碩士 / 國立交通大學 / 土木工程學系 / 100 / This paper presents a new definition of tide type, period ratio (PR), to indicate three tide types using K-means method. That PR is lower than 0.55 shows semidiurnal tide and that PR exceeds 0.80 indicates diurnal tide. PR between 0.55 and 0.80 shows mixed tide. Relative standard deviation (STD) of PR within a range of 2% slightly varies for three annual tidal data sets at one of seven locations around Taiwan. However Due to a mount of data missing in 2006 Danshui and Lanyu the relative STD reach 6% and 3%, respectively. The PR at Chengkung reach 6% for annual variation of tides. Different seasonal and semiannual data lengths are examined for the variation of PR. The result shows that the PRs at Lanyu, Chengkung, Keelung and Kaohsiung vary too much to show the same tide type. PRs for different data length of diurnal and mixed tides have larger variation than those of semidiurnal tide. Maximum STD of PRs of semidiurnal tide is 4% and that of mixed tide is 14% .
Other two indicators (TP and TR) for tide types are obtained from two parameters of normal distribution fitting for the tidal ranges and the periods of individual tide Lower and upper indexes of TR separating semidiurnal, mixed and diurnal tides are 0.15 and 0.30. Lower and upper indexes of TP separating semidiurnal, mixed and diurnal tides are 0.23 and 0.29.
| Identifer | oai:union.ndltd.org:TW/100NCTU5015072 |
| Date | January 2012 |
| Creators | Li, Ming-Hsien, 李明憲 |
| Contributors | Chang, Hsien-Kuo, 張憲國 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 44 |
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