Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16252
標題: 卵礫石型河川之輸砂特性-以大甲溪下游為例
Sediment transport characteristics of gravel-bed streams-Case study of lower Da-Chia river
作者: 陳恩專
Chen, En-Chuan
關鍵字: maximum general scour depth;最大一般沖刷深度;bed material load;bed load;sediment transport formula;床砂載;推移載;輸砂公式
出版社: 土木工程學系所
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摘要: 
A series of field experiments were conducted to collect sediment discharges, scour depths and hydraulic data during Typhoons Kalmaegi, Fung-Wong, Sinlaku, Jangmi and Morakot ( ) at the Da-Chia River Highway Bridge and Houfeng Bridge. The main objectives are to increase our understanding of the variations of the sediment transport characteristics and to evaluate the suitability of the commonly used sediment transport and general scour formulas for the lower Da-Chia River after the Chi-Chi Earthquake.
The experimental results revealed that some of the high-flow hydraulic characteristics data are difficult to observe. Alternatively, the mean flow velocity and flow depth are calculated from the water surface velocity-mean velocity relationship, and the resistence equation (log-law), respectively, which were calibrated (including the representative roughness) using the data collecting during the low and medium flows. Based on the unit sediment discharges calculated from the commonly used formulas and the statistical analysis, the sediment transport formulas applicable to the gravel-bed Da-Chia River are recommended.
In addition, an empirical formula was developed for the prediction of the short-term maximum general scour depth induced by a flood based on the data collected in this study and those collected by Lu et al. (2003-2005) in the Cho-Shui River. The regression equation includes four independent varianbles, i.e. unit flow discharge, water surface slope, median sediment size and the standard deviation of the bed material. It was found that the maximum scour depths predicted by the formula developed in this study are closer to the measured values as compared to those predicted by Blench's (1969) formula. However, the available data are still limited. It is recommended to collect more reliable data to verify or revise the formula.

為瞭解大甲溪下游於中部集集大地震後之輸砂特性,並評估常用輸砂及一般沖刷公式之適用性,本研究乃於大甲溪公路橋與后豐大橋附近進行颱洪時期(卡玫基、鳳凰、辛樂克、薔蜜及莫拉克颱風, )之水理、輸砂觀測及沖刷試驗。
研究結果顯示,部分颱洪中高流量水理特性觀測不易,可藉由現有垂線中低流量實測垂線平均流速,配合阻力經驗公式,率定河段床砂糙率代表粒徑,進而推求垂線平均流速及水深。應用相關水力參數,將常用輸砂公式所推估之單寬床砂載進行比較與統計分析後,本研究初步提出較適用於大甲溪卵礫石型河川之床砂載輸砂公式。
此外,根據本研究試驗資料並配合盧昭堯等人(2003~2005)於濁水溪實測資料,經迴歸分析,獲得一包含單寬流量 、水面坡降 、中值粒徑 及粒徑分佈因子 之短期洪水最大一般沖刷深度經驗公式。經與Blench(1969)公式進行比較分析,發現本研究推導之經驗公式,其推估值較為合理,惟目前試驗資料有限,未來仍應積極收集國內陡坡天然河川資料,以供進一步之驗證或修正。
URI: http://hdl.handle.net/11455/16252
其他識別: U0005-2008201010464900
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