波浪通過海岸植生消能之數值模擬

楊子逸

doi:10.6342/NTU201900614

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波浪通過海岸植生消能之數值模擬

Numerical study of wave propagation through the coastal vegetation

楊子逸 , Masters　　Advisor：詹益齊　　

繁體中文 DOI： 10.6342/NTU201900614

海岸植生； XBeach ；植物阻力；阻力係數；波浪消散； Coastal vegetation ； XBeach ； Vegetation damping ； Drag coefficient ； Wave dissipation

Abstract │ Reference (59) │ Altmetrics

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The relationship between coastal vegetation and coastal environment involves many natural factors. This study explores the influence factors of vegetation drag force by changing different planting conditions, such as plant diameter, height and density with XBeach model for simulation. 
In previous studies, vegetation conditions of experiment were less variable. Most of the vegetation conditions in the experiment are with fixed diameter, height or density, and with unfixed wave boundary conditions and the measured attenuation of wave height.  Finally, parameters such as wave motion conditions, were added to obtain the relationship between the drag coefficient and the parameter. This relationship is limited by the experimental conditions, and thus the applicability is limited. In other words, after changing the experimental conditions or parameters, the relationship of the drag coefficient is no longer applicable.
	In order to solve this problem, XBeach numerical model is used to fit the drag coefficient by numerical experiment. The influence of drag coefficient and different vegetation conditions are investigated. These influence factors are then used to obtain an appropriate drag coefficient of regression relation with physically meaning. The obtained drag coefficient of regression relation is believed to overcome the shortcoming in the previous work, which the regression relation can be applied to only certain conditions. The simulation results show that the drag coefficient is affected by the relative height of vegetation and the Reynolds number. Through the above two influence factors, the relationship between the drag coefficients is obtained. When the geographical environments and vegetation conditions change, the drag coefficient can be quickly obtained by using this relationship.

Reference ( 59 ) 〈TOP〉

1. Anderson, M. E., Smith, J. M., Bryant, D. B., & McComas, R. G. (2013). Laboratory Studies of Wave Attenuation through Artificial and Real Vegetation (No. ERDC-TR-13-11). ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB.
2. Anderson, M. E., Smith, J. M., & McKay, S. K. (2011). Wave dissipation by vegetation. US Army Engineer Research and Development Center Coastal and Hydraulics Laboratory Vicksburg United States.
3. Asano, T., Deguchi, H., & Kobayashi, N. (1993). Interaction between water waves and vegetation. Coastal Engineering 1992, pp. 2709-2723.
4. Augustin, L. N., Irish, J. L., & Lynett, P. (2009). Laboratory and numerical studies of wave damping by emergent and near-emergent wetland vegetation. Coastal Engineering, 56(3), 332-340.
5. Bradley, K., & Houser, C. (2009). Relative velocity of seagrass blades: Implications for wave attenuation in low‐energy environments. Journal of Geophysical Research: Earth Surface, 114(F1).

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