scholarly journals NUMERICAL STUDY ON INUNDATION PROCESS OF SMALL UNDERGROUND SPACE IN URBAN FLOOD

2007 ◽  
Vol 51 ◽  
pp. 541-546
Author(s):  
Nozomu YONEYAMA ◽  
Shinji AIHATA ◽  
Keiichi TODA ◽  
Daisuke YAMAMOTO
Keyword(s):  
Numerical Study ◽  
Underground Space ◽  
Urban Flood

scholarly journals A Simple and Robust Method for Simultaneous Consideration of Overland and Underground Space in Urban Flood Modeling

Water ◽  
2016 ◽  
Vol 8 (11) ◽  
pp. 494 ◽  
Author(s):  
Ah-Long Son ◽  
Byunghyun Kim ◽  
Kun-Yeun Han
Keyword(s):  
Underground Space ◽  
Robust Method ◽  
Flood Modeling ◽  
Urban Flood

Evacuation of aged persons from inundated underground space

2010 ◽  
Vol 62 (8) ◽  
pp. 1807-1812 ◽  
Author(s):  
T. Ishigaki ◽  
Y. Asai ◽  
Y. Nakahata ◽  
H. Shimada ◽  
Y. Baba ◽  
...  
Keyword(s):  
Ground Level ◽  
Underground Space ◽  
Specific Force ◽  
Shopping Malls ◽  
Flood Simulation ◽  
Urban Floods ◽  
Urban Flood ◽  
Unit Width ◽  
New Type ◽  
Safety Evacuation

Underground is an important space that supports function of cities, such as subways, shopping malls and basement parking. However in consequence a new type of disaster, the "urban flood" menaces these spaces. In the last decade, urban floods struck Tokyo, Nagoya and Fukuoka. When underground inundation occurs, people must evacuate to the ground as soon as possible. But, when such an inundation situation happens, aged persons may not be able to evacuate quickly to ground level. In this paper, the method of safety assessment for aged persons is discussed on the experimental results and flood simulation data in an underground space. As a criterion of the safety evacuation, the specific force per unit width is used in this study. From the result of experiments, it is difficult to implement safety evacuation when the specific force per unit width is over 0.100 m2 for the aged male.

scholarly journals Numerical study of building drag dissipation for- mulations in the integral porosity shallow water model

2018 ◽  
Vol 40 ◽  
pp. 06017
Author(s):  
Özgen Ilhan ◽  
Martin Bruwier ◽  
Jiaheng Zhao ◽  
Dongfang Liang ◽  
Pierre Archambeau ◽  
...  
Keyword(s):  
Shallow Water ◽  
Source Term ◽  
Numerical Study ◽  
Research Question ◽  
Computational Cost ◽  
Macroscopic Model ◽  
Water Model ◽  
Shallow Water Model ◽  
Urban Flood ◽  
Existing Building

The integral porosity shallow water model is a type of porous shallow water model for urban flood modeling, that defines two types of porosity, namely a volumetric porosity inside the computational cell and a conveyance porosity at each edge. Porosity terms are determined directly from the underlying building geometry, hence buildings do not need to be discretized exactly. This enables simulations with significantly reduced CPU time on meshes with cell sizes larger than the building size. Here, the macroscopic model view leads to an additional source term at the unresolved building-fluid interface, yielding a building drag dissipation source term. In literature, several formulations for this term can be found. The integral porosity shallow water model is sensitive to the building drag dissipation, and using the drag parameters as a calibration parameter enhances the accuracy of model results. However, the ideal way to achieve this is still an open research question. In this contribution, we present a simple technique to estimate building drag dissipation that uses the conveyance porosity configuration to estimate the projected area inside the cell, which is then used in a drag force equation. The advantage of this approach is that it is computationally inexpensive, no additional parameters need to be stored, and only a single parameter has to be calibrated. The proposed approach is compared with drag dissipation formulations from existing literature in a laboratory experiment that features a dam-break against an isolated obstacle. The aim of the comparison is to evaluate present existing building drag dissipation models with regard to accuracy and computational cost.

scholarly journals URBAN FLOOD ANALYSIS WITH UNDERGROUND SPACE

2010 ◽  
pp. 47-56 ◽  
Author(s):  
KEIICHI TODA ◽  
KAZUYA INOUE ◽  
SHINJI AIHATA
Keyword(s):  
Underground Space ◽  
Urban Flood ◽  
Flood Analysis

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones
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