience From Increased Topographic Complexity

Contact Info

Product

Resources

About