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題名 | 陡坡河道橋墩局部沖刷之研究=Study on Local Scour around Bridge Pier on Steep Channel |
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作者 | 賴文正; | 書刊名 | 明志技術學院學報 |
卷期 | 33 2001.06[民90.06] |
頁次 | 頁235-246 |
分類號 | 441.816 |
關鍵詞 | 陡坡; 橋墩; 局部沖刷; Steep slope; Bridge pier; Local scour; |
語文 | 中文(Chinese) |
中文摘要 | 本研究主要在探討陡坡河道下不同直徑的橋墩位於非黏聚性的礫石河床中,承受 清水流況下所造成河床之局部沖刷。從渠槽試驗中的觀察並配合前人的研究可得知,橋墩周 圍處的沖刷主要由向下射流、馬蹄形渦流及束縮水流所構成。根據向下射流理論、束縮理論 及無因次分析配合渠槽試驗結果,經多變量迴歸分析可得一橋墩相對平衡沖刷方程式。 |
英文摘要 | This research mainly focused on the local scour around bridge pier under clear-water flow conditions. The circular piers with various diameters are located in non-cohesive gravel channel with steep slope. According to the flume tests performed in conjunction with previous researches, it is found that the local scour is caused mainly by downflow, horseshoe vortex and contracted flow. An equation of equilibrium relative scour depth around bridge pier is obtained by multivariable regression analysis, using the results of flume tests and downflow and contracted flow theory as well as dimensional analysis. |
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