scholarly journals RELATIONSHIPS BETWEEN FLUID MOTION AND PRESSURE VARIATION BY DAM-BREAK FLOWS COLLIDING WITH VERTICAL WALL

2018 ◽  
pp. 10
Author(s):  
Natsuki Mizutani ◽  
Jinji Umeda
Keyword(s):  
Tsunami Wave ◽  
Vertical Wall ◽  
Fluid Motion ◽  
Tohoku Earthquake ◽  
Wave Force ◽  
Pressure Variation ◽  
Dam Break ◽  
The 2011 Tohoku Earthquake ◽  
Dam Break Flow ◽  
Hazard Area

The 2011 Tohoku Earthquake Tsunami ran up the height of over 40 m and covered over 560 km2 of the coastal land area in Tohoku, Japan. The tsunami destroyed many structures and killed over 15,000 people. Appropriate measures should be taken against the next giant tsunami to avoid such tragedy. The generation mechanism of wave force is uncertain when a tsunami wave running on land collides with a structure. Especially, the fluid motion of a tip of tsunami wave immediately after the collision with a structure is very complicated. The information of the pressure distribution acting on the structure is necessary to construct buildings in the coastal hazard area. The purpose of this study is to clarify the relationships between the fluid motion and pressure variation by a dam-break flow as a tsunami flow on a dry bed colliding with structures.

scholarly journals A DESIGN METHOD OF THE SEA WALL AND WATER APRON BY THE TSUNAMI

2018 ◽  
pp. 24
Author(s):  
Hiroyuki Katou ◽  
Hiroyuki Iwase ◽  
Hideo Matsutomi
Keyword(s):  
Hydrostatic Pressure ◽  
Tsunami Wave ◽  
Design Method ◽  
Tohoku Earthquake ◽  
Wave Force ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake ◽  
Coastal Conservation ◽  
Sea Wall ◽  
Acting Force

Many of the coastal conservation facilities of the fishing port were severely damaged by the wave force of the 2011 Tohoku earthquake tsunami. We evaluated the tsunami wave force by conventional hydrostatic pressure for the sea wall of the fishing port. In addition, we considered the acting force and the acting range for the water apron of the sea wall during tsunami over flow, and presented a reasonable design of the sea wall. The tsunami wave force for the sea wall is not sufficiently examine by the seabed gradient, the position of structure and the back slope of the sea wall.

scholarly journals NUMERICAL AND HYDRAULIC EXPERIMENTS ON BORE PRESSURE DUE TO TSUNAMI

2018 ◽  
pp. 18
Author(s):  
Tatsuto Kimura ◽  
Masahiro Masuko ◽  
Naoki Fujii ◽  
Hideki Kaida ◽  
Naoto Kihara
Keyword(s):  
Steady State ◽  
Tsunami Wave ◽  
Three Dimensional ◽  
Tohoku Earthquake ◽  
Pressure Profile ◽  
Quasi Steady State ◽  
The 2011 Tohoku Earthquake ◽  
Wave Pressure ◽  
Pressure Profiles ◽  
State Regime

The 2011 Tohoku earthquake tsunami struck a wide area of the northeastern coast of Japan, and many coastal structures and buildings were damaged by the tsunami. Most of the buildings were damaged by the tsunami wave pressure. After the tsunami, characteristics of tsunami waive pressures have been investigated by many researcher, and are being clarified. As shown in previous studies, there are three regimes charactering the vertical pressure profiles. The first one is the impulsive pressure, which is observed just after the tsunami-bore impacted structures. In this regime, strong hydrodynamic pressures are generated by the fluid-solid impact process. After that, the bore pressure is observed, and both the hydrodynamic and hydrostatic pressures contribute the pressure profile. After that, the flow near the structures reaches a quasi-steady state, and the pressure profile becomes hydrostatic. Most of the evaluation equations of tsunami wave pressure proposed by the previous studies can be used against the impulsive pressures and the pressures in the quasi-steady-state regime. On the other hand, the characteristics and quantitative evaluations of the bore pressure remain immature. In this study, in order to clarify the characteristics of the bore pressure, experiments on the bore pressure are carried out, and furthermore, three-dimensional numerical simulations are also carried out.

scholarly journals Kinematic and dynamic analysis of dam break flow impact on vertical walls using weakly compressible SPH

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Petr Jančík ◽  
Tomáš Hyhlík
Keyword(s):  
Dynamic Analysis ◽  
Evaluation Method ◽  
Numerical Solutions ◽  
Vertical Wall ◽  
Dam Break ◽  
Column Height ◽  
Width Ratio ◽  
Total Force ◽  
Dam Break Flow ◽  
The Impact

This article presents the kinematic and dynamic analysis of a dam break flow based on data obtained from numerical solutions by the smoothed particle hydrodynamics (SPH) method. The method and original algorithms necessary for correct pressure evaluation are thoroughly described. The pressure evaluation method consists of data reading using virtual sensors and filtration in the time domain using the weight function. A simple convergence study showing the independency of the evaluated parameters of spatial resolution is presented together with validation of the introduced methods and algorithms using a simple hydrostatic problem and experimental data available in the literature. We focus on two parameters that describe the problem: distance of the downstream vertical wall from the edge of the liquid column and the column’s height to width ratio. We found that the impact can be divided into three consecutive phases characterized by specific kinematic (flow patterns) and dynamic (exerted pressure and forces) behavior and different roles of the investigated parameters during these phases. During the early stages of an impact, the column’s distance from the vertical wall plays a major role. A dependency between the column distance and the force peak in this stage was identified in the form of a power function. In the second stage, when a rolling wave emerges, the vertical wall position influences the shape of the wave and the pressure distribution on the wall. The total force is greater in this phase for lower column height to width ratios due to the higher total momentum of the liquid. In the third stage, when the rolling wave impacts the liquid surface, the employed methodology with two-dimensional solution and free-surface approach seems to reach its limits of applicability. A more complex modelling would be necessary to capture this phase of the impact properly.

Numerical and experimental investigation of three-dimensionality in the dam-break flow against a vertical wall

2018 ◽  
Vol 30 (4) ◽  
pp. 682-693 ◽  
Author(s):  
Mohamed M. Kamra ◽  
Nik Mohd ◽  
Cheng Liu ◽  
Makoto Sueyoshi ◽  
Changhong Hu
Keyword(s):  
Experimental Investigation ◽  
Vertical Wall ◽  
Dam Break ◽  
Dam Break Flow

Modeling Features of Both the Rupture Process and the Local Tsunami Wave Field from the 2011 Tohoku Earthquake

2017 ◽  
Vol 174 (10) ◽  
pp. 3919-3938 ◽  
Author(s):  
L. Lobkovsky ◽  
I. Garagash ◽  
B. Baranov ◽  
R. Mazova ◽  
N. Baranova
Keyword(s):  
Wave Field ◽  
Tsunami Wave ◽  
Tohoku Earthquake ◽  
Rupture Process ◽  
2011 Tohoku Earthquake ◽  
The 2011 Tohoku Earthquake

EXPERIMENTAL AND THEORETICAL STUDY ON FLOOD BORE PROPAGATION AND MUSHROOM JET GENERATION OF DAM-BREAK FLOW

2011 ◽  
Vol 1 (3) ◽  
Author(s):  
H. H. Hwung ◽  
Ray Yang ◽  
Y. C. Tie ◽  
W.Y. Hsu ◽  
P. C. Kuo ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Dam Break ◽  
Dam Break Flow
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