Enhancement of Sea Wave Potential Energy with Under-Sea Periodic Structures: A Simulation and Laboratory Study

This paper is devoted to a theoretical investigation on the wave amplitude enhancement of surface sea water waves with under-sea periodic arrays of cylinders. A two-dimensional shallow water wave equation is derived and solved by using the plane-wave expansion method. The lattice types studied here...

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Bibliographic Details
Published in:Applied sciences 2017-08, Vol.7 (8), p.782
Main Authors: Chiu, Shuo-Feng, Wang, Jyun-Jie, Wang, Ssu-Che, Chao, Sheng
Format: Article
Language:English
Subjects:
Chemical analysis
Computer simulation
Cylinders
Energy
Feasibility studies
Lattices (mathematics)
Periodic structures
Potential energy
Seawater
Shallow water
shallow water wave equation
Surface water
surface water wave
Water analysis
Water waves
wave amplitude enhancement
wave propagation
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Summary:This paper is devoted to a theoretical investigation on the wave amplitude enhancement of surface sea water waves with under-sea periodic arrays of cylinders. A two-dimensional shallow water wave equation is derived and solved by using the plane-wave expansion method. The lattice types studied here include triangular, square and hexagonal lattices. These under-sea structures alter the sea bottom topography and induce constructive interference on the surface water waves. Given that the wave potential energy is dependent on the square of the wave amplitude, this mechanism can thus be used to increase the potential energy. It is shown that the enhancement factor depends on two geometric parameters and the maximum wave amplitude can be found by adjusting the two geometric parameters. Among the lattice types, the triangular and square lattice structures can induce more wave amplitude enhancement (and thus potential energy) than the hexagonal structures. Guided by numerical simulations, we have performed a reduced-scale water tank experiment to demonstrate the feasibility of the proposed idea. Preliminary experimental results show promising evidence of the predicted wave amplitude enhancement, suggesting perspective real-scale nearshore deployment and test.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7080782