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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/68025

    Title: 顆粒特性及水流條件對顆粒體運動及 淤積型態之實驗研究
    Authors: 吳侑謙;Wu,You-cian
    Contributors: 土木工程學系
    Keywords: 沖積扇;基準水位;前積層坡度;頂積層坡度;Alluvial fan;Base-level water depths;topset slope;foreset slope
    Date: 2015-07-29
    Issue Date: 2015-09-23 10:12:49 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 全球氣候變遷影響下,極端的氣候事件增加,高強度降雨所造成之災情變的更加嚴重且頻繁,土石流與洪流事件也隨之增加。台灣山麓沖積扇經常成為各村莊、部落的聚集地。若產生土石流災害,對人民生命安全及財產的損失將造成嚴重的威脅。本實驗利用小尺度的三維渠槽,搭配雷射光與相機進行研究,並於流量率定時探討桶倉(silo)內粒流動之情形,再藉由改變水砂比(n)以及積水深度對沖積扇(alluvial fans)型態之縱剖面、橫剖面、扇緣堆積形態以及頂積層(topset)與前積層(foreset)角度進行分析及探討。

    ;Under the impact of global climate change, the slope-land disasters such as landslides and flash floods caused by highly intensive rainfalls occur more frequently. Alluvial fans at foothills in Taiwan often accommodate villages and infrastructures, and are high-risk areas for the landslides and debris flows. In this study, the formation for alluvial fans is explored by using experimental study. A small-scale flume-basin model was setup with silo, laser lights and camera to investigate the fan forming processes. By changing the sediment concentration (i.e., the ratio of sediment discharge(Qs)to water discharge (QW)) and the base-level water depths, the longitudinal profiles, cross profiles, fan shapes, angles of topset and foreset angle have been analyzed. The size of the silo opening and particle size control the particle discharge. The longitudinal profiles of the fans depict a concave shape, while the lateral profiles are convex. The angles of topset slope decrease with decreasing sediment concentration, while the foreset slopes with tail water are close to the friction angle of the sediment.
    Appears in Collections:[土木工程研究所] 博碩士論文

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