| ZHAO Hongjun,SONG Zhiyao,XU Fumin,LI Ruijie. 2010. An extended time-dependent numerical model of the mild-slope equation with weakly nonlinear amplitude dispersion. Acta Oceanologica Sinica, (2):5－13 |
| An extended time-dependent numerical model of the mild-slope equation with weakly nonlinear amplitude dispersion |
| An extended time-dependent numerical model of the mild-slope equation with weakly nonlinear amplitude dispersion |
| Received:January 15, 2009 Revised:November 10, 2009 |
| DOI：10.1007/s13131-010-0017-Z |
| Key words:time-dependent mild-slope equation nonlinear amplitude dispersion steep or rapidly varying topography bottom friction wave breaking |
| 中文关键词: time-dependent mild-slope equation nonlinear amplitude dispersion steep or rapidly varying topography bottom friction wave breaking |
| 基金项目:Open Fund of Key Laboratory of Coastal Disasters and Defence (Ministry of Education) and National Natural Science Foundation of China under contract No. 50779015. |
| Author Name | Affiliation | E-mail | | ZHAO Hongjun | Key Laboratory of Coastal Disasters and Defence, Ministry of Education, Hohai University, Nanjing 210098, China
Ocean College, Hohai University, Nanjing 210098, China | | | SONG Zhiyao | Ocean College, Hohai University, Nanjing 210098, China
Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210097, China | Zhiyaosong@sohu.com | | XU Fumin | Key Laboratory of Coastal Disasters and Defence, Ministry of Education, Hohai University, Nanjing 210098, China
Ocean College, Hohai University, Nanjing 210098, China | | | LI Ruijie | Key Laboratory of Coastal Disasters and Defence, Ministry of Education, Hohai University, Nanjing 210098, China
Ocean College, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| In the present paper, by introducing the effective wave elevation, we transform the extended elliptic mild-slope equation with bottom friction, wave breaking and steep or rapidly varying bottom topography to the simplest time-dependent hyperbolic equation. Based on this equation and the empirical nonlinear amplitude dispersion relation proposed by Li et al. (2003), the numerical scheme is established. Error analysis by Taylor expansion method shows that the numerical stability of the present model succeeds the merits in Song et al. (2007)'s model because of the introduced dissipation terms. For the purpose of verifying its performance on wave nonlinearity, rapidly varying topography and wave breaking, the present model is applied to study:(1) wave refraction and diffraction over a submerged elliptic shoal on a slope (Berkhoff et al., 1982); (2) Bragg reflection of monochromatic waves from the sinusoidal ripples (Davies and Heathershaw, 1985); (3) wave transformation near a shore attached breakwater (Watanabe and Maruyama, 1986). Comparisons of the numerical solutions with the experimental or theoretical ones or with those of other models (REF/DIF model and FUNWAVE model) show good results, which indicate that the present model is capable of giving favorably predictions of wave refraction, diffraction, reflection, shoaling, bottom friction, breaking energy dissipation and weak nonlinearity in the near shore zone. |
| 中文摘要: |
| In the present paper, by introducing the effective wave elevation, we transform the extended elliptic mild-slope equation with bottom friction, wave breaking and steep or rapidly varying bottom topography to the simplest time-dependent hyperbolic equation. Based on this equation and the empirical nonlinear amplitude dispersion relation proposed by Li et al. (2003), the numerical scheme is established. Error analysis by Taylor expansion method shows that the numerical stability of the present model succeeds the merits in Song et al. (2007)'s model because of the introduced dissipation terms. For the purpose of verifying its performance on wave nonlinearity, rapidly varying topography and wave breaking, the present model is applied to study:(1) wave refraction and diffraction over a submerged elliptic shoal on a slope (Berkhoff et al., 1982); (2) Bragg reflection of monochromatic waves from the sinusoidal ripples (Davies and Heathershaw, 1985); (3) wave transformation near a shore attached breakwater (Watanabe and Maruyama, 1986). Comparisons of the numerical solutions with the experimental or theoretical ones or with those of other models (REF/DIF model and FUNWAVE model) show good results, which indicate that the present model is capable of giving favorably predictions of wave refraction, diffraction, reflection, shoaling, bottom friction, breaking energy dissipation and weak nonlinearity in the near shore zone. |
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