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題 名 | 河川一維延散係數之量測與研究=Measurement and Study of Riverine 1-D Dispersion Coefficient |
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作 者 | 鄭仙偉; 劉文聖; 李志勳; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 11:3 1999.09[民88.09] |
頁 次 | 頁511-519 |
分類號 | 443.64 |
關鍵詞 | 河川; 延散係數; 追蹤劑; 演算法; River; Dispersion coefficient; Tracer; Routing method; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以瞬間釋放追蹤劑實驗配合演算法,進行河川一維延散係數( K )之研 究。演算法係以下游取樣站之 C-t (濃度 - 時間)曲線、預估 K 值及斷面平均流速 U 值 為輸入值,而以更下游取樣站之 C-t 曲線為輸出,再比較取樣與演算之 C-t 曲線,即可得 最適當之 K 及 U 值。經比對各站 C-t 曲線之各種相關特性,求得筏子溪中游(臺中市段 )在實測流況下之 K 值在 5.0 ∼ 6.5m □ /s 之間。經與前人其他各法比較,除證實演算 法最為準確外,亦發現此值較 Fischer 半經驗式估計值小一個級次。此外,本文並建立量 測河川 K 值之程序,供水質模式使用者參考。 |
英文摘要 | In this study, concentration measurements of an instantaneous release of tracer (Rhodamine B) in a nature river were recorded, and a routing method was performed to quantify the longitudinal dispersion coefficient (K). In the routing method, the sampled C-t (concentration vs. time) curve at a downstream station, an estimated K, and an estimated cross-sectional averaged velocity (U) were treated as input data, while the simulated C-t curve at a further downstream station was obtained from the output. A pair of best estimated K and U could be obtained by comparing the output with the sampled C-t curve at the same station. Several characteristics, such as standard deviation, skewness coefficient, maximum concentration, arrival time of maximum concentration and relative area between two curves, of the simulated and the observed C-t curves were compared at several stations, and the K value at the observed reach of Far-Tsu river, Taichung, Taiwan, was found to be 5.0m □ /s ∼ 6.5m □ /s, which was less than 1/ 0 of the value predicted by Fischer's semi-empirical formula. It is concluded from the discussion that an accurate K value can be estimated by the routing method provided that the tracer test has been performed correctly. The procedure of the tracer test is given in this paper. |
本系統中英文摘要資訊取自各篇刊載內容。