英文摘要 |
The self-contained type tide gauge has the sensor, logger, power supply and other required units sealed into one container. This type of gauge has been widely deployed into the sea for tide information gathering. This study analyzes the data collected by three gauges deployed at the Dongsha tide station. These three gauges were placed vertically on the same staff in a six-inch pipe. The sensor zero of each gauge is taped at the installation and also at the de-installation. Because the gauges were purchased in different years along with the project’s progress, the most recent calibration of the instrument pressure constants are not the same. They were calibrated in 2012, 2016, and 2019 respectively. From the average of observed tide with each gauge, it is found that there are 0.07 m and 0.02 m drifts with the gauges calibrated in 2012 and 2016. Observed from the correlation coefficients, the form of the tide collected with these two units is also moderately deformed. This study provides evidence on supporting the need for gauge calibration. In the depth conversion from seawater pressure, this study also found that the deviation between the simplified conversion equation and UNESCO (1983) equation reaches 0.0066m in the data processed. |