INTERNAL VELOCITY FIELD OF TSUNAMI ACTING ON A VAERTICAL WALL IN THE TRANSITION PROCESS FROM IMPACT WAVE PRESSURE TO SUSTAINED WAVE PRESSURE
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- MIZUTANI Natsuki
- Osaka Sangyo University
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- MIYAJIMA Masahiro
- Osaka Sangyo University
Bibliographic Information
- Other Title
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- 津波による衝撃波圧から持続波圧への遷移過程と内部流速場の関係
- ツナミ ニ ヨル ショウゲキ ハアツ カラ ジゾク ハアツ エ ノ センイ カテイ ト ナイブ リュウソクジョウ ノ カンケイ
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Abstract
In this study, internal velocity fields of tsunami acting on a vertical wall were measured by PIV with measurements of wave pressure and surface elevation at the wall. A large scale vortex appears at the corner of the bottom of the wall. The main stream of tsunami avoids the vortex and then the acting point of the main stream moves up along the wall. As the result, the wave pressure values around the bottom of the wall correspond to the hydrostatic pressure value calculated by the surface elevation at that time. The wave pressure values above the vortex exceed the hydrostatic pressure values, because of the action of the dynamical pressure of the main stream of tsunami. When the splashed water falls down on the main stream, the all of wave pressure values have the maximal values. At that time, the horizontal wave force also has the maximal value.
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) 71 (2), I_937-I_942, 2015
Japan Society of Civil Engineers