Assessment of hydrodynamic competence in extreme marine events through application of Boussinesq–Green–Naghdi models

Zhang, Yao; Kennedy, Andrew; Tomiczek, Tori; Yang, Weixuan; Liu, Weijie; Westerink, Joannes J.

doi:10.1016/j.apor.2017.06.001

Cited by 11 publications

(3 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The coefficients can only be approximate, because it is not possible to better constrain them. Despite recent advances in modelling (e.g., Weiss and Diplas, 2015;Zainali and Weiss, 2015;Zhang et al, 2017), the dynamics of high-energy coasts still are so poorly known that rough guesses are the best we can do. But coupled with reliable hydrodynamic estimates of the velocity required to move a boulder, this approach permits evaluation of wave conditions needed for transport.…”

Section: Massmentioning

confidence: 99%

Maximal Heights of Nearshore Storm Waves and Resultant Onshore Flow Velocities

Bujan

Cox

2020

Front. Mar. Sci.

View full text Add to dashboard Cite

Storm waves, after breaking or overtopping, generate strong onshore flows that do significant mechanical work, including eroding and transporting large boulders. The waves can be amplified on approach, and the flows themselves may be further intensified by local topographic effects. These processes are currently poorly parameterised, but are of great importance for understanding the interactions between waves and coasts. We present a highly generalised equation for estimating maximal coastal wave heights and consequent onshore flow velocities. Although very approximate, this method contains no embedded assumptions, and thus provides a more realistic first-order check of storm wave capabilities than previous approaches. Initial analysis suggests that exceptional wave impacts may generate onshore flow velocities up to six times greater than expected from previous approaches. Although the probability of occurrence in any given storm is very low, the possibility of such extreme values cannot be ignored, especially when interpreting ancient deposits of large boulders. The equations presented here can be used as a first-order test for coastal boulder deposits currently interpreted as tsunami deposits, to evaluate whether a storm-wave origin should be reconsidered. This approach could also be employed at coasts in general, to evaluate long-term probabilities of damaging flows, as a component of coastal risk analysis.

show abstract

Section: Massmentioning

confidence: 99%

Maximal Heights of Nearshore Storm Waves and Resultant Onshore Flow Velocities

Bujan

Cox

2020

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…Building footprint polygons are from the City of Biloxi, City of Gulfport, The WF Damage Scale categorizes global combined wind and flood residential building damage into seven damage classes ranked WF0 through WF6. The WF Damage Scale has been previously adopted by Massarra et al (2019) and modified and applied by Hatzikyriakou (2017), Tomiczek et al (2017), and Zhang et al (2017) to classify building damage data obtained from field reconnaissance. A database that includes land parcel data and building footprint polygons was developed using a geographic information systems (ArcGIS).…”

Section: Global Building Damage State and Building Attributes Variablesmentioning

confidence: 99%

Multihazard Hurricane Fragility Model for Wood Structure Homes Considering Hazard Parameters and Building Attributes Interaction

Massarra

Friedland

Marx

et al. 2020

Front. Built Environ.

View full text Add to dashboard Cite

Predicting building damage as a function of hurricane hazards, building attributes, and the interaction between hazard and building attributes is a key to understanding how significant interaction reflects variation hazard intensity effect on damage based on building attribute levels. This paper develops multihazard hurricane fragility models for wood structure homes considering interaction between hazard and building attributes. Fragility models are developed for ordered categorical damage states (DS) and binary collapse/no collapse. Exterior physical damage and building attributes from rapid assessment in coastal Mississippi following Hurricane Katrina (2005), high-resolution numerical hindcast hazard intensities from the Simulating WAves Nearshore and ADvanced CIRCulation (SWAN+ADCIRC) models, and base flood elevation values are used as model input. Leave-one-out cross-validation (LOOCV) is used to evaluate model prediction accuracy. Eleven and forty-nine combinations of global damage response variables and main explanatory variables, respectively, were investigated and evaluated. Of these models, one DS and one collapse model met the rejection criteria. These models were refitted considering interaction terms. Maximum 3-s gust wind speed and maximum significant wave height were found to be factors that significantly affect damage. The interaction between maximum significant wave height and number of stories was the significant interaction term for the DS and collapse models. For every 0.3 m (0.98 ft) increase in maximum significant wave height, the estimated odds of being in a higher rather than in a lower damage state for DS model were found to be 1.95 times greater for one-rather than for two-story buildings. For every 0.3 m (0.98 ft) increase in maximum significant wave height, the estimated odds of collapse were found to be 2.23 times greater for one-rather than for two-story buildings. Model prediction accuracy was 84% and 91% for DS and collapse models, respectively. This paper does not consider the full hazard intensity experienced in Hurricane Katrina; rather, it focuses on single-family homes in a defined study area subjected to wind, wave, and storm surge hazards. Thus, the findings of this paper are not applicable for events with hazards that exceed those experienced in the study area, from which the models were derived.

show abstract

“…To include these effects for the estimation of a wave size, a forward model of boulder transport should be used. These models compute the inundation together with the boulder motion [Imamura et al, 2008;Nandasena and Tanaka, 2013;Zainali and Weiss, 2015;Kennedy et al, 2016;Zhang et al, 2017].…”

Section: Introductionmentioning

confidence: 99%

Derivation, Validation, and Numerical Implementation of a Two-Dimensional Boulder Transport Formulation by Coastal Waves

Watanabe

Yoshii

Roeber

et al. 2022

J. Earthquake and Tsunami

View full text Add to dashboard Cite

Numerical computations for boulder transport have become a state-of-the-art tool for hindcasting the hydraulic processes associated with past storm wave and tsunami events. Since most previously developed two-dimensional formulations cater to boulders with symmetric outlines, they can consequently reproduce the transport distance and the velocity of boulders of cubic shape or similar structured geometries reasonably well. However, the formulations exhibit limitations when applied to rectangular- and flat-shaped boulders. The presently available formulations have difficulties reproducing the variations of frictional drag force due to the changes of the boulders’ contact time with the ground. We have developed an extended boulder transport formulation and derived a new empirical roughness coefficient by considering the shape of boulders that accounts for the changes of the boulders’ contact time with the ground. In comparison to other existing transport formulations, the present method provides superior accuracy of block velocity and transport distance in most cases — especially for boulders of rectangular geometry. Even by neglecting the full three-dimensional processes, numerical computations extended with the proposed boulder transport formulation can help explaining historic wave regimes, which were responsible for the transport of a variety of coastal boulders reported around the world.

show abstract

Assessment of hydrodynamic competence in extreme marine events through application of Boussinesq–Green–Naghdi models

Cited by 11 publications

References 52 publications

Maximal Heights of Nearshore Storm Waves and Resultant Onshore Flow Velocities

Maximal Heights of Nearshore Storm Waves and Resultant Onshore Flow Velocities

Multihazard Hurricane Fragility Model for Wood Structure Homes Considering Hazard Parameters and Building Attributes Interaction

Derivation, Validation, and Numerical Implementation of a Two-Dimensional Boulder Transport Formulation by Coastal Waves

Contact Info

Product

Resources

About