Program Overview
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Landslide and debris-avalanche occurs frequently in Japan due to its weak
geological formations and topography not to mention its steepness. Debris-avalanche
does more damage to the people than it does to the land itself. In fact,
the scale of damage it can cause is extremely large.
One of the effective hard measures to prevent or mitigate the damage that a debris-avalanche can cause is building a check dam. The soft measures are establishing means of information transmission or an organized warning and evacuation system that provides simultaneous announcement to all the residents at risk telling them to evacuate immediately. Other soft measures include regulating the relocation of houses to the areas prone to the disaster and relocating the existing houses to a safer place.
The UC-win/Road Debris-Avalanche Simulation plug-in links the UC-1 Debris-Avalanche Simulation, a solution with an ability to run a debris-avalanche analysis through
a series of process, and 3D Visual Interactive Simulation & Modeling
software UC-win/Road for creating the input data to be analyzed and visualizing
the analysis results within the UC-win/Road 3D VR environment. The UC-1
Debris-Avalanche Simulation uses "Debris-Avalanche Simulator (Kanako)"
developed in the Graduate School of Agriculture, Kyoto University, as a
solver. FORUM8 has built the robust function that pre-processes and post-processes
the data to be analyzed so that a debris-avalanche analysis can be run
effectively in a series of process while incorporating the solver, and
that' s how this intelligent solution named UC-1 Debris-Avalanche Simulation
came to be. The structure and work flow of the system are illustrated below.
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Flow of the debris flow simulation |
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■ New Product Introduction
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UC-win/Road Debris-Avalanche Simulation plug-in
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Overview
This plugin enables the export of 1 dimensional and 2 dimensional region (terrain) subject to an analysis by the UC-1 Debris-Avalanche Simulation, from the UC-win/Road model. The UC-1 Debris-Avalanche Simulation imports this area for the analysis, and from there on the user can assign several critical conditions to allow simulation to take place.
Furthermore, the result analyzed in the aforementioned software can be imported to UC-win/Road using this plug-in for a time-history representation of the approaching debris-avalanche within the 3D VR environment allowing users to visually confirm how sand, mud, and debris travel over time. This system that accurately visualizes the debris-avalanche is not only an effective tool for validating the proposed measures for preventing or mitigating the damage likely to be inflicted by a debris-avalanche, but is also a powerful tool capable of building a risk awareness model that would help the residents to better understand the risk and the actual situation in an event of a large debris-avalanche.
Feature
This product runs as a plug-in of UC-win/Road and is equipped with the
2 functions below that have been developed by using the engine of mudslide
simulator "Kanako" as a reference.
Auto calculation of river
As for model creations of the debris avalanche (Kanako), it is necessary
to enter the river where debris avalanches flow in, and a function to automatically
calculate most suitable river shape from the UC-win/Road terrain data has
been added in this revision. The model can now be created almost automatically.
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 Getting river shapes from the UC-win/Road terrain data |
High speed drawing support
Drawing speed has been greatly improved in this version. This improvement
made it easier to perform a simulation in parallel to rain or drive simulation.
For reference, drawing speed became about three times faster for our simulation
data for 30 minutes.
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Enhancing of drawing speed
makes simulations more efficient. |
Entering of river shape by keyboard
River shape can now be decided by using a keyboard. A paste function is
also available so that you can paste information from documents. Input
of degrees, minutes, and seconds are also supported.
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| Fig.4 Editing river shape with keyboard |
Addition of sound expressions
A function to play sounds in accordance with the debris flow simulation
has been added, supporting the wav file format. Sound makes simulations
more real.
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| Fig.5 Sounds selected in the setting screen are played. |
Export function
The region that you wish to analyze can be specified by simply clicking the said region within the UC-win/Road terrain data.
The terrain data input process has been automated so that time and effort
can be greatly saved.
Visualization function
The result analyzed via Debris-Avalanche Simulator can be visualized using UC-win/Road.
The flow of debris-avalanche and the effected region can be visually understood, making the system a great presentation tool.
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| Exporting data |
Visualizing data |
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| Obtaining the analyzed region from UC-win/Road |
Adding observation points and enclosing bund |
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| Drawing option |
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Visualizing the results of Debris-Avalanche analysis
(Left: Counter expression, Right: Approaching mudslide) |
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UC-1 Debris-Avalanche Simulation
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Overview
This program adopts the "Debris-Avalanche Simulator (Kanako)"
developed in the Graduate School of Agriculture, Kyoto University, as a
solver, and has the ability to run a debris-avalanche analysis effectively
in a series of process thanks to pre-processing and post-processing features
built into the program by FORUM8.
Feature
In order to take into account the effect of prediction on the damage that a debris-avalanche can do as well as the effect of physical barriers such as check dams have on the debris-avalanche, the calculation must be done on both the steep region (1 dimensional region) where the debris-avalanche originates and propagates and the low-angle alluvial fan (2 dimensional region) where the debris tend to overflow or pile up putting people and their houses within the area that risk. The "Debris-Avalanche Simulator (Kanako)", a solver that is used in this simulation, adopts the coupled model. How it works is that the steep region is calculated using the 1 dimensional model and the low-angle alluvial fan is calculated using the 2 dimensional model, and the result of each calculation interacts with one another at the entrance to the valley which is considered the boundary of the 2 region, allowing the system to integrate each calculation result in order to find the overall effect of the debris-avalanche prediction and measures.
The figure below is a window from the "Debris-Avalanche Simulator (Kanako)" showing the analysis result, which can also be displayed for visual confirmation through the UC-1 Debris-Avalanche Simulation.
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| Screen for 2D terrain via Kanako (Water depth is displayed.) |
For analyzed results, the following items can be visually confirmed.
- Water surface/ river-bed form
- Flow depth
- Deposition thickness
- Hydrograph of observation point
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| Main screen |
One-dimensional domain |
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| Two-dimensional domain |
Hydrograph of inflow |
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| Analysis result of flow depth |
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Applicable criteria and reference
- Takashi Wada, Yoshifumi Satofuka, Takahisa Mizuyama. Integration of 1-
and 2- dimensional models for debris flow simulation. In Journal of the
Japan Society of Erosion Control Engineering Vol.61, No.2, p.36-40, 2008.
- Kana Nakatani, Yoshifumi Satofuka, Takahisa Mizuyama. Development of "kanako
Ver.1.10", a wide use one dimensional debris flow simulator equipped
with GUI. In journal of the Japan Society of Erosion Control Engineering
Vol.61, No.2, p.41-46, 2008.
- Kana Nakatani, Takashi Wada, Yoshifumi Satofuka, Takahisa Mizuyama. DEVELOPMENT
OF AN USER FRIENDLY DEBRIS FLOW SIMULATOR EQUIPPED WITH GUI. In Proceedings
of the 4th symposium on sediment disasters, p.149-154，2008.
- Yoshifumi Satofuka, Takahisa Mizuyama. Numerical simulation on a debris
flow in a mountainous river with a Sabo dam. In journal of the Japan Society
of Erosion Control Engineering Vol.58, No.1, p.14-19, 2005.
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Debris Flow Plug-in Option Ver.2
