蜿蜒渠道床形沿時變動之試驗研究

本文以正弦衍生曲線之蜿蜒試驗渠道，床形由起始之平坦地形逐漸演變爲平衡地形，以探求床形之演變過程，期能更深入了解蜿蜒河道床形變動現象，此爲治理或利用此類河川之重要前題之一。由試驗結果得知，床形變動主要發生於灣道區。淤積以凸岸彎道區爲主，且隨時間很快達到穩定狀態。冲刷以凹岸彎道區為主，初期以彎道頂點及其下游之中央區域爲主要冲刷範圍，另於凹岸反曲點近岸區域亦產生一較小之冲刷區域，隨著時間增加冲刷深度及範圍逐漸增大，且兩冲刷區逐漸合一於彎道頂點略下游之近岸區域。

關鍵字

蜿蜒渠道；床形沿時變動

並列摘要

It shows that a great change of river bed happens in the bend. Most deposition appears in convex-bend zones, and quickly reaches stable state. Most scour happens in concave-bend zones, and it has two serious positions in early stage, one at center zones of bend apex nearby and its downstream, the other at zones of inflection of concave near-bank. Finally, the two of the main scours will be combined into one.

並列關鍵字

Meandering channel ； Bed variation

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