碩士 / 國立成功大學 / 測量及空間資訊學系碩博士班 / 100 / Global Positioning System (GPS) buoys have been demonstrated to collect sea level data effectively and economically. By comparing to tide gauge records, GPS buoys provide high-frequency oceanic signals with periods of a few seconds to a few minutes that cannot be detected from 6-minute tide gauge records. In the study, GPS buoys were used to measure sea level variations in Aping harbor, Tainan and to study meteotsunami and significant wave height (SWH). Since meteotsunami may be amplified by harbor resonance, two GPS buoys were deployed inside and outside the Aping harbor, respectively to investigate the relationship between the harbor resonance and the frequencies of meteotsunamis. Different softwares including GravNav, RTKLIB, P3 and GAMIT/GLOBK are used to process GPS buoy measurements using Differential GPS (DGPS) with an additional GPS receiver as a reference station on shore and Precise Point Positioning (PPP) technique with the precise ephemerides of the final product provided by International GNSS Service (IGS). In order to verify the processed results, we compare the processed results derived from different softwares with Aping tide gage records. Using 37 tidal periods to fit tide gauge records to obtain the ocean tide, the processed GPS buoy results after removing fitting ocean tide are used to study meteotsunami and SWH by the moving average. Wave heights are defined by the zero-up crossing and zero-down crossing methods and the mean wave height of the highest one-third of wave heights, called SWH, is calculated. The estimated SWH can be provided for guiding the coastal construction. Finally, oceanic signals of different frequencies including high frequency, middle frequency, and tidal components are acquired using GPS buoy derived sea level variations by Hilbert-Huang Transformation (HHT) and then are used to detect the phenomenon of meteotsunami.
| Identifer | oai:union.ndltd.org:TW/100NCKU5367015 |
| Date | January 2012 |
| Creators | Ruei-JingLin, 林芮菁 |
| Contributors | Chung-Yen Kuo, Chung-Yen Kuo, 郭重言, 曾宏正 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 112 |
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