一種改進(jìn)型的基于Stokes一階波的海浪磁場(chǎng)模型
doi: 10.11999/JEIT161123
基金項(xiàng)目:
國家深度資源勘探的關(guān)鍵設(shè)備和技術(shù)研究(ZDYZ2012-1-03)
Improved Model of Ocean Wave Induced Magnetic Field Based on the First Order Stokes Equtions
Funds:
The RD of Key Instruments and Technologies for Deep Resources Prospecting (The National RD Projects for Key Scientific Instruments) of China ( ZDYZ2012-1-03)
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摘要: 海洋磁場(chǎng)測(cè)量是海洋科學(xué)觀測(cè)、海底資源勘探、國防安全等領(lǐng)域的基本手段之一。研究海浪等海水運(yùn)動(dòng)的磁場(chǎng)噪聲機(jī)理、預(yù)測(cè)模型及抑制方法對(duì)于提高海洋磁測(cè)精度具有重要的意義。該文在分析一階Stokes波浪運(yùn)動(dòng)方程的基礎(chǔ)上，提出一種改進(jìn)型的海浪磁場(chǎng)模型，并推導(dǎo)出深海和淺海條件下的簡(jiǎn)化公式。為了驗(yàn)證模型的有效性，在2015年第15號(hào)臺(tái)風(fēng)天鵝過境期間，對(duì)我國南海某海域的海洋環(huán)境磁場(chǎng)進(jìn)行了觀測(cè)，并將該文模型和經(jīng)典的Weaver模型分別與測(cè)試結(jié)果進(jìn)行了對(duì)比。結(jié)果表明，該文提出的改進(jìn)型模型能夠更加準(zhǔn)確地預(yù)測(cè)海浪磁場(chǎng)大小，預(yù)測(cè)精度比Weaver模型提高了近一個(gè)量級(jí)，可為海洋磁場(chǎng)測(cè)量的噪聲抑制提供一種更加有效的工具。
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關(guān)鍵詞:
- 海洋磁場(chǎng)測(cè)量 /
- 海浪磁場(chǎng)模型 /
- 海洋深度 /
- Weaver模型
Abstract: Marine magnetic survey is one of the basic methods for oceanographic observation, seabed resource prospection and national defense security. Learