Hydrodynamic Characteristics of Concave Front Pile-Supported Breakwaters with a Tubular Wave Screen
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 148, Issue 1
Abstract
Concave front pile-supported breakwaters, namely, Galveston wall-shaped pile-supported breakwater (GS-PSB) and circular cum parabola-shaped pile-supported breakwater (CPS-PSB), have proven to be more effective in dissipating incident wave energy compared with vertical front pile-supported breakwaters. However, the run-up and the dynamic pressures on the concave front are reported to be high. In the present experimental study, an attempt is made to improve the hydrodynamic performance of the GS-PSB and CPS-PSB by mounting tubular wave screens on their seaside as an additional energy dissipator. The tubular wave screen is comprised of horizontally aligned circular tube sections with diameter and spacing leading to a porosity of 25%. The models were subjected to the action of regular and random waves in a wave flume covering intermediate to deepwater conditions. It is found that the impact of tubular wave screen on the hydrodynamic performance of the both the models differs. While, the tubular wave screen marginally affects the transmission, the reduction in reflection is more for GS-PSB due to its steeper slope. The energy dissipation offered by GS-PSB in deepwater conditions is found to significantly improve due to the presence of the wave screen, which is not the case with the CPS-PSB model. The run-up and dynamic pressures over the concave profiles are found to reduce for both models. A qualitative assessment of overtopping for both the models is also reported herein.
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Acknowledgments
This research was funded by the Ministry of Shipping, Government of India (Grant No. S2-25021/2/2017-SM) and the support is gratefully acknowledged.
Notation
The following symbols are used in this paper:
- B
- width of the breakwater (i.e., length along the wave direction);
- D
- pile diameter;
- d
- water depth;
- f
- frequency;
- fp
- peak frequency;
- Hi
- incident wave height;
- Hr
- reflected wave height;
- Hs
- significant incident wave height;
- Ht
- transmitted wave height;
- H
- depth of submergence of the breakwater;
- Kr
- reflection coefficient;
- KL
- energy loss coefficient;
- Kt
- transmission coefficient;
- L
- wavelength;
- Lp
- wavelength corresponding to peak period;
- ps
- significant pressure (shoreward);
- psh
- shoreward peak pressure;
- Ru
- wave run-up height;
- Sη(f)
- spectral density of wave elevation;
- Sp(f)
- spectral density of pressure;
- SRu(f)
- spectral density of wave run-up;
- SWL
- still-water level;
- s
- pile-spacing in transverse direction;
- z
- elevation from still-water level;
- (ηi)s
- significant value of incident wave elevation;
- (ηr)s
- significant value of reflected wave elevation; and
- (ηt)s
- significant value of transmitted wave elevation.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 148 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 27, 2021
Accepted: Aug 13, 2021
Published online: Nov 1, 2021
Published in print: Jan 1, 2022
Discussion open until: Apr 1, 2022
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