| Summary: | 碩士 === 國立臺灣大學 === 海洋研究所 === 96 === Waves causes ship’s motions. Therefore, wave motions will be reflected in bathymetry record when water sounding survey is conducted without any heave compensation. As a result, the quality of bathymetrical map may relies partially on the choice of transducer and the fittness of heave.
The word “ Heave” is used to express a vertical displacement with relative to from a mean level. In this thesis, if the transducer is not positioned at the location of the mass center of the ship, heave shall be combination of gravity motion of sea waves, and the
roll/pitch motions of the ship itself. Generally, the motion sensor/heave compensator are linked with bathymetry system to correct the heave motion caused by sea waves.
It indicated that whether or not the heave compensation is functionable, it can not depend purely on the heave compensation being installed when using a data logger. In
our experiment , when we define the parameters in a software according to the description in the manual careless, it would easily create problem doing heave
compensation.
In this thesis, when the motion senser was installed by the side of the survey boat in the Machu project, we need to calculate the heave values of every measurement at boat mass center, and replace them in the record. After that, the compensation can be fullfilled using the Hypack software,and error margin shall be within +/-5 cm at 25m of depth range. It is also proved that the location of mass center of the boat is determined with confidence.
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