Modified McCormicks model for equilibrium shorelines behind a detached breakwater |
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| Authors: | T -W Hsu C -D Jan C -C Wen |
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| Institution: | Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan |
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| Abstract: | Experimental data of equilibrium shorelines behind a detached breakwater obtained by previous investigators were collected and re-reviewed to investigate the major parameters affecting the shoreline shapes. The result shows that the equilibrium shorelines depend not only on the breakwater length B and the distance of the breakwater from the initial shoreline S, but also on the incident wave steepness H0/L0, beach slope Sb and the sand size D50. Most of equilibrium shorelines behind a detached breakwater could be approximately described by a couple of elliptic curves as proposed by McCormick (Ports, Coastal & Ocean Engineering ASCE 119, 1993, p. 657). However, after re-examination, this paper shows that the dimensionless semiminor axis b/S and the dimensionless distance G/b in the McCormick’s elliptic-curve model should be modified, as compared with the available experimental data. The modified expressions of b/S and G/b were proposed, and the performances of the modified expressions were also detaily examined in this paper. |
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