頁籤選單縮合
題 名 | 陡坡卵礫石小型河川底床推移載量測之研究--以筏子溪為例=Developing a Device for Measuring Bedload Transport Rate in a Small Steep-slope Gravel-bed River--Tested in Fazih River as an Example |
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作 者 | 劉建榮; 許少華; 蘇宏仁; | 書刊名 | 臺灣水利 |
卷 期 | 58:2=230 2010.06[民99.06] |
頁 次 | 頁71-80 |
分類號 | 443.47 |
關鍵詞 | 卵礫石; 底床推移載; Gravel; Bedload; |
語 文 | 中文(Chinese) |
中文摘要 | 目前大部分的河道泥砂輸移監測與評估皆以懸浮載為主,底床推移載的估算部分大多利用經驗公式進行推估。過去極少研究針對現地之卵礫石底床推移載傳輸量進行量測研究,僅透過簡單的水文及地文條件並由公式推估所得之底床推移載泥砂傳輸量有可能與實際傳輸量相差甚遠,加上目前少有研究針對底床推移載的量測進行探討,故本研究透過自行研發的小型河川底床推移載採樣器,進行現地的卵礫石底床推移載於颱洪期間傳輸量的量測與分析。本研究於2008年9月辛樂克颱風期間於台中市筏子溪知高橋上游河床進行卵礫石底床推移載傳輸量的量測。並與經驗公式推估所得該流況下的底床推移載傳輸量比較後發現,儀器所收集到的底床推移載總傳輸量與沙莫夫經驗公式 (中水局,2007) 所得之傳輸量接近,表示該經驗公式可用於概估小型陡坡河川的卵礫石底床推移載傳輸量。此外,透過表面流速與水深方向流速剖面的迴歸關係,可用來推估收集到的底床推移載最大粒徑的啟動流速。 |
英文摘要 | In most literatures, suspended load was the major quantity to evaluate and monitor for sediment transport in rivers. Bedload was usually evaluated by empirical formulas and few studies focused on evaluation and measurement of bedload. It might have large difference to evaluate the real transport quantities of bedload only by empirical formulas based on simple hydraulic and physiographical information. An instrument was designed in this study to measure the gravel bedload transported during typhoons or floods in a small river. In September 2009, the instrument was used to measure the gravel bedload at the upstream riverbed of Zhi-Gao bridge of Fa-Zih River during typhoon Sinlaku. The transported rate of gravel bedload calculated form the quantities collected by the instrument were close to that calculated by empirical formulas (IIIaMOB, . N.). It meant that experiential equation could be used to estimate the sediment transport quantity of small river. The starting-moving velocity of the biggest size of the bedload trapped by the instrument during typhoon could be estimated by the relation between the surface velocity and vertical velocity profile. |
本系統中英文摘要資訊取自各篇刊載內容。