Field observation of wave overtopping at sea dike using shore-based video images

Japan, surrounded by sea, is constantly threatened by storm surges and beach erosions, for which protection works are being vigorously undertaken. As a measure for protection, facings of various armour blocks have come to be used for the seawalls and embankments. This is a skillful utilization of characteristic functions of armour blocks to dissipate and absorb wave energy effectively. However, systematic experiments and studies on this subject have been conducted only in very few cases. This paper treats of the effect of the facing of armour blocks on wave overtopping by comparison of the quantity of waves topped over the vertical seawal] with facing and that of without facing. Furthermore, this paper attempts to compare the results of the field observation and the experiments on the quantity of wave overtopping. Based on these data, the authors present a design criterion of the crown height of seawall with armour block facing.

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Berm Effects on the Probability Distribution of Individual Wave Overtopping Discharge over a Low-Crested Sea Dike

Journal of Waterway Port Coastal and Ocean Engineering ◽

10.1061/(asce)ww.1943-5460.0000507 ◽

2019 ◽

Vol 145 (4) ◽

pp. 04019012

Author(s):

Quanhe Ju ◽

Shuguang Liu ◽

Wenrui Huang ◽

Guihui Zhong

Keyword(s):

Probability Distribution ◽

Wave Overtopping ◽

Individual Wave ◽

Sea Dike

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Influence of Low Sea-Dike Crown-Walls on Wave Overtopping Discharge

Coastal Engineering Journal ◽

10.1142/s0578563413500137 ◽

2013 ◽

Vol 55 (4) ◽

pp. 1350013-1-1350013-23 ◽

Cited By ~ 4

Author(s):

Thieu Quang Tuan

Keyword(s):

Wave Overtopping ◽

Sea Dike

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Wave overtopping over a sea dike

Journal of Computational Physics ◽

10.1016/j.jcp.2004.01.022 ◽

2004 ◽

Vol 198 (2) ◽

pp. 686-726 ◽

Cited By ~ 54

Author(s):

Tingqiu Li ◽

Peter Troch ◽

Julien De Rouck

Keyword(s):

Wave Overtopping ◽

Sea Dike

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Reduction of Wave Overtopping and Force Impact at Harbor Quays Due to Very Oblique Waves

Journal of Marine Science and Engineering ◽

10.3390/jmse8080598 ◽

2020 ◽

Vol 8 (8) ◽

pp. 598

Author(s):

Sebastian Dan ◽

Corrado Altomare ◽

Tomohiro Suzuki ◽

Tim Spiesschaert ◽

Toon Verwaest

Keyword(s):

Experimental Tests ◽

Wave Impact ◽

Wave Overtopping ◽

Oblique Waves ◽

Quay Wall ◽

Force Impact ◽

Force Reduction ◽

Wave Induced ◽

Best Fit ◽

Sea Dike

Physical model experiments were conducted in a wave tank at Flanders Hydraulics Research, Antwerp, Belgium, to characterize the wave overtopping and impact force on vertical quay walls and sloping sea dike (1:2.5) under very oblique wave attack (angle between 45° and 80°). This study was triggered by the scarce scientific literature on the overtopping and force reduction due to very oblique waves since large reduction is expected for both when compared with the perpendicular wave attack. The study aimed to compare the results from the experimental tests with formulas derived from previous experiments and applicable to a Belgian harbor generic case. The influence of storm return walls and crest berm width on top of the dikes has been analyzed in combination with the wave obliqueness. The results indicate significant reduction of the overtopping due to very oblique waves and new reduction coefficients were proposed. When compared with formulas from previous studies the proposed coefficients indicate the best fit for the overtopping reduction. Position of the storm return wall respect to the quay edge rather than its height was found to be more important for preventing wave induced overtopping. The force reduction is up to approximately 50% for the oblique waves with respect to the perpendicular wave impact and reduction coefficients were proposed for two different configurations a sea dike and vertical quay wall, respectively.

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