Urban flood simulation as a component of integrated earthquake disaster simulation system

2005 ◽  
Author(s):  
M. Tanigawa ◽  
T. Takahashi ◽  
T. Koto ◽  
I. Takeuchi ◽  
I. Noda
Keyword(s):  
Simulation System ◽  
Flood Simulation ◽  
Urban Flood ◽  
Earthquake Disaster

Bi-directional Coupling of an Unstructured Triangular Meshes-based Integrated Hydrodynamic Model for Heterogeneous Feature-based Urban Flood Simulation

2021 ◽  
Author(s):  
Guoqiang Peng ◽  
Zhuo Zhang ◽  
Tian Zhang ◽  
Zhiyao Song ◽  
Arif Masrur
Keyword(s):  
Water Flow ◽  
Urban Areas ◽  
Overland Flow ◽  
Coupled Model ◽  
Flood Simulation ◽  
Urban Flood ◽  
Essential Condition ◽  
Flow Processes ◽  
Feature Based ◽  
Heterogeneous Feature

Abstract Urban pluvial flash floods have become a matter of widespread concern, as they severely impact people’s lives in urban areas. Hydrological and hydraulic models have been widely used for urban flood management and urban planning. Traditionally, to reduce the complexity of urban flood modelling and simulations, simplification or generalization methods have been used; for example, some models focus on the simulation of overland water flow, and some models focus on the simulation of the water flow in sewer systems. However, the water flow of urban floods includes both overland flow and sewer system flow. The overland flow processes are impacted by many different geographical features in what is an extremely spatially heterogeneous environment. Therefore, this article is based on two widely used models (SWMM and ANUGA) that are coupled to develop a bi-directional method of simulating water flow processes in urban areas. The open source overland flow model uses the unstructured triangular as the spatial discretization scheme. The unstructured triangular-based hydraulic model can be better used to capture the spatial heterogeneity of the urban surfaces. So, the unstructured triangular-based model is an essential condition for heterogeneous feature-based urban flood simulation. The experiments indicate that the proposed coupled model in this article can accurately depict surface waterlogged areas and that the heterogeneous feature-based urban flood model can be used to determine different types of urban flow processes.

The importance of gully flow modelling to urban flood simulation

2019 ◽  
Vol 16 (5) ◽  
pp. 377-388
Author(s):  
Jiun-Huei Jang ◽  
Chi-Tai Hsieh ◽  
Tien-Hao Chang
Keyword(s):  
Flood Simulation ◽  
Urban Flood ◽  
Flow Modelling

Coastal Urban Flood Simulation Using FEM, GIS and Remote Sensing

2010 ◽  
Vol 24 (13) ◽  
pp. 3615-3640 ◽  
Author(s):  
S. S. Shahapure ◽  
T. I. Eldho ◽  
E. P. Rao
Keyword(s):  
Remote Sensing ◽  
Flood Simulation ◽  
Urban Flood ◽  
Gis And Remote Sensing

Hydrodynamic Modeling of Urban Flood Flows and Disaster Risk Reduction

2017 ◽  
Author(s):  
Brett F. Sanders
Keyword(s):  
Risk Reduction ◽  
Flood Risk ◽  
Disaster Risk Reduction ◽  
Disaster Risk ◽  
Accurate Approximation ◽  
Modeling Tools ◽  
Flood Simulation ◽  
Urban Flood ◽  
Flood Model ◽  
Flood Flows

Communities facing urban flood risk have access to powerful flood simulation software for use in disaster-risk-reduction (DRR) initiatives. However, recent research has shown that flood risk continues to escalate globally, despite an increase in the primary outcome of flood simulation: increased knowledge. Thus, a key issue with the utilization of urban flood models is not necessarily development of new knowledge about flooding, but rather the achievement of more socially robust and context-sensitive knowledge production capable of converting knowledge into action. There are early indications that this can be accomplished when an urban flood model is used as a tool to bring together local lay and scientific expertise around local priorities and perceptions, and to advance improved, target-oriented methods of flood risk communication. The success of urban flood models as a facilitating agent for knowledge coproduction will depend on whether they are trusted by both the scientific and local expert, and to this end, whether the model constitutes an accurate approximation of flood dynamics is a key issue. This is not a sufficient condition for knowledge coproduction, but it is a necessary one. For example, trust can easily be eroded at the local level by disagreements among scientists about what constitutes an accurate approximation. Motivated by the need for confidence in urban flood models, and the wide variety of models available to users, this article reviews progress in urban flood model development over three eras: (1) the era of theory, when the foundation of urban flood models was established using fluid mechanics principles and considerable attention focused on development of computational methods for solving the one- and two-dimensional equations governing flood flows; (2) the era of data, which took form in the 2000s, and has motivated a reexamination of urban flood model design in response to the transformation from a data-poor to a data-rich modeling environment; and (3) the era of disaster risk reduction, whereby modeling tools are put in the hands of communities facing flood risk and are used to codevelop flood risk knowledge and transform knowledge to action. The article aims to inform decision makers and policy makers regarding the match between model selection and decision points, to orient the engineering community to the varied decision-making and policy needs that arise in the context of DRR activities, to highlight the opportunities and pitfalls associated with alternative urban flood modeling techniques, and to frame areas for future research.

Development of 1D–2D Urban Flood Simulation Model Based on Modified Cellular Automata Approach

2021 ◽  
Vol 26 (2) ◽  
pp. 04020065
Author(s):  
Hamed Tavakolifar ◽  
Hossein Abbasizadeh ◽  
Sara Nazif ◽  
Ebrahim Shahghasemi
Keyword(s):  
Cellular Automata ◽  
Simulation Model ◽  
Flood Simulation ◽  
Urban Flood ◽  
Model Based

scholarly journals Using unmanned aerial vehicle and volunteered geographic information to sophisticate urban flood modelling

2020 ◽  
Author(s):  
Yuan-Fong Su ◽  
Yan-Ting Lin ◽  
Jiun-Huei Jang ◽  
Jen-Yu Han
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Urban Areas ◽  
Flash Flood ◽  
Volunteered Geographic Information ◽  
Geographic Information ◽  
Model Verification ◽  
Loss Assessment ◽  
Flood Simulation ◽  
Urban Flood ◽  
Aerial Vehicle

Abstract. Sophisticated flood simulation in urban areas is a challenging task due to the difficulties in data acquisition and model verification. This study incorporates three rapid-growing technologies, i.e. volunteered geographic information (VGI), unmanned aerial vehicle (UAV), and computational flood simulation (CFS) to reconstruct the flash flood event occurred in 14 June 2015, GongGuan, Taipei. The high-resolution digital elevation model (DEM) generated by a UAV and the real-time VGI photos acquired from social network are served to establish and validate the CFS model, respectively. The DEM data are resampled based on two grid sizes to evaluate the influence of terrain resolution on flood simulations. The results show that flood scenario can be more accurately modelled as DEM resolution increases with better agreement between simulation and observation in terms of flood occurrence time and water depth. The incorporation of UAV and VGI lower the barrier of sophisticated CFS and shows great potential in flood impact and loss assessment in urban areas.

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.

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