| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系 === 84 === ABSTRACT
The geometric similarity and development of debris-fan
werestudied by laboratory experiments. Fifty-two runs with
non-uniformsediment materials were performed in these
experimental studys. Experimental results showed that once the
debris flow entered a wide basin,it would spread out, deposit
quickly, and form a debris fan. Three topographic scales, the
length (Lc), width (Bm), and depth (Zo) of the debris fan were
used as characteristic parameters to analyze the similarity of
the debris-fan. The results of analysis showed that the debris
fan in a stable stage could be described by Gaussian function in
both ofthe lonitudinal and the cross section with distributive
coefficients CL and CT respectivly. The plain shape of the
debris-fan was also found to have the similarity which was
able to be described by a circular.
According to the results of the similarity analysis, the volume
of a debris-fan could be derived as V=K(Lc)(Bm)(Zo),
where K is a coefficient. Finally, the toporaphic scales,
the length (Lc), width (Bm) and depth (Zo) werealso studied and
discussed.
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