碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 94 / This study investigates with flume experiments the influence of wave grouping parameters of irregular waves on fluidization response of a fine sandy seabed in shallow water. The measurements have shown that, in an initially fluidized response, the thickness of fluidized soil layers (df) and flow velocity spectrum at peak frequency decrease with decaying water waves in the down-stream direction. At a fixed location above a fluidized bed, flow velocities in both vertical and horizontal directions continue to change with the build-ups of excess pore pressure.
Among the wave group parameters, the SIWEH (Smooth Instantaneous Wave Energy History) of water surface waves are found to be associated with the stepped build-ups of excess pore pressure. In particularly on the rising stage of the highest wave in a group, the suspended sediment concentrations generally increase significantly. From initially fluidized responses, both the regressed lines of GFH (Grouping Factor of Height) of wave and the wave height are indicative of the critical index on fluidization. In particular GFH and GF (Groupiness Factor) are well correlated with df . The group factor in length (Run) of vertical velocity after fluidization correlates well with suspended sediment concentration, and plays an important role in suspended sediment concentrations. In addition, both the length parameter and the correlation coefficient between subsequent high waves γHH(1) are critical to the fluidized response
| Identifer | oai:union.ndltd.org:TW/094NCKU5083022 |
| Date | January 2006 |
| Creators | Po-So Huang, 黃柏壽 |
| Contributors | Shiaw-Yih Tzang, Shan-Hwei Ou, 臧效義, 歐善惠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 132 |
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