CN-122021443-A - Time-varying ocean current compensation average sea surface transmission method based on ground rotation balance principle

CN122021443ACN 122021443 ACN122021443 ACN 122021443ACN-122021443-A

Abstract

The invention discloses a time-varying ocean current compensation average sea surface transmission method based on a ground rotation balance principle, belongs to the technical field of ocean mapping, solves the problem that the prior method lacks quantitative compensation means for ocean current dynamic response and cannot effectively correct asynchronous effects generated by the quantitative compensation means, the method comprises the steps of obtaining synchronous observation water level data of a transfer station A and a station B to be transferred in a target sea area, constructing a sea current quantification model, calculating sea surface height variation between adjacent grid points in the sea current quantification model, and adding a steady sea current contribution value and a time-varying sea current contribution value as correction terms into a synchronous correction method respectively to obtain a corrected average sea surface transfer formula; the invention realizes the accurate quantification and effective compensation of the influence of the time-varying sea current, considers not only steady sea current but also quantitative compensation for the time-varying sea current when determining the corrected average sea surface height difference, and ensures that the prediction of the sea surface height change is more in line with the actual ocean dynamics process.

Inventors

DENG YUNFEI
BAO JINGYANG
Ouyang yongzhong
XU JUN
Hong Lidan

Assignees

福建理工大学

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (6)

1. A time-varying ocean current compensation mean sea surface transfer method based on a ground-to-ground balance principle, the method comprising: S10, synchronously observing water level data of a transmission station A and a station B to be transmitted in a target sea area, wherein the time span of the transmission station A and the station B to be transmitted in the target sea area is not less than one month, and acquiring a high space-time resolution ocean current model of the target sea area; s20, constructing a sea flow quantification model based on a ground-to-balance principle, and calculating sea surface height variation between adjacent grid points in the sea flow quantification model; S30, determining a ocean current contribution value between the transfer station A and the station B to be transferred based on the sea surface altitude variation, and dividing the ocean current contribution value into a steady ocean current contribution value and a time-varying ocean current contribution value; And S40, acquiring a steady current contribution value and a time-varying current contribution value, respectively adding the steady current contribution value and the time-varying current contribution value as correction terms into a synchronous correction method to obtain a corrected average sea surface transfer formula, and determining a corrected average sea surface height difference based on the corrected average sea surface transfer formula.
2. The method for transferring time-varying ocean current compensation mean sea surface based on the ground-going balance principle of claim 1, wherein when the ocean current quantification model is built based on the ground-going balance principle, the ocean current quantification model is built based on a ground-going balance equation, and the ground-going balance equation is expressed as: In the formula (i), The Coriolis parameter is obtained from the rotation angular velocity of the earth and the latitude of the place, Is a longitude of the name of a person, Is the latitude of the person in question, Is the average radius of the earth.
3. The method for transferring time-varying ocean current compensation average sea surface based on the ground-to-ground balance principle as set forth in claim 2, wherein when calculating the sea surface height variation between adjacent grid points in the ocean current quantification model, the calculation formula of the sea surface height variation between adjacent grid points is: Wherein, the , Is the amount of height variation between adjacent grid points in the east and north directions of the target sea area, The total height variation between the two stations is calculated by accumulation, and the sea surface height difference caused by short-term sea current variation is the correction quantity transferred by the average sea surface.
4. The method for transferring the time-varying ocean current compensation average sea surface based on the ground balance principle according to claim 1, wherein when the ocean current contribution value is divided into a steady ocean current contribution value and a time-varying ocean current contribution value, the relationship between the short-term average sea surface and the long-term average sea surface of the transfer station A and the station B to be transferred in the target ocean area becomes: Wherein the method comprises the steps of In order to realize zero point difference of the water gauges of the transfer station A and the station B to be transferred, For a steady sea current contribution between the transfer station a and the station B to be transferred, A time-varying ocean current contribution value between the transfer station A and the station B to be transferred.
5. The method for transferring the time-varying ocean current compensation average sea surface based on the ground-to-balance principle as set forth in claim 4, wherein the steady ocean current contribution value and the time-varying ocean current contribution value between the transfer station A and the station B to be transferred are calculated by the following formulas: Wherein, the For a steady sea current contribution between the transfer station a and the station B to be transferred, A time-varying ocean current contribution value between the transfer station A and the station B to be transferred.
6. The method for time-varying ocean current compensation average sea surface transfer based on the ground balance principle of claim 1, wherein the corrected average sea surface transfer formula is expressed as: Wherein, the Representing the average sea level difference caused by steady sea currents between the transfer station A and the station B to be transferred, The long-term average sea surface heights of the transfer station A and the station B to be transferred are respectively, Representing the average sea level difference caused by time-varying sea currents between the transfer station a and the station B to be transferred.

