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標題: 砂質河段懸移床砂載之探討-以濁水溪下游為例
Suspended bed material load characteristics of sand-bed streams─Case study of lower Cho-Shui River
作者: 張浩肇
Chang, Hao-Chao
關鍵字: 變量流;unsteady flow;沖瀉載;床砂載;懸移床砂載濃度剖面;wash load;bed material load;sediment concentration profiles of the suspended bed material load
出版社: 土木工程學系所
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以採樣瓶直接觀測法搭配螺旋流速儀,於斷面主深槽沿垂向進行多點取樣,成功測得2011年南瑪都颱風、2012年610梅雨大水及泰利颱風等三場颱洪事件,觀測流量範圍為390~4,250 m^3/s。
由本研究結合曾彥儒 (2007)資料,依據懸砂垂向個別粒徑變異數分析,界定研究河段沖瀉載劃分粒徑為0.074 mm,並進而推導懸移床砂載底床參考濃度(Cva(SBML))及泥砂交換係數與水流動量係數比值(β=εs/εm)等經驗公式,以配合Chiu and Tung (2002)明渠流流速及Chiu et al. (2000)泥砂理論,迅即掌握洪水水流及懸砂濃度剖面,提升經驗公式之適用性,俾利防災科技及防洪規劃設計之應用。

A series of field experiment was conducted to collect sediment discharges and hydraulic data during typhoon and heavy storm seasons at the Tzu-Chiang bridge of the lower Cho-Shui River after the river incision. The main objectives were to analyse the characteristics of the suspended bed material load and hydraulics of the unsteady flow for the sand-bed river reach.
Three sets of sediment transport data were successfully collected during Typhoons Nanmadol (8/30/2011) and Talim (6/20/2012), and the rain storms of 6/12/2012 and 6/13/2012. The observed discharge ranges from 390 to 4,250 m^3/s . Point suspended sediment samples were collected using the direct observation method with a simple sediment collecting bottle and a propeller-type velocimeter along the verticals at the main channel.
In conjunetion of Tsang’s (2007) field data, the dividing sediment size between the wash load and the bed material load was found to be 0.074 mm by using the variance analysis of vertical suspended load concentration distribution of the coefficient of variation individual particle sizes. Empirical formulas were derived for the reference concentration of suspended bed material load(Cva(SBML))and the ratio of diffusion coefficients for sediment transfer and momentum (β=εs/εm)to be adopted by Chiu and Tung’s (2002) velocity theory and Chiu et al.’s (2000) sediment concentration profiles theory. The empirical formulas could be applied to facilitate disaster prevention technology and flood control design.
其他識別: U0005-2408201212273400
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