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http://dx.doi.org/10.9765/KSCOE.2019.31.6.493

Sensitivity Analysis of Sediment Transport Scaling Factors on Cross-Shore Beach Profile Changes using Deflt3D  

Yang, Jung-A (Research Institute for Mega Construction, Korea University)
Son, Sangyoung (School of Civil, Environment & Architectural Engineering, Korea University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.31, no.6, 2019 , pp. 493-500 More about this Journal
Abstract
In this study, sensitivity analysis of sediment transport scaling factors in Delft3D-Morphology was performed to examine the effect those parameters on simulation results of cross-shore profile changes. For numerical experiments, one-year wave time series data which were observed in 2018 on the Maengbang coast in Gangwon prefecture were applied as external force. Bathymetric data observed in January and October of the same year were used as initial bathymetric data and annual bathymetric change data, respectively. The simulation performance of the model was evaluated based on the Brier Skill Score index for each part by dividing an arbitrary cross section within the calculation domain into the onshore and offshore parts. As a result, it was found thet the fBED variable has a slight effect on the simulation results. The fBEDW and fSUSW variables show good simulation performance in onshore part when the value less than 0.5 is applied and vice versa. Among the experimental conditions, the optimal combinations of variables are fBED = 1.0, fBEDW = 1.0, fSUSW = 0.1 for the onshore region and fBED = 1.0, fBEDW = 1.0, fSUSW = 0.5 for the offshore region. However, since these combinations were derived based on the observation data on Maengbang beach in 2018, users should be careful when applying those results to other areas.
Keywords
beach erosion; cross-shore profile; Delft3D; sediment transport scaling factors; sensitivity analysis;
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