| 波浪作用下沙坝剖面形成过程的数值模拟 |
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| 引用本文： | 张弛,郑金海,王义刚.波浪作用下沙坝剖面形成过程的数值模拟[J].水科学进展,2012,23(1):104-109. |
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| 作者姓名： | 张弛 郑金海 王义刚 |
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| 作者单位： | 1.河海大学水文水资源与水利工程科学国家重点实验室, 江苏南京 210098; |
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| 基金项目： | 国家重点基础研究发展计划(973)资助项目(2010CB429002);河海大学水文水资源与水利工程科学国家重点实验室专项经费资助项目(2009585812)~~ |
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| 摘 要： | 建立了波浪、底部离岸流、泥沙运动和沙滩剖面演变耦合数学模型,模拟了实验室中波浪作用下沙坝剖面的形成过程,讨论了各个物理参数对剖面上的水动力和地形变化的影响。通过参数率定,较好地复演了不规则波作用下沙滩地形由均匀斜坡向沙坝剖面的演变,波高、底部离岸流、输沙率和剖面演变的计算结果与实测数据吻合良好。采用数值实验和误差分析方法,讨论了破碎波水滚倾角、泥沙扩散系数和床面休止角等物理参数对计算结果的影响。研究表明,所建立的模型能较好地描述波浪作用下沙坝剖面形成过程中的重要物理机制。
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| 关 键 词： | 波浪 泥沙运动 沙坝 数学模型 |
| 收稿时间： | 2010-05-05 |
Numerical simulation of wave-induced sandbar formation |
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| ZHANG Chi
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ZHENG Jin-hai
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WANG Yi-gang.Numerical simulation of wave-induced sandbar formation[J].Advances in Water Science,2012,23(1):104-109. |
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| Authors: | ZHANG Chi ZHENG Jin-hai WANG Yi-gang |
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| Institution: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;3.Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing 210098, China |
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| Abstract: | A process-based numerical model is developed to simulate the formation of a sandbar beach profile,which includes a set of sub-models for wave,undertow,sediment transport,and bed evolution.The model is validated to simulate the transformation of a gently sloping beach profile to a sandbar beach profile during 12 hours under random waves.The calculated wave height,undertow velocity,sediment transport rate and bed elevation agree well with the measured data.Additional numerical tests are performed to investigate the effects of the surface roller slope,the Schmidt number and the bed repose angle on the hydrodynamics and the resulting profile evolution.It is demonstrated that the present model can well represent the important physical mechanisms of the wave-induced sandbar formation. |
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| Keywords: | wave sediment transport sandbar numerical model |
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