Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)
- 2004.05a
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- Pages.257-262
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- 2004
Experimental Study on Wave Attenuating Effect of a Pneumatic Breakwater by Using a Multiple Parallel Manifold
다중 병렬 분기관을 이용한 압축공기 방파제의 소파효과에 관한 실험적 연구
- KIM JONG-WOOK (Hyundai Maritime Research Institute, Hyundai Heavy Industry Co. Ltd.) ;
- Shin Hyun-Soo (Hyundai Maritime Research Institute, Hyundai Heavy Industry Co. Ltd.)
- Published : 2004.05.01
Abstract
A series of preliminary model tests are performed to find out the wave attenuating effect of the pneumatic breakwater of environment friendly type, which is a bubble screen generated by releasing compressed air from a submerged multiple parallel manifold Rising bubbles induce vertical current, which produces horizontal currents flowing away from the bubble-screen area in both directions. Near bottom, the corresponding currents flow toward the bubble screen, thus completing the circulation pattern. The surface current moving against the direction of wave propagation causes some attenuation of the waves. It becomes more effective as the relative depth (d/ L) increases (short-period waves in deep water). With the same air-discharge, the multiple parallel manifold can be more effective for the attenuation of longer waves through optimum arrangement of manifold number. installation depth, manifold gap, etc. The pneumatic breakwater will give a wide utilization as a device for protecting harbor facilities and as a simple, mobile breakwater.
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