| Summary: | 碩士 === 逢甲大學 === 土木及水利工程研究所 === 89 === Basing on landslide outbreak model and riverbank stability analysis, this paper infers the mechanism of landslide that triggers debris flow, and uses flume experiments to prove this theory. The study shows that debris flow triggered by riverbed degradation and lateral landslide occurrence model is different than the previous model neglecting riverbank influence, which only considers riverbed scouring. From data analysis, we conclude the below results:
1.The minimum sediment concentration of debris flow ( ) and critical channel slope ( ) are two major parameters providing a quantitative classification on debris flow and distinguishing the difference between debris flow and sediment-laden flow.
2.We established the equivalent debris flow sediment concentration formula.
3. By correlating two major parameters, debris flow relative occurrence ratio ( ) and sediment outflow ratio ( ), to distinguish dangerous debris flow gullies. It says that when debris flow reoccurrence ratio minore to 70%, sediment outflow ratio over 80%, and danger rank is below 4, at this time the gully is more stabilized.
4.Through regression analysis we establish debris flow sediment discharge, debris flow discharge, and estimate debris flow sediment outflow ratio formula.
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