Sensitivity and Uncertainty Analysis of Coastal Numerical Model Under Various Beach Conditions in Korea

Cho, Minsang; Yoon, Hyun‐Doug; Yang, Jaesung; Son, Sangyoung

doi:10.1142/9789811204487_0043

Cited by 3 publications

(3 citation statements)

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“…The model was also sensitive to wetslope, and increasing this parameter reduced the erosion, particularly in the dune toe [Figs. 5(b and c) and 6(b and c)], as was also observed by previous studies (Armaroli et al 2013;Cho et al 2019;Vousdoukas et al 2012b). This was especially observed when bermslope was off.…”

Section: D Modelsupporting

confidence: 87%

“…Moreover, they suggested that bermslope could minimize the importance of other slope parameters implemented in the model, such as "wetslope," which establishes the critical bed-slope of the wet profile before the initiation of avalanching. Cho et al (2019) declared that XBeach is more sensitive to changes in wetslope values in a steep profile than in a mild profile, and, hence, the selection of this parameter should be carefully considered in these beaches.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Coastal Erosion in Exposed and Groin-Protected Steep Beaches

Garzon

Ferreira

Plomaritis

2022

J. Waterway, Port, Coastal, Ocean Eng.

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Process-based models are suitable tools for reproducing storm-driven erosion. However, their performance has been mainly examined on mild-slope sandy beaches and their use on steep beaches still represents a challenge. Here, open-source process-based model XBeach experiments were combined with topographical measurements collected for two storms (16-and 5-year return period) to obtain a reliable model. The model parameters "facua" (parameterized wave asymmetry and skewness sediment transport component), "bermslope" (upslope transport term for semireflective beaches), and "wetslope" (critical avalanching submerged slope) were utilized for calibration and validation. The 16-year storm simulations on an exposed beach revealed that whether bermslope increased and "facua" must be reduced, and vice versa, to properly simulate erosion. Adding bermslope provided excellent results for these storms when using facua and wetslope values close to the recommended values. In a groin-protected site, XBeach was successfully calibrated and validated for the tested storms using these parameters, although with different values. These experiments demonstrated that the appropriate use of these parameters can satisfactorily simulate morphological changes on steep beaches for different hydrodynamic conditions and coastal settings (exposed and groin protected).

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Section: D Modelsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Modeling of Coastal Erosion in Exposed and Groin-Protected Steep Beaches

Garzon

Ferreira

Plomaritis

2022

J. Waterway, Port, Coastal, Ocean Eng.

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show abstract

“…Here the option considering wave refraction (multi_dir) was implemented. The model was calibrated by using variations in three model parameters: facua (parameterized wave asymmetry and skewness sediment transport component), bermslope (upslope transport term for semi-reflective beaches), and wetslope (critical avalanching submerged slope) because they have been found to largely impact the erosion of the steep profiles similar to those assessed here (Cho et al, 2019;J. L. Garzon et al, 2022aJ.…”

Section: Numerical Model Framework Validationmentioning

confidence: 99%

Uncertainty Analysis Related to Beach Morphology and Storm Duration for More Reliable Early Warning Systems for Coastal Hazards

2023

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Early warning systems (EWSs) for coastal erosion are cost‐effective instruments for risk reduction. Among other aspects, the selection of the pre‐storm beach morphology and the definition of storm characteristics can affect EWS reliability. Here, XBeach simulations were used to assess the uncertainties in beach‐dune erosion related to the variability of storm severity and duration and pre‐storm morphology. Wave height return periods (from 5 to 50 years) determined the severity and the duration variability was established from confidence intervals after an adjustment with wave height. The variability of steep profiles included different berm morphologies (from fully developed to eroded berms). Three indicators, relative eroded volume, proportional berm retreat and proportional dune retreat, were evaluated. The experiments revealed that: (a) Relative eroded volume uncertainties related to the pre‐storm morphology variability were slightly lower (maximum 8%) than the uncertainties related to storm duration (11%–18%). (b) Pre‐storm profile variability can induce large uncertainties in the proportional berm retreat (up to 88%) for moderate events such as the 5‐ and 10‐year events. Storm duration variability had less influence on this indicator (maximum 12%). (c) The uncertainties in the proportional dune retreat increased with storm severity and they ranged between 14% and 41% for pre‐storm profile variability and between 2% and 40% for storm duration variability. Duration variability even governed the occurrence of dune breaching on eroded berm profiles in the most extreme event. Hence, the uncertainties related to initial/forcing conditions, namely pre‐storm morphology and storm duration, must be assessed to develop reliable coastal erosion EWSs.

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Modeling cross-shore profile evolution in response to climate change: A case study for the Southwestern Black Sea Coast

Güner,

Başaran

2024

Regional Studies in Marine Science

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Sensitivity and Uncertainty Analysis of Coastal Numerical Model Under Various Beach Conditions in Korea

Cited by 3 publications

References 0 publications

Modeling of Coastal Erosion in Exposed and Groin-Protected Steep Beaches

Modeling of Coastal Erosion in Exposed and Groin-Protected Steep Beaches

Uncertainty Analysis Related to Beach Morphology and Storm Duration for More Reliable Early Warning Systems for Coastal Hazards

Modeling cross-shore profile evolution in response to climate change: A case study for the Southwestern Black Sea Coast

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