STUDY ON FLOW REGIME IN A SEA BOTTOM BOUNRAY LAYER BENEATH TSUNAMI
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- TANAKA Hitoshi
- 東北大学大学院 工学研究科土木工学専攻
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- TINH Nguyen Xuan
- 東北大学大学院 工学研究科土木工学専攻
Bibliographic Information
- Other Title
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- 津波の下での底面境界層のflow regimeに関する研究
- ツナミ ノ シタ デ ノ テイメン キョウカイソウ ノ flow regime ニ カンスル ケンキュウ
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Abstract
<p> In this paper, we investigated the development process of the tsunami-induced bottom boundary layer under the one-dimensional tsunami propagation from the tsunami source to the shallow water. Two simulation methods for the tsunami shoaling process are ultilized; one is calculated by the Green’s law and the other one is from the results of the shallow water equation model. Based on the analyzed results, it is found that the tsunami-induced bottom boundary layer at the tsunami source area is laminar flow state at first and then gradually becomes the smooth tubuluent and transition flows in the shallow region. As a result, a simple assumption of rough turbulent regime, as commonly assumed in Manning’s formula, might not be valid. It is also found that the tsunami-induced bottom shear stress by the steady friction law, which is frequently used in the numerical calculation of tsunami, has no correlation with estimation in the present method.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 76 (2), I_397-I_402, 2020
Japan Society of Civil Engineers
