Evaluation of the Hydraulic Performance of a Rear-Parapet Vertical Breakwater under Regular Waves through Hydraulic Experiments
Abstract
:1. Introduction
2. Experimental Setup and Analytical Methods
2.1. Wave Channel
2.2. Installation of Breakwater Models and Wave Gauges
2.3. Breakwater Models with Pressure Gauges
2.4. Test Waves
2.5. Wave Force Calculation
2.6. Required Self-Weight Calculation
2.7. Bearing Pressure Calculation
3. Experimental Results and Discussions
3.1. Runup, Reflection, and Pressure
3.2. Wave Force
3.3. Required Self-Weight
3.4. Bearing Pressure
4. Conclusions
- The introduction of a rear parapet can reduce the maximum wave force acting on a breakwater. Up to 20.78% reduction is possible under the tested conditions. This reduction is feasible because the wave energy reflected from the parapet is significantly attenuated by the wave breaking, splashing, waterfall, etc., in addition to allowing the wave force acting on the parapet to move with the phase difference by moving the parapet to the harborside.
- Impulsive wave pressure, one of the problems experienced by rear parapets, can be mitigated by increasing the height at the offshore freeboard , and the more the parapet fits the inner side of the port, the more advantageous. Under the experimental conditions, impulsive wave pressure was not generated when the incident wave was 0.5 times or more, and the magnitude of the impulsive wave pressure was significantly reduced when the breakwater was installed inside the port rather than at the breakwater center.
- By applying a rear parapet, it is possible to increase the economic efficiency of a breakwater. Under the experimental conditions, the required self-weight and maximum bearing pressure can be reduced by up to 82.7% and 47.6% of the conventional values.
Author Contributions
Funding
Conflicts of Interest
References
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h (cm) | T (s) | H (cm) |
---|---|---|
40.0 | 1.21 | 10.20 |
1.51 | 10.20 | |
1.52 | 15.10 | |
2.01 | 9.87 | |
2.02 | 15.29 | |
42.5 | 1.21 | 10.04 |
1.51 | 9.94 | |
1.52 | 15.14 | |
2.01 | 10.01 | |
2.02 | 15.10 | |
45.0 | 1.21 | 9.99 |
1.50 | 10.00 | |
1.51 | 14.90 | |
2.01 | 10.14 | |
2.01 | 15.10 |
h (cm) | H (cm) | T (s) | Model | Contribution Ratio (%) | |||||
---|---|---|---|---|---|---|---|---|---|
40.0 | 10.20 | 1.21 | 0.9804 | 1 2 3 | 0 0.1021 0.2041 | 1.0 0.9748 0.9791 | 0.9899 0.9724 0.9747 | 0.0101 0.0024 0.0044 | 1.01 0.25 0.45 |
10.20 | 1.51 | 0.9804 | 1 2 3 | 0 0.0758 0.1516 | 1.0 0.9855 0.9841 | 0.9904 0.9835 0.9806 | 0.0096 0.0020 0.0035 | 0.96 0.20 0.36 | |
15.10 | 1.52 | 0.6623 | 1 2 3 | 0 0.0752 0.1504 | 1.0 0.9149 0.9464 | 0.9541 0.9128 0.9438 | 0.0459 0.0021 0.0026 | 4.59 0.23 0.27 | |
