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Title |
Analysis of the Correlation between ERA5-based Climate Indicators and the Chloride Diffusion Coefficient of Marine Concrete
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Authors |
남우석(Woo Suk Nam) ; 임홍재(Hong Jae Yim) |
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DOI |
https://doi.org/10.4334/JKCI.2026.38.4.499 |
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Keywords |
ERA5 재분석 자료; 겉보기 염화물 확산계수; 기후 지표; 해양환경; 편향 보정 ERA5 reanalysis; chloride diffusion coefficient; climate indicator; marine concrete; bias correction |
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Abstract |
This study quantitatively analyzed the effects of various climatic factors on the chloride diffusion coefficient of marine concrete bridges by integrating 141 chloride profile datasets from 19 coastal bridges along the west and south coasts of Korea with bias-corrected ERA5 reanalysis data. A statistical analysis confirmed that the geographic location is a more dominant variable than the exposure zone (ANOVA, p = 0.0007). Seven climate?ocean variables were selected; six were calibrated from ERA5 using variance scaling, linear scaling, and quantile mapping, while salinity was obtained from observational data. From these, 21 static climate indicators (mean, extreme, and cumulative) were derived. A correlation analysis revealed that wave variables were most strongly associated with cumulative indicators, temperature?humidity with extreme indicators, and wind speed?salinity with mean indicators. After multicollinearity screening, five variables were retained for multiple regression, improving R2 by 6.1 percentage points and reducing the RMSE and MAE by 19.4 % and 21.2 %, respectively. Extreme seawater temperatures (p = 0.027) and mean salinity levels (p = 0.035) were identified as significant governing variables. The south coast exhibited diffusion coefficients approximately 14 % higher than those of the west coast due to the combined effects of higher temperature, salinity, wind speed, and wave energy levels, highlighting the need for regional differentiation in the current Korean durability design standards.
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