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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): 335-343. doi: https://doi.org/10.9765/KSCOE.2019.31.6.335
낮은 마운드 높이에 높은 상치구조물을 갖는 경사식 호안(LMHW 호안)의 월파량에 대한 실험적 연구
정재상, 윤재선
한국농어촌공사 농어촌연구원
Experimental Study for Overtopping Discharges of Sea Dike having Low Mound and High Wave Wall (LMHW)
Jae-Sang Jung, Jae-Seon Yoon
Rural Research Institute, Korea Rural Community Corporation, 870 Haeanro, Sangnok-gu, Ansan, Gyeonggi-do 15634, Korea
Corresponding author: Jae-Sang Jung ,Tel: +82-31-400-1878, Fax: +82-31-400-1612, Email: fingon@ekr.or.kr
Received: October 14, 2019;  Revised: November 14, 2019.  Accepted: November 16, 2019.
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ABSTRACT
Overtopping discharge for sea dike having low mound and high wave wall (LMHW sea dike) is investigated with hydraulic experiments in this study. Vertical, Flare and Bullnose type wave walls are selected and Tetrapods (double layer) and Accropode (one layer) are adopted for armour layers of the front slope. The results of the hydraulic experiments are compared to the overtopping formulas for armoured rubble slopes and vertical sea dikes suggested by EurOtop Manual. Predicted overtopping discharges are underestimated as the roughness efficiency factors (γf) of armour blocks suggested by EurOtop are adopted when the overtopping formula for armoured rubble slopes sea dike is used. Meanwhile the predicted overtopping discharges agree well with the hydraulic experiments when the modified roughness efficiency factors redefined by multiplying efficiency factor of the heights of armoured crest berm and wave wall (γAR) are adopted. Return wall effects on a vertical wall (Kortenhaus et al., 2003; Pearson et al., 2004a) and the effects on a smooth dike slope (Van Doorslaer et al., 2015) in EurOtop Manual are investigated for Flare and Bullnose type wave walls. As a results of the comparison between experimental results and 2 formulas, return wall effect on a smooth dike was more valid for LMHW sea dike.
Keywords: overtopping discharge, sea dike having low mound and high wave wall, hydraulic experiments, EurOtop manual
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