9.87 | 2.01 | 1.0132 | 1 2 3 | 0 0.0538 0.1076 | 1.0 0.9800 0.9827 | 0.9902 0.9790 0.9811 | 0.0098 0.0010 0.0017 | 0.98 0.10 0.17 | |
15.29 | 2.02 | 0.6540 | 1 2 3 | 0 0.0535 0.1070 | 1.0 0.8831 0.9004 | 0.9295 0.8819 0.8991 | 0.0705 0.0012 0.0013 | 7.05 0.13 0.15 | |
42.5 | 10.04 | 1.21 | 0.7470 | 1 2 3 | 0 0.1004 0.2007 | 1.0 0.9580 0.9459 | 0.9548 0.9553 0.9372 | 0.0452 0.0027 0.0087 | 4.52 0.28 0.92 |
9.94 | 1.51 | 0.7545 | 1 2 3 | 0 0.0742 0.1483 | 1.0 0.9341 0.9512 | 0.9628 0.9325 0.9458 | 0.0372 0.0016 0.0054 | 3.72 0.17 0.57 | |
15.14 | 1.52 | 0.4954 | 1 2 3 | 0 0.0735 0.1471 | 1.0 0.8465 0.8897 | 0.8934 0.8191 0.8872 | 0.1066 0.0274 0.0025 | 10.66 3.23 0.28 | |
10.01 | 2.01 | 0.7493 | 1 2 3 | 0 0.0524 0.1049 | 1.0 0.9360 0.9574 | 0.9696 0.9350 0.9553 | 0.0304 0.0010 0.0021 | 3.04 0.11 0.22 | |
15.10 | 2.02 | 0.4967 | 1 2 3 | 00 .0521 0.1043 | 1.0 0.8450 0.8531 | 0.8914 0.8438 0.8518 | 0.1086 0.0013 0.0014 | 10.86 0.15 0.16 | |
45.0 | 9.99 | 1.21 | 0.5005 | 1 2 3 | 0 0.0989 0.1978 | 1.0 0.8823 0.9036 | 0.9172 0.8796 0.8815 | 0.0828 0.0027 0.0221 | 8.28 0.31 2.45 |
10.00 | 1.50 | 0.50 | 1 2 3 | 0 0.0733 0.1466 | 1.0 0.8640 0.9107 | 0.9255 0.8622 0.9057 | 0.0745 0.0018 0.0050 | 7.45 0.21 0.55 | |
14.90 | 1.51 | 0.3356 | 1 2 3 | 0 0.0727 0.1454 | 1.0 0.8332 0.8223 | 0.8593 0.6840 0.8187 | 0.1407 0.1492 0.0036 | 14.07 17.91 0.43 | |
10.14 | 2.01 | 0.4931 | 1 2 3 | 0 0.0512 0.1024 | 1.0 0.8822 0.9016 | 0.9355 0.8812 0.8984 | 0.0645 0.0010 0.0033 | 6.45 0.11 0.36 | |
15.10 | 2.01 | 0.3311 | 1 2 3 | 0 0.0512 0.1024 | 1.0 0.8812 0.7922 | 0.8596 0.7617 0.7900 | 0.1404 0.1196 0.0022 | 14.04 13.57 0.27 |
h (cm) | H (cm) | T (s) | Model | (cm) | for Model Scale | for Real Scale | |
---|---|---|---|---|---|---|---|
40.0 | 15.29 | 2.02 | 1 | 0 | 7.43 | 10.36 | 414.25 |
2 | 0.0535 | 9.18 | 7.40 | 296.00 | |||
3 | 0.1070 | 9.18 | 7.55 | 301.84 | |||
42.5 | 15.10 | 2.02 | 1 | 0 | 6.72 | 11.92 | 476.98 |
2 | 0.0521 | 9.40 | 7.21 | 288.25 | |||
3 | 0.1043 | 9.43 | 7.25 | 289.95 | |||
45.0 | 15.10 | 2.01 | 1 | 0 | 6.46 | 13.07 | 522.91 |
2 | 0.0512 | 6.16 | 12.09 | 483.52 | |||
3 | 0.1024 | 9.77 | 6.85 | 273.86 |
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Lee, B.W.; Park, W.-S. Evaluation of the Hydraulic Performance of a Rear-Parapet Vertical Breakwater under Regular Waves through Hydraulic Experiments. Water 2020, 12, 2428. https://doi.org/10.3390/w12092428
Lee BW, Park W-S. Evaluation of the Hydraulic Performance of a Rear-Parapet Vertical Breakwater under Regular Waves through Hydraulic Experiments. Water. 2020; 12(9):2428. https://doi.org/10.3390/w12092428
Chicago/Turabian StyleLee, Byeong Wook, and Woo-Sun Park. 2020. "Evaluation of the Hydraulic Performance of a Rear-Parapet Vertical Breakwater under Regular Waves through Hydraulic Experiments" Water 12, no. 9: 2428. https://doi.org/10.3390/w12092428