淡江大學機構典藏:Item 987654321/96260
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    題名: Numerical study of turbulence and wave damping induced by vegetation canopies
    作者: Ma, Gangfeng;James T. Kirby;Su, Shih-Feng;Jens Figlus;Shi, Fengyan
    貢獻者: 淡江大學水資源及環境工程學系
    關鍵詞: Vegetation canopy;Non-hydrostatic model;Wave attenuation;Vegetation-induced nearshore circulation
    日期: 2013-10
    上傳時間: 2014-03-06 17:31:15 (UTC+8)
    出版者: Amsterdam: Elsevier BV
    摘要: Vegetation canopies control mean and turbulent flow structure as well as surface wave processes in coastal regions. A non-hydrostatic RANS model based on NHWAVE (Ma et al., 2012) is developed to study turbulent mixing, surface wave attenuation and nearshore circulation induced by vegetation. A nonlinear k − ϵ model accounting for vegetation-induced turbulence production is implemented to study turbulent flow within the vegetation field. The model is calibrated and validated using experimental data from vegetated open channel flow, as well as nonbreaking and breaking random wave propagation in vegetation fields. It is found that the drag-related coefficients in the k − ϵ model Cfk and Cfϵ can greatly affect turbulent flow structure, but seldom change the wave attenuation rate. The bulk drag coefficient CD is the major parameter controlling surface wave damping by vegetation canopies. Using the empirical formula of Mendez and Losada (2004), the present model provides accurate predictions of vegetation-induced wave energy dissipation. Wave propagation through a finite patch of vegetation in the surf zone is investigated as well. It is found that the presence of a finite patch of vegetation may generate strong pressure-driven nearshore currents, with an onshore mean flow in the unvegetated zone and an offshore return flow in the vegetated zone.
    關聯: Coastal Engineering 80, pp.68–78
    DOI: 10.1016/j.coastaleng.2013.05.007
    顯示於類別:[水資源及環境工程學系暨研究所] 期刊論文

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