Abstract
Sound velocity measurement is an important part of multi-beam sounding, and its accuracy directly affects the coordinate reduction of sounding points. Because of the variability of seawater sound velocity in time and space, the layout density of acoustic section stations directly affects the accuracy of multi-beam sounding. Over-dense layout wastes resources and causes inefficiency; over-sparse layout is not accurate enough to control the entire survey area. Based on the constant gradient acoustic ray tracing algorithm, this paper constructs the accuracy evaluation model of the weakest water depth point of acoustic profile station control, and analyses whether the existing multi-beam acoustic profile station layout scheme can satisfy the accuracy requirements of multi-beam sounding through an example calculation, which provides a theoretical basis for adjusting the layout scheme of acoustic profile station for field surveyors.
Highlights
Sound velocity distribution is a very important parameter in the field of underwater acoustics in the marine environment [1]
Significant changes in temperature and Salinity Characteristics of seawater media will inevitably lead to spatial and temporal changes in sound velocity structure, which will have a significant impact on multi-beam seabed exploration [2]
Multi-beam measurement is strongly dependent on sound velocity structure
Summary
Sound velocity distribution is a very important parameter in the field of underwater acoustics in the marine environment [1]. In the course of multi-beam measurement, because of the variability of sound velocity profile in time and space, in principle, the more and more sound velocity profile stations, the more accurate they are. In order to satisfy the accuracy, and taking into account the variability of time and space of sound velocity profile, Sound velocity profiles are usually measured over a certain time and space span. The basic principle of its layout is: on the premise of satisfying the accuracy requirement of multi-beam sound velocity correction, the measurement area control of sound velocity profile can be realized with the smallest sampling station [5]. According to the standard of velocity profile point layout, the reason of whether sound profile station should be installed is given, which can guide field surveyors to survey
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