博碩士論文 101322058 完整後設資料紀錄

DC 欄位 語言
DC.contributor土木工程學系zh_TW
DC.creator曾文毅zh_TW
DC.creatorWEN-I TSENGen_US
dc.date.accessioned2014-7-30T07:39:07Z
dc.date.available2014-7-30T07:39:07Z
dc.date.issued2014
dc.identifier.urihttp://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=101322058
dc.contributor.department土木工程學系zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract近年來因全球氣候變遷導致高降雨強度事件頻率增加,而高降雨強度事件容易引發邊坡崩塌、土石流等事件,對於民眾及基礎建設造成嚴重損失。本研究使用小尺度三維渠槽進行實驗,藉由改變輸砂濃度及基準水面觀察沖積扇(alluvial fans)形態之變化,並搭配相機及雷射光,對沖積扇縱剖面、橫剖面、平面堆積形態、等高線、頂積層(topset)及前積層(foreset)角度以及流速剖面進行分析與討論。 控制參數包括顆粒粒徑、平台積水深及輸砂濃度,此輸砂濃度以水沙比(n)表示,水沙比為水入流量(Q_W)與顆粒入流量(Q_S)兩項比值。研究結果顯示頂積層角度主要隨平台積水深或水沙比增加而減少,成反比之關係;前積層角度隨平台積水深或水沙比增加而增加,成正比之關係。在有積水深實驗條件下,沖積扇形態明顯會因水體阻力而限制其堆積範圍;縱剖面形態會隨著平台積水深或水沙比增加而偏向於直線;橫剖面形態則是依不同斷面位置有所不同。但隨著積水深增加各組沖積扇實驗形態相似性也隨之提高。 關鍵字:沖積扇、基準水面、頂積層坡度、輸砂濃度 zh_TW
dc.description.abstractThe depositional process of debris-flow fans is experimentally explored in this study. The fan slopes were controlled by particle sizes, sediment concentration(i.e., the ratio of sediment discharge (Q_S) to water discharge (Q_W)) and the base-level water depth. Both longitudinal and cross-sectional profiles of alluvial fans were simultaneously measured by using a digital camera, a reflection mirror and multi-laser settings. The top-set angles increases with the increasing sediment concentration, while decreases with the increasing base-level water depth. The longitudinal profile of the alluvial fan is concave when the base-level water is negligible. While the longitudinal profiles become linear, a milder slope for topset and a steeper one for the foreset, when the base-level water exists. The dimensionless cross-sectional profiles show self-similarity characteristics. Key words: alluvial fans, base level, top-set slope, sediment concentration. en_US
DC.subject沖積扇zh_TW
DC.subject基準水面zh_TW
DC.subject頂積層坡度zh_TW
DC.subject輸砂濃度zh_TW
DC.subjectalluvial fansen_US
DC.subjectbase levelen_US
DC.subjecttop-set slopeen_US
DC.subjectsediment concentrationen_US
DC.title不同輸砂濃度及基準水面條件下之沖積扇形態分析zh_TW
dc.language.isozh-TWzh-TW
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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