NUMERICAL STUDY OF TSUNAMI PROPAGATION USING A TURBULENCE MODEL
-
- KUTSUZAWA Yuki
- 東北大学 大学院工学研究科
-
- TINH Nguyen Xuan
- 東北大学 大学院工学研究科
-
- WATANABE Kazuya
- 秋田大学 理工学研究科
-
- TANAKA Hitoshi
- 東北大学 大学院工学研究科
Bibliographic Information
- Other Title
-
- 乱流モデルを用いた津波伝播の数値計算
- ランリュウ モデル オ モチイタ ツナミ デンパ ノ スウチ ケイサン
Search this article
Description
The 2011 Great Earthquake and Tsunami has caused huge morphological changes along the coastal areas in the Tohoku region. One of the key parameters causing these dramatical damages is the tsunami bottom shear stress acting on the sea bottom. In general, the tsunami wave is a longwave and the steady flow resistance method have been practically used in many tsunami numerical models to estimate the bottom shear stress by mean of using the depth-averaged velocity and friction coefficient (Method 1). However, the actual tsunami waves are unsteady flow conditions, so the application of Method 1 may inappropriate. Therefore, the EFDC vertical turbulent model is applied to take into account the effect of complex boundary layer development under unsteady tsunami condition (Method 2). In this study, these both methods are applied to calculate the tsunami bottom shear stress and compare between them. The shape of vertical velocity distribution results from the Method 2 are similar to the wave friction method. And bottom shear stresses by Method 2 are overall larger compared to the Method 1 under tsunami wave impacts.
Journal
-
- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
-
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74 (2), I_163-I_168, 2018
Japan Society of Civil Engineers