Method for reconstructing full-depth sound velocity profile by combining WOA2018 model and actually measured thermohaline data

Abstract

The invention relates to a method for reconstructing a full-depth sound velocity profile by combining a WOA2018 model and actually measured thermohaline data. The method is characterized by comprisingthe following steps of: dividing water depth into two parts, namely a part within an effective measurement depth and a part outside the effective measurement depth, by taking effective measurement depths of XCTD and CTD actually measured thermohaline data as boundaries; within the effective measurement depth, adopting an actually measured temperature profile and an actually measured salinity profile; outside the effective measurement depth, revising the WOA2018 model outside the effective measurement depth by combining the data at the effective measurement depth, and constructing a full-depthand high-precision temperature profile and a full-depth and high-precision salinity profile; and calculating a full-depth and high-precision sound velocity profile by using the obtained full-depth and high-precision temperature profile and salinity profile. According to the method, the quality problem of the submarine topography measurement result caused by the sound velocity profile defect in the conventional deep and far sea multi-beam water depth measurement can be solved, and the reliability of the deep and far sea multi-beam submarine topography measurement result is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of marine measurement, in particular to a method for reconstructing a full-depth sound velocity profile specially applied to a joint WOA2018 model and actual temperature-salinity data for carrying out multi-beam bathymetry in deep and open seas. Background technique [0002] To carry out multi-beam bathymetry, sound velocity profile measurement must be carried out at the same time. When carrying out comprehensive surveys in deep and open seas, in order to meet the needs of marine hydrographic surveys and marine surveying and mapping, especially multi-beam bathymetry, Expendable Conductivity-Temperature-Depth (XCTD) is usually launched in the way of navigation or Conductivity in the way of mooring. -Temperature-Depth (CTD) to measure the temperature and salinity of seawater, and then calculate the sound velocity profile. Affected by harsh operating conditions, operating time, and equipment performance at sea...

AI Technical Summary

Problems solved by technology

Affected by harsh operating conditions, operating time, and equipment performance at sea, it is often impossible to detect full-depth, high-precision sound velocity profiles when operating in deep seas

Although the historical temperature and salinity model can be used to query the full-depth temperature and salinity information at the same location as the measured temperature and salinity data, and then calculate the full-depth sound velocity profile, but due to the limitation of the temperature-salinity model's own space scale and time scale, the full-depth sound velocity There are large errors in the profile, which will bring quality problems to the multi-beam submarine topographic measurement results in the deep and open sea

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