Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/93682
標題: The Effect of Free Over-fall by Upstream and Downstream Channel Bed Slopes on Impact Position
投潭水沖擊位置受制上下游渠床坡度影響之探討
作者: Jie-Hui Huang
Chun-Hsien Hsieh
Jen-Yan Chen
黃劼暉
謝俊賢
陳正炎
關鍵字: Impact position
channel bed slopes
free over-fall
沖擊位置
渠床坡度
投潭水
摘要: Most Taiwanese rivers are rapid and steep, with a large capacity for vertical erosion. Hydraulic structures that cross rivers, such as drop structures, check dams and weirs, are widely used to decrease flood erosion, to stabilize riverbeds, to protect structures that cross rivers and to provide public water and irrigation. The hydraulic structures make the upstream channel stable and sediments cannot be transported downstream so they remain in front of the riverbed of drop structures on the other side. These structures usually induce a change in the upstream slope and the super critical flow condition, which produces a large impact force downstream and destroys energy dissipating structures. This paper studies the impact location for different upstream and downstream channel bed slopes and compares a theoretical analysis and experimental results.
台灣河道大多坡陡流急,縱向沖刷能力大,為達消減洪水沖刷能力,達到穩定河床,保護跨河、防洪構造物安全及取水供民生、灌溉之目的,設置跌流工、防砂壩或攔河堰等橫向構造物為慣常使用之方法。雖可穩定上游河道,卻因砂石無法向下運送,而淤積於跌水工前河道渠床,導致跌水工上游渠床產生坡度,使水流成超臨界流況沖擊下游渠床,亦是消能工最易受損之處。本研究主要係藉由理論推導與實驗比較,探討投潭水沖擊位置受制跌流工上下游坡度改變之影響。
URI: http://hdl.handle.net/11455/93682
Appears in Collections:第46卷 第04期

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