Abstract
In this paper, an innovative profiler driven by tidal energy for long-term oceanographic measurements in offshore areas with abundant tidal resources is investigated. The profiler is mainly composed of an oceanographic data collection system equipped with various sensors and a cross-plate that can make an upward or downward movement under the impact of tidal currents. Theoretical research is carried out through static analysis and numerical simulation, mainly studying the hydrodynamic characteristics of the cross-plate and its dynamic response to the current velocity. The theoretical model is verified by comparison with experiments. The research results show that tidal energy can be used as a kind of energy to drive the profiler’s ascent and descent motion and to continuously measure ocean parameters without using electric energy. The theoretical model established in this study can roughly predict the position of the profiler observation platform in the vertical direction under various current velocities. Furthermore, by studying the relationship between the current velocities and the lift and drag forces of the cross-plate in the fluid, it is recognized that the current velocity is an important factor affecting the stability of the system’s motion. It is hoped that this research will contribute to the development of profilers.
Highlights
In this paper, an innovative profiler driven by tidal energy for long-term oceanographic measurements in offshore areas with abundant tidal resources is investigated
The force of the cross-plate was calculated by numerical simulation to make up for the shortcomings of static force analysis, that is, numerical simulation is only make up for the shortcomings of static force analysis, that is, numerical simulation is only an auxiliary tool, and the theoretical results obtained by the combination of the two are an auxiliary tool, and the theoretical results obtained by the combination of the two are compared with the results of the flume experiment
This study shows that the tidal currents can drive the ups and downs of the observation platform on the profiler when driving the cross-plate to rise and fall, to achieve continuous recording and measurement of ocean profile parameters
Summary
An innovative profiler driven by tidal energy for long-term oceanographic measurements in offshore areas with abundant tidal resources is investigated. Theoretical research is carried out through static analysis and numerical simulation, mainly studying the hydrodynamic characteristics of the cross-plate and its dynamic response to the current velocity. The theoretical model established in this study can roughly predict the position of the profiler observation platform in the vertical direction under various current velocities. It has been well recognized that the long-term, autonomous, reliable and affordable vertical profile measurements of seawater parameters in specific areas highly contribute to oceanographic research, climate prediction, and disaster prevention. One of the methods is to use ship-borne devices of most oceanographic vessels. These onboard instruments require winches to complete the measurements, which is fairly labor-intensive and requires a staggering amount of financial resources
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