A Laboratory Study of Overtopping and Breaching of Shingle Barrier Beaches

Obhrai, Charlotte; Powell, Keith A.; Bradbury, Andrew P.

doi:10.1142/9789814277426_0124

Cited by 13 publications

(21 citation statements)

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“…Empirijski obrasci ravnotežnih profila [10-12] oslanjaju se samo na jedan ulazni podatak, promjer zrna plažnog materijala. Usporedba rezultata dobivenih takvih izraza sa stvarnimizmjerenim profilima šljunčanih plaža i podmorja u prirodi upućuje na veliku nepouzdanost primjene empirijskih formula [13][14][15], osim u slučaju izrazito homogenih okolišnih uvjeta i velikih troškova istražnih radova [16]. Osim toga, empirijski izrazi definiraju ravnotežni poprečni profil u eksponencijalnoj formi, što u praksi zasigurno ne predstavlja racionalan način izvedbe.…”

Section: Uvodunclassified

Analiza morfodinamičke stabilnosti poprečnog profila šljunčane plaže

2016

JCE

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Section: Uvodunclassified

Analiza morfodinamičke stabilnosti poprečnog profila šljunčane plaže

2016

JCE

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“…Consequently, they form a vital part of the U.K. flood defense infrastructure. Laboratory studies have shown that, similarly to embankments and seawalls, their structural vulnerability depends on the combination of wave height, period, and water level (Obhrai, Powell, & Bradbury, ); thus a multivariate representation is required if their fragility is to be accurately represented. As they are so widespread, any changes in the assessment of a structure's vulnerability by adopting new representations has the potential to not just alter regional flood risk estimates but also impact on national flood estimates.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Potential for Multivariate Fragility Representations to Alter Flood Risk Estimates

et al. 2018

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In flood risk analysis, limitations in the multivariate statistical models adopted to model the hydraulic load have restricted the probability of a defense suffering structural failure to be expressed conditionally on a single hydraulic loading variable. This is an issue at the coastal level where multiple loadings act on defenses with the exact combination of loadings dictating their failure probabilities. Recently, a methodology containing a multivariate statistical model with the flexibility to robustly capture the dependence structure between the individual loadings was used to derive extreme nearshore loading conditions. Its adoption will permit the incorporation of more precise representations of a structure's vulnerability in future analyses. In this article, a fragility representation of a shingle beach, where the failure probability is expressed over a three-dimensional loading parameter space-water level, wave height, and period-is derived at two localities. Within the approach, a Gaussian copula is used to capture any dependencies between the simplified geometric parameters of a beach's shape. Beach profiles are simulated from the copula and the failure probability, given the hydraulic load, determined by the reformulated Bradbury barrier inertia parameter model. At one site, substantial differences in the annual failure probability distribution are observed between the new and existing approaches. At the other, the beach only becomes vulnerable after a significant reduction of the crest height with its mean annual failure probability close to that presently predicted. It is concluded that further application of multivariate approaches is likely to yield more effective flood risk management.

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“…Investigations in small-scale physical models can be used to study coastal processes using well established scaling laws, but shortcomings due to scale effects remain and are not well understood (Van Rijn et al, 2011). Several small-scale experiments on overwash have been undertaken by: Hancock and Kobayashi, 1994;Obhrai et al (2008), Donnelly (2008), Kobayashi et al (2010), Park and Edge (2010), Figlus et al, (2011). Scaling problems can be overcome when a large-scale facility is used for quantifying physical processes that are almost impossible to measure in nature (Dette et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Measurements of morphodynamic and hydrodynamic overwash processes in a large-scale wave flume

Matias

Masselink

Castelle

et al. 2016

Coastal Engineering

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Overwash is an important process that controls short-term barrier dynamics, as well as long-term barrier migration, but this process is difficult to study in the field due to its rare occurrence and the challenging conditions under which it occurs. This paper uses data collected during BARDEX II experiment in the Delta Flume, the Netherlands, where a proto-type barrier was subjected to a range of wave and water level conditions. The objectives of this research are to: (1) compare the island 1) and the surf scaling parameter (ε, eq. 2).

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A Laboratory Study of Overtopping and Breaching of Shingle Barrier Beaches

Cited by 13 publications

References 1 publication

Analiza morfodinamičke stabilnosti poprečnog profila šljunčane plaže

Analiza morfodinamičke stabilnosti poprečnog profila šljunčane plaže

Exploring the Potential for Multivariate Fragility Representations to Alter Flood Risk Estimates

Measurements of morphodynamic and hydrodynamic overwash processes in a large-scale wave flume

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