Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34699
標題: 草溝之水理實驗及設計
Hydraulic Experiments and Design in a Vegetated Channel
作者: 林羿丞
Lin, I-Cheng
關鍵字: flume test;渠槽試驗;grassed channel;植生渠道;曼寧粗糙係數
出版社: 水土保持學系所
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摘要: 
基於保護整體生態,排水設施應減少混凝土使用的比例,非主要排水設施更可以草溝取代,進而降低整體排水系統混凝土的使用量。為尋求合適之草溝鋪設排水設計,本研究以兩種土壤、三種草種及三種坡度進行渠槽實驗,擬針對草溝之水理設計進行分析、探討。經實驗結果推得理論解合理,由相對高度與流速之關係圖可看出:在土壤為黃壤及土壤為紅壤的狀況下,減緩流速效果皆以假儉草為最佳、百慕達草次之,最差者為類地毯草。
本研究經實驗、計算及比較後,發現不論草層為何種植生,現常用於估算流速之曼寧公式所求得之流速皆偏大,屬於高估的情況,顯示其應用於斷面設計時容易與真實情況有較大之差異。而許煜聖(2003)之理論解較接近實驗值,因此本研究進而以其理論解繪出三種草種於不同土壤與不同坡度時之相對高度與平均流速關係圖,並提供設計例和曼寧公式進行比較。

In order to protect the ecological system, the proportion of using concrete to construct drainage facilities should be reduced, and some non-major drainage facilities could be replaced with grassed channels. This experiment was executed with two kinds of soil, three kinds of grass and three kinds of channel''s slope to analyze the designs of grassed channel and to seek the best one. The results of this study fit in with the analytical solution of Shiu''s (2003). Relati/onships between the relative height and the mean velocity explain that the effect to slow the velocity down of Centipede grass is the best, that of Bermuda grass is the second, and that of Carpet grass (Broad leaf) is the worst whatever the bottom is yellow loam or red loam.
After the experiment, calculation and comparison, the velocity estimated by Manning''s formula is always larger than that obtained by other methods whatever the slope of channel or the vegetation is. It indicates that the design of drainage facilities by Manning''s formula is often different from the reality. The results of this experiment approach to the analytical solution of Shiu''s (2003). According to the solution of Shiu''s (2003), we plot the relationship between the relative height and the mean velocity for three kinds of grass under different soil and slope, and we provide the designing case to compare with the application of Manning''s formula.
URI: http://hdl.handle.net/11455/34699
其他識別: U0005-2408200822072200
Appears in Collections:水土保持學系

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