Spectral wave transformation model for simulating refraction-diffraction with strongly reflecting coastal structures |
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| Authors: | ZHENG Jinhai NGUYEN Viet Thanh and ZHANG Chi |
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| Institution: | State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;College of Harbor Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | On the basis of the wave action balance equation which incorporates refraction, diffraction, reflec-
tion and wave-current interaction, a directional spectral wave transformation model WABED is
developed for predicting the irregular wave refraction-diffraction with strongly reflecting structures
in coastal regions. In the model, diffraction is taken into account by introducing a term formulated
from a parabolic approximation wave equation, and reflection is calculated through a back-marching
numerical approach at the reflecting boundary. Two experimental data sets are used to examine
the performance of present model with regard to wave characteristics around reflecting coastal
structures. One is from a physical experiment at idealized inlet with parallel jetties, while the
other is from a laboratory study on a coastal project of the concave breakwater. Reasonably good
agreements are found for both cases, revealing the applicability of the present model for predicting
combined wave refraction-diffraction processes with strongly reflecting coastal structures. |
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