Study on Inundation Flow Analysis Method in Densely Populated Urban Area on Alluvial Fan

Miura, Shin; Kawamura, Ikuo; Kimura, Ichirô; Miura, Atsuyoshi

doi:10.2208/jscejhe.67.i_979

Cited by 6 publications

(9 citation statements)

References 1 publication

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“…Meanwhile, we focus on investigating the characteristics of various models using simulated tsunami hazards rather than validation of the models with the tsunami including uncertainties. [5,6] and SPH [9]); 2-D NSWW: two-dimensional, high-resolution nonlinear shallow water wave model [22]; Constant-n: constant roughness model; Landuse-n: roughness map model [27]; Equivalent-n: equivalent roughness model [28,29]; Landuse-n/Topography: roughness map and topographic model [18][19][20]23,30]; Equivalent-n/Topography: equivalent roughness and topographic model [29]; Coastal-Forest: coastal forest model [31]; Flood: flood model [FDM: 34,35,FVM: 32,33]; PBM: proposed model based on porous body model. In the coastal forest, flood models and PBM, the Landuse-n is assumed to be the bottom friction.…”

Section: Investigation Of Characteristics Of Tsunami Hazards Simulatementioning

confidence: 99%

“…Meanwhile, the PBM is equivalent to the flood model proposed by Miura et al [34] and MLIT [35], wherein the porosity and the surface permeability are expressed using the following formula:…”

Section: Differences Between Conventional Porous-type Models and The mentioning

confidence: 99%

“…The area of focus is the town of Onagawa with Δx = 5 m, as shown in Figure 5a. We compare two roughness-type models (Landuse-n and Landusen/Topography) and three porous-type models (the coastal-forest, the flood models using Equation (24) [34,35] in section 4 and PBM). Manning's roughness coefficients corresponding to the land use conditions presented by Kotani et al [27], which are water bodies, buildings/houses and paved surfaces, are similarly applied to each of the five models.…”

Section: Initial Setup Of the Tsunami Simulationmentioning

confidence: 99%

“…• (Model 4) the equivalent roughness and topographic model (Equivalent-n/Topography model) [29], which is a hybrid model combining the Equivalent-n model with a topographical model. • (Model 5) the coastal-forest model [31] and • (Model 6) the flood model [32][33][34][35], which are porous-type models employed to reproduce the geometric effects of porous media.…”

Section: Introductionmentioning

confidence: 99%

“…The flood model (Model 6) introduced an isotropic unit porous media with a characteristic value of porosity in the fundamental differential equations, which correspond to Equations (1) and (2) in Section 2.1. The models by [34,35] use the value based on volume porosity of the cell mesh as the flow path area at edge of that in their process of discretization by FDM, enabling the anisotropy of flow to be numerically reproduce, wherein the building height effect is not considered. Sanders et al [33] derived an integral form of a porous-type model that can take anisotropy into consideration by combining the Reynolds transport theorem with the conservation within the cell mesh in the finite volume method (FVM).…”

Section: Introductionmentioning

confidence: 99%

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Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model

et al. 2018

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Abstract:To evaluate tsunami hazards with strong locality in urban areas, this study developed a novel tsunami inundation model based on nonlinear shallow water wave equations and a porous body model (PBM). By applying a kinematic boundary condition that includes both porosity and surface permeability of the porous medium, the proposed model could accurately incorporate geometric effects such as the flow anisotropy caused by the distributions of buildings. The proposed PBM demonstrated as good accuracy for the inundation heights around buildings near the coastline as with a conventional three-dimensional simulation with high resolution. In addition, the model showed its capability to reproduce a tsunami's essential behaviors in urban areas. In particular, the amplification effect of flow velocity along straight roads surrounded by buildings was reasonably reproduced. It can be expected that the present model can become a useful tool to accurately evaluate the tsunami risks in urban areas.

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Section: Investigation Of Characteristics Of Tsunami Hazards Simulatementioning

confidence: 99%

Section: Differences Between Conventional Porous-type Models and The mentioning

confidence: 99%

Section: Initial Setup Of the Tsunami Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model

et al. 2018

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Numerical analysis of flood with a double grid model

Morikawa

Kimura

2018

E3S Web Conf.

Self Cite

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The objective of this study is to verify the validity of a hyper grid type (double grid model) computational model, for calculating flood flows with inundations. Nowadays, detailed information of the bathymetry is available due to improved measurement techniques, such as LP data. However, the number of grid cells used in the computation is limited because of the limitation of computational infrastructures. A double grid approach based on the model proposed by Volp et. al.(2013) is employed to overcome this problem.This model directly uses the high resolution topographic data though the discretization of the governing equations are made on coarser grid. The computational results showed that the present numerical model can compute the large scale flood phenomena efficiently and accurately.

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Risk-Level Assessment of Small-Scale Mountain Streams Using a Digital Elevation Model

MORI,

SUGIYAMA,

SATOFUKA

et al. 2024

Journal of JSCE

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In recent years, rainfall intensity in Japan has shown an upward trend, and sediment inflow disasters caused by mountain streams are increasing in number. As there are a significantly large number of mountain streams along railway lines, considerable time and effort are spent on local surveys for identifying dangerous mountain streams. Additionally, as there are a variety of diverse factors such as terrain and different geological features that collectively determine the hazard posed by mountain streams, risk-level assessments are not consistent among technicians. Above all, the risk-level assessment of upstream areas located in positions widely separated from the railway tracks and dispersed over a wide area require a huge amount of time and effort, and there may be a large disparity among the assessments made by engineers. Therefore, in this paper, we describe a simple method of evaluating the risk level of mountain streams in upstream areas using uniform criteria, without requiring local surveys. In concrete terms, we developed a scoring sheet that could assess the risk level mainly using quantitative data from a digital evaluation model (DEM). Through numerous comparisons, it was shown that the evaluation obtained using the DEM-scoring table was almost the same as the evaluation provided by local surveys.

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Study on Inundation Flow Analysis Method in Densely Populated Urban Area on Alluvial Fan

Cited by 6 publications

References 1 publication

Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model

Development of a Tsunami Inundation Analysis Model for Urban Areas Using a Porous Body Model

Numerical analysis of flood with a double grid model

Risk-Level Assessment of Small-Scale Mountain Streams Using a Digital Elevation Model

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