EXPERIMENTAL AND NUMERICAL STUDIES ON THE MORPHOLOGICAL SIMILARITY OF DEBRIS-FLOW FANS

摘要

The morphological similarity of debris-flow fans is found in this study by using a series of laboratory experiments and numerical simulations. The length of the center line(Lc), maximum width(Bm) and thickness of the apex point(Zo) of debris-flow fans are adopted as the characteristic parameters to analyze the morphological similarity of the debris-flow fans in this study. The experimental and numerical results showed that the non-dimensional longitudinal and cross sectional profiles of debris-flow fans in the "stable stage" can be described by Gaussian functions, while the non-dimensional plan form of the debris-flow fans is well fitted by a circular curve. By combining the three non-dimensional curves mentioned above, the total volume and the 3-D morphological function of debris-flow fans can be easily derived.