Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/89386
DC FieldValueLanguage
dc.contributor陳樹群zh_TW
dc.contributor.author陳葉宏zh_TW
dc.contributor.authorYe-Hong Chenen_US
dc.contributor.other水土保持學系所zh_TW
dc.date2015zh_TW
dc.date.accessioned2015-12-07T08:05:58Z-
dc.identifierU0005-0202201516443900zh_TW
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dc.identifier.urihttp://hdl.handle.net/11455/89386-
dc.description.abstract本研究探討植物在不同疏密程度情況下,植株彎曲後對於周圍流場與底床變化的特性,研究中設計渠槽定床試驗與渠槽動床試驗各別探討植株水理與地形沖淤特性。實驗配置方面,變更植株前後的距離以作為疏密程度的依據,試驗中用五個不同的間距。渠槽試驗的水流條件均使用低於底床粒徑的啟動流速。彎曲植株為人工製模型,使用塑膠管彎曲成90度模擬倒伏的植株莖幹,尾端插入塑膠片模擬植株葉片。流場特性量測儀器使用超音波流速剖面量測儀(Ultrasound Velocity Profiler),量測植株倒伏後對周圍的流速影響與紊流強度,並觀察不同密度下的流場特性;動床沖淤試驗為擬實際植株群分布,將數個倒伏植株埋入10cm石英砂中模擬植株群,並用平行與交錯兩種排列方式,三種密度來進行試驗。試驗過程與結果分別使用縮時攝影機與雷射測距儀紀錄歷程與量化床面地形,並針對特定點位使用UVP量測水理特性,以利床面型態分析之依據。 根據植株密度、倒伏行為與流場試驗、地形沖淤結果交叉分析後,密度較小的植株倒伏過後,植株群中存在空隙區域,水流於此區域發生擾動,產生向上的射流與向下的掃流,Z方向有著較大的紊流強度,Y方向則有二次橫向流的產生,由於紊流強度明顯強烈,此特性使植株群內有下淘的傾向,每個植株沖刷坑深度相近;密度較大的植株,植株倒伏引導上方水流加速送往下游,葉片重疊蓋住下游植株,葉片表面形成一護甲層,水流於此減緩且不易朝倒伏植株下方移動,避免水流直擊底床,故底床受到保護,植株群內的沖刷坑深度可減緩60%以上,總床砂體積變化百分比也相對密度小的植株群小。zh_TW
dc.description.abstractThe study investigated the effects of bending vegetation in different canopy density on distribution of flow field and topography of bed. A fixed bed channel experiment and a movable bed experiment were de-signed for studying flow characteristics and topography of bed, respec-tively. In experiments, canopy density depended on a longitudinal dis-tance between two bending plants by five types. Flow condition in ex-periments was below the threshold velocity of sediment. A bending plant was composed of plastic pipe regarded to stem and P.P.C. film re-garded to blades. The study used Ultrasound Velocity Profiler (UVP) to measure flow field and turbulence intensity around bending vegetation in different density. In movable bed, bending vegetation in three types of density was placed in 10cm quartz sand in channel. Additionally, vegetation arrangement divided into parallel and staggered pattern. The development of topography was recorded by camera and the results of bedform were measured by the laser distance meter. After experiments, the relation between flow characteristics and topography was analyzed in bending vegetation of different density. The results showed that interval zones existed strong turbulence, up-ward flow and transverse flow in sparse canopy that was bent by flow. Strong turbulence and vertical flow in interval zones caused depression inside bending sparse vegetation. In contrast, plant bent and covered other plant in dense canopy. A shear boundary was induced in the sur-face of bending vegetation. Consequently, the shear boundary avoided flow flowing toward bed and reduced the flow velocity. The depth of erosion inside dense canopy could reduce up to 60%. The significant result occurred due to covering motion with bending vegetation pre-vented bed from flow and bending blades made flow downstream quickly. Total volume of scour and deposition in bending sparse canopy was higher than dense ones.en_US
dc.description.tableofcontents摘要 I Abstract III 目錄 V 圖目錄 VIII 第一章 緒論 1 1.1 研究動機與目的 1 1.2 研究方法 3 1.3 本文組織 4 第二章 文獻回顧 5 2.1 紊流混合層特性 5 2.2 植生擺盪與流場之特性 6 2.3 植物倒伏特性 9 2.4 植生群之紊流與泥沙沖淤特性 11 2.5 UVP應用流場量測 18 第三章 實驗設計與流程 21 3.1 試驗渠槽 21 3.2 定床流場試驗配置與流程 24 3.2.1 模擬植株 24 3.2.2 密度 24 3.2.3 床砂條件 25 3.2.4 水流條件 26 3.2.5 試驗儀器與量測區位 26 3.2.6 試驗流程 30 3.2.7 試驗基本假設與條件 31 3.3 動床沖淤試驗配置與流程 31 3.3.1 植株群配置 31 3.3.2 床砂條件 32 3.3.3 水流條件 32 3.3.4 試驗儀器與量測區位 33 3.3.5 試驗流程 36 3.3.6 試驗基本假設 37 第四章 定床流場試驗結果 38 4.1 X-Z平面u流速剖面 38 4.2 X-Y平面v流速高程 41 4.3 X-Z平面w流速等高線分布圖 44 4.4 X-Z平面X方向紊流強度分析 48 4.5 X-Y平面Y方向紊流強度分析 53 4.6 X-Y平面Z方向紊流強度分析 57 第五章 動床地形沖淤試驗結果 63 5.1 沖蝕歷程 63 5.1.1 平行排列的倒伏植株群 63 5.1.2 交錯排列的倒伏植株群 66 5.2 床面型態分析 68 5.2.1 平行排列的倒伏植株群 68 5.2.2 交錯排列的倒伏植株群 72 5.3 水理分析 75 5.3.1 X方向流速與紊流強度 75 5.3.2 Z方向流速與紊流強度 81 5.4 探討倒伏植株群、流場機制與床砂變化之關係 86 第六章 結論 90 第七章 參考文獻 91zh_TW
dc.language.isozh_TWzh_TW
dc.rights同意授權瀏覽/列印電子全文服務,2018-02-04起公開。zh_TW
dc.subject倒伏植株zh_TW
dc.subject沖淤特性zh_TW
dc.subject流場特性zh_TW
dc.subject植株密度zh_TW
dc.subjectbending vegetationen_US
dc.subjecttopographyen_US
dc.subjectflow characteristicsen_US
dc.subjectcanopy densityen_US
dc.titleHydraulic Mechanics and Topography of Bending Vegetation in different Densityen_US
dc.title倒伏植株群的疏密型態對於水理機制與沖淤特性影響之探討zh_TW
dc.typeThesis and Dissertationen_US
dc.date.paperformatopenaccess2018-02-04zh_TW
dc.date.openaccess2018-02-04-
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