碩士 / 國立成功大學 / 水利及海洋工程學系 / 88 / When the large floods coming , bridge which become partially or totally submerged are subject to pressure-flow scour. Under this flow condition , a good deal of floatage such as Eichornia Crassipes often float under the water near bridge deck . Its movement and effect on pressurized flow pattern will be discussed.
The experiments were conducted to study the flow field , discharge , and water level at the bridge deck under the pressurized flow condition which Eichornia Crassipes float under the water . The experimental data were all recorded , it were compared with Chang’s data(1999). The velocity data were also compared with the log-law velocity distribution to predict the fore influence region(FIR) and behind influence region(BIR).
With the discharge changed , Eichornia Crassipes float under the water near bridge deck can be divided into three patterns . The experimental data were substituted into energy equation and continuity equation to caculate energy loss and energy loss coefficient. Compared with the energy loss of three patterns , the first pattern which Eichornia Crassipes float under water before bridge deck had the most energy loss.
| Identifer | oai:union.ndltd.org:TW/088NCKU0083015 |
| Date | January 2000 |
| Creators | YA-YU TSAI, 蔡亞佑 |
| Contributors | JAN-MOU LEU, CHAN-JI LAI, 呂珍謀, 賴泉基 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 71 |
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