碩士 / 國立成功大學 / 水利及海洋工程學系碩博士班 / 92 / This paper is aimed to investigate the relationship between wave run-up over the seawall and the physical properties of outer-layer structure. To achieve this, a series of experimental tests were conducted. In these tests, a total of five types of porous material were disposed, respectively, on the surface of the seawall model, then wave run-up over the porous material were measured under various wave conditions. Two different seawall slopes were included, and five material thickness were adopted.
Based on experimental results, it is observed that wave run-up depends apparently on relative thickness of the porous material if the relative thickness is small than 0.2. The wave run-up decreases as relative thickness increases. However, if relative thickness becomes greater than 0.2, wave run-up would decrease no more. Therefore, it is realized that waves coming up a seawall consume their energy in the porous material only within a relative thickness of 0.2.
As for the porosity, it is indicated that the wave run-up decreases with increasing porosity, with wave run-up decreasing rate depending on relative water depth. As relative water depth decreases, the porosity would play a more important role on wave run-up over the seawall. Further, it is found that the coefficient of permeability is directly propotional to the porosity, therefore, the wave run-up also decreases as coefficient of permeability increases. Finally, formulas relating wave run-up to either porosity or permeability are suggested.
| Identifer | oai:union.ndltd.org:TW/092NCKU5083045 |
| Date | January 2004 |
| Creators | Tsung-Yi Lan, 藍聰義 |
| Contributors | Sheng-Wen Twu, 凃盛文 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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