A decision support system for debris-flow hazard mitigation in towns based on numerical simulation: a case study at Dongchuan, Yunnan Province.
The hazard mitigation decision support system is an efficient method to avoid severe human damage by debris flow. Using modern technology, the multi-functional synthetical mitigation decision support system integrates debris flow monitoring, information transmission, disaster forecast and alarm, disaster estimate, evacuation and rescue plan to provide support for making mitigation strategic decision in all aspects before and after the disaster. The system was successfully utilised in debris flow hazard mitigation in the Dongchuan suburb in Yunnan Province. According to the data of monitoring and predicting, the system can simulate the movement of debris flow, and define the range and hazard zone of debris flow disaster. The result can be used to conduct disaster estimation, and prepare evacuation and rescue plan, which increases the degree of disaster mitigation. [ABSTRACT FROM AUTHOR]/nCopyright of International Journal of Risk Assessment & Management is the property of Inderscience Enterprises Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Mode /functions)l for the system:Outdoor monitoringData transmission modelData analysis modelStrategic decision model
This method involves complicated arithmetic, and needs to obtain all kinds ofphysical parameters of debris flow, such as bulk density, coefficient of viscosity, yield stress etc
In this paper, the scale of debris flow is determined for the purpose of prediction, and the movement is numerically simulated and the risk zone is drawn.
Accuracy of numerical simulation of debris flow movement and precision of debris flow forecast are two important factors to determine the disaster mitigation effect of the system.
It is necessary to set up the disaster-reduction auxiliary systemas an effective measure to avoid the heavy casualties caused by the debris flow with imperial scale.As the forecast function fails to work, the disaster warning will play a role and avoid the heavy casualties caused by the debris flow disaster
Numerical simulation of debris flow movement includes hydrodynamic method and phenomenal modelling method
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