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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(6); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(6): 493-500. doi: https://doi.org/10.9765/KSCOE.2019.31.6.493
해빈 단면의 지형변화 모의를 위한 Delft3D 내의 표사이동 관련 매개변수의 민감도 분석
양정아1, 손상영2
1고려대학교 초대형건설기술연구소
2고려대학교 건축사회환경공학부
Sensitivity Analysis of Sediment Transport Scaling Factors on Cross-Shore Beach Profile Changes using Deflt3D
Jung-A Yang1, Sangyoung Son2
1Research Institute for Mega Construction, Korea University
2School of Civil, Environment & Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
Received: November 18, 2019;  Revised: December 23, 2019.  Accepted: December 26, 2019.
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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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