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Calculation method for calculating secondary partial tide experience cotidal chart based on relative admittance

A secondary and empirical technique, applied in the field of calculation of secondary tidal division empirical tidal maps based on relative admittance, can solve problems such as large errors in tidal maps

Inactive Publication Date: 2017-05-10
THE FIRST INST OF OCEANOGRAPHY SOA +1
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that there is a large error in the current tidal tidal distribution diagram

Method used

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  • Calculation method for calculating secondary partial tide experience cotidal chart based on relative admittance
  • Calculation method for calculating secondary partial tide experience cotidal chart based on relative admittance
  • Calculation method for calculating secondary partial tide experience cotidal chart based on relative admittance

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Embodiment Construction

[0064] The present invention will be described in detail below in conjunction with specific embodiments.

[0065] The present invention provides a calculation method based on relative admittance to calculate the secondary tidal empirical co-tide diagram, including the following calculation steps:

[0066] Step S1, for a certain main tidal current n, the admittance An is:

[0067]

[0068] in h n and g n are the corrected amplitude, amplitude and delay angle of the main tide, respectively, C n is the coefficient of tidal force (see Chen Zongyong, 1980 [25] ; Fang Guohong et al., 1986 [26] , Huang Zuke, Huang Lei, 2005 [27] );

[0069] Step S2, in the same tidal group, define the relative admittance of the minor tidal m relative to the major tidal n as:

[0070]

[0071] in,

[0072]

[0073] r m / n =g m -g n (4)

[0074] H in formula (3) m / H n is the amplitude ratio in traditional tidal science, g m -g n is the lag angle difference; if the amplitude ...

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Abstract

The invention discloses a calculation method for calculating a secondary partial tide experience cotidal chart based on relative admittance. For a certain main partial tide n, an amplitude Hm and an epoch gm of a secondary tide m are calculated through utilization of relative admittance Rm / n of the admittance An and a secondary partial tide m relative to the main partial tide n. According to the method, distribution of the relative admittance of a research sea area is obtained through utilization of harmonic constants (the amplitudes and the epochs) of coast tide stations; and the distribution of the secondary partial tides is obtained through utilization of the harmonic constants of the main partial tides in the sea area. A relative error of a detection result is effectively reduced, and the relatively high precision is achieved.

Description

technical field [0001] The invention relates to the field of marine monitoring, in particular to a method for calculating a secondary tidal empirical co-tide diagram based on relative admittance calculation. Background technique [0002] The earliest study on the distribution of tidal currents in the Bohai Sea, the Yellow Sea, and the East China Sea began with Ogura (1933 [1] ), he made the M 2 ,S 2 , K 1 and O 1 tidal chart. From the late 1950s to the early 1960s, my country's national marine census made a large number of observations and analyzes of the tidal currents west of 124°E in the Bohai Sea, the Yellow Sea, and the East China Sea. Based on these data, a more accurate tidal current than Ogura was drawn. Distribution. Fang (1986 [2] ,1994 [3] ) further improved the results of the national marine census based on the data of coastal tide gauge stations and offshore tidal current observation data. However, due to the limitations of observational data at that tim...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 徐晓庆魏泽勋王永刚李淑江范斌徐腾飞滕飞高秀敏
Owner THE FIRST INST OF OCEANOGRAPHY SOA
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