陡坡明渠流研究

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Title:	陡坡明渠流研究
Other Titles:	Analysis of Open-Channel Chute Flow
Authors:	許中杰
Contributors:	淡江大學水資源及環境工程學系
Keywords:	明渠;陡坡渠道;含氣水流;白水;深度平均含氣率;Open channel;Chute flow self-aerated flow;White water;Depth-averaged airconcentration
Date:	1995
Issue Date:	2009-03-16 16:55:53 (UTC+8)
Abstract:	水庫集水區上游或都市週邊山坡地之開發必須興築底床陡峻之渠道以收集漫地水流.由於此類陡坡渠流之含氣水流異於一般渠流之水理,其水理無法應用一般經驗式模擬而形成設計之無所依據.陡坡渠道之出水高若設計失當而不足,則可能使水體溢出渠道外形成自然土溝,其嚴重者將引起土壤之沖刷,更造成水庫或都市下水道系統之泥沙淤積.本研究擬進行底床坡度小於30度時,陡坡渠道之流況及其含氣率之物理模型實驗.應用定溫式熱膜流速儀並採用本人之量測方法而決定氣泡含氣率及流速. 實驗流量取0.003、0.006及0.009cms三組,而流槽之底床坡度為15、20、25及30度,並於底床上覆以塑膠地毯模擬糙度.根據試驗數據並應用因次分析而求得氣泡發展段與氣泡完全發展段之混合深度平均含氣率與福祿數、曼寧係數及坡度之關係.同時,推估白水起始點之水深與發生位置與水深雷諾數及坡度之關係經驗式.
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Research Paper

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