Description

Time-varying ocean current compensation average sea surface transmission method based on ground rotation balance principle Technical Field The invention belongs to the technical field of ocean mapping, and particularly relates to a time-varying ocean current compensation average sea surface transmission method based on a ground-to-ground balance principle. Background Average sea surface transmission is one of key technologies in ocean mapping and ocean engineering, and the core aim is to calculate the average sea surface height of a short-term tide station for many years by knowing the data of the long-term tide station. The conventional synchronous correction method is used as a common average sea surface transmission method, and basically assumes that the height difference (i.e. short-term pitch level) between the short-term average sea surface and the long-term average sea surface of each tide station is equal during synchronous observation. However, in a practical marine environment, the existence of time-varying ocean currents can significantly affect the phase consistency of long-period tidal waves (such as the annual tidal wave Sa and the semi-annual tidal wave Ssa), leading to differences in short-term level between different sites, and thus breaking the basic assumption of the synchronous rectification method. While ground-to-ground balance is an important concept in ocean dynamics, it describes the balance relationship between the flow field and density field in the ocean under the action of earth's rotation and gravity, and in the ground-to-ground balance state, the horizontal pressure gradient force and coriolis force in the ocean are balanced with each other, so that a stable flow field is formed. This principle provides a theoretical basis for understanding and predicting the motion of the ocean currents and also provides the possibility to compensate the influence of the ocean currents on the average sea level transfer. However, the existing sea surface altitude transfer method based on the ground-to-ground balance principle mostly assumes that the sea current is static or slowly-changing, and cannot accurately process the influence of time-varying sea current on sea surface altitude transfer. In practice, this assumption tends to lead to large errors, especially in areas where the current is highly variable, such as near coastal areas, straits and ocean fronts. And the existing method lacks quantitative compensation means for the response of the ocean current dynamics, especially when the time-varying ocean current leads to obvious delay angle difference of long-period tide dividing between tide stations, the traditional method cannot effectively correct the asynchronous effect generated by the delay angle difference, and the applicability of the method in an ocean current crossing area is limited. In order to solve the problems, a time-varying ocean current compensation average sea surface transmission method based on the ground-to-ground balance principle is provided. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a time-varying ocean current compensation average sea surface transmission method based on a ground-to-ocean balance principle, which solves the problems that the prior method lacks quantitative compensation means for ocean current dynamic response, and the traditional method cannot effectively correct asynchronous effects generated by the slow angle difference of long-period moisture separation between tide stations when the time-varying ocean current is obvious, and limits the applicability of the method in cross ocean current areas. The invention is realized in such a way that a time-varying ocean current compensation average sea surface transmission method based on the ground-to-balance principle comprises the following steps: S10, synchronously observing water level data of a transmission station A and a station B to be transmitted in a target sea area, wherein the time span of the transmission station A and the station B to be transmitted in the target sea area is not less than one month, and acquiring a high space-time resolution ocean current model of the target sea area; s20, constructing a sea flow quantification model based on a ground-to-balance principle, and calculating sea surface height variation between adjacent grid points in the sea flow quantification model; S30, determining a ocean current contribution value between the transfer station A and the station B to be transferred based on the sea surface altitude variation, and dividing the ocean current contribution value into a steady ocean current contribution value and a time-varying ocean current contribution value; And S40, acquiring a steady current contribution value and a time-varying current contribution value, respectively adding the steady current contribution value and the time-varying current contribution value as correction terms into a synchronous correction m