碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 91 / In this thesis a sandy soil with d50 of 0.078mm was adopted in laboratory flume tests for investigating soil fluidization responses and overall suspended sediment concentration profiles in shallower depths. Both monochromatic wave and regular wave group conditions were generated and the resulting depth profiles of sediment concentration with 5 optical probes above and pore pressures with 5 transducers inside the bed were studied. Comparisons with previous experimental studies clearly show that under monochromatic waves and regular wave groups the present sandy seabed displayed typical fluidized responses termed as partially-initially fluidized, partially initially/continuously fluidized and continuously fluidized as defined in previous studies, respectively. Even in partial soil fluidization there were resonant pressure amplitude amplification and rapid mean pore pressure build-up, particularly in upper soil layer. In wave-group tests, step build-ups of the pore pressure typically illustrate that further fluidization usually occurred after the large wave actions in each group. It is found that soils with lower permeability and under steeper waves are more likely to be fluidized in the first run. In general, the depth profiles of suspended sediment concentration near above the fluidized beds approximate either a logarithmic law or an exponential law under the generated wave conditions.
| Identifer | oai:union.ndltd.org:TW/091NCKU5083005 |
| Date | January 2003 |
| Creators | Hung-Yu Lai, 賴宏祐 |
| Contributors | Shan-Hwei Ou, Shiaw-Yih Tzang, 歐善惠, 臧效義 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 122 |
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