An Experimental Study on the Configuration of the Debris-Flow Fan under the influence of Viscous Material

• Main Authors: Chang, Willy, 張衛立
• Other Authors: Shien Chjeng-Lun
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/79997642624839642766

碩士 === 國立成功大學 === 水利及海洋工程學系 === 86 === Five kinds of gravel with different distributive coefficients and two kindsof fine sand with different viscosity are used for examining the effect ofviscous material on the configuration of the debris-flow fan in this experi-mental. The rheological properties of visco us sediment-water mixtures of thedebris-flow were analyzed by using horizonal-rotational rheometer, made byBrookfield company in U.S.A.. Experimental results show that once the debris-flow entered a wide basin, it will spread out, deposit quickly, and from a debris fan. Three topographic scales, the length (LC),width (Bm) and depth( ZO)of the debris-flow fan were used as characteristic parameters to analyze the debris-flow fan. The results of analysis show that the debris-flow fan in a stable stage canbe described by Gaussian function in both of the longitudinal and cross sect-ion. The plain shape of the debris-flow fan is also found to have the similar-ity which is able to be described by a circular. Additionally, the configur-ation of the debris-flow fan are not only varied with the volume of viscousmaterial but also the rheological properties of viscous sediment-watermixtures. According to the results of the similarity, the volume of a debris-flow fan which sediment material is viscous can be derived as V=α．LC ．Bm ． ZO.