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 Methodological
Research on Numerical Simulation and
Disaster Risk Assessment of Debris Flow Deposition Fan
泥石流堆积数值模拟及泥石流灾害风险评估方法 In Chinese
By Luo Yuanhua & Chen Chongxi
Published in 2000
Page: 82 pages
Size: 185x260mm, paperback
Price: US$15
This monograph focuses its research on the advanced areas of numerical
simulation and disaster risk assessment of debris flow deposition fan.
On the bases of its research achievements, a systematic methodology has
been established for the assessment of disaster risk of debris flow deposition
fan.
With respect to numerical simulation of debris flow deposition fan, the
previous studies has been reviewed in this book. Set up the mathematics
model with describing the process of two-dimensional debris flow, authors
develop the contimuity equation by the law of conservation of mass and
establishe the momentum equations by the law of conservation of momentum.
The authors make good use of the advanced computer technologies, establishe
the finite difference equation of numerical simulation by the differential
operator fission method, and write programs for computers which contact
friendly with the other programs. The parameters are directly input on
the keyboard. The numerical simulation process is correct and stable.
The whole programs can be used commonly and be expanded easily. Comparing
with the results of the laboratory experiment and the data observed in
the field, the results of numerical simulation are identical. The deposition
process by numerical simulation is in keeping with the law of debris flow
movement.
With respect to the disaster risk assessment of debris flow deposition
fan, the authors promote their main ideas by summarizing and analyzing
the relevant techniques and methods for its assessment. On the bases of
a research on the preconditions of debris flow deposition fan and allocation
of the disaster areas, the authors lay their foundation on the assessment
of the degree of danger, regards the assessment of injured degree as the
main part of his research and the assessment of disaster loss and efficiency
in preventing and reducing the disaster as its research findings. Finally,
some proposals for the decision maker are putforword. According to the
findings of numerical simulation and with the example of Nilagu river
in Dongchuan city of Yunnan Province, the author promotes the concept
of danger and injured degree and its calculating methods in assessing
the degree of disaster, which can be used directly in assessing and estimating
the losses on the debris flow deposition fan when a certain degree of
debris flow disaster is coming.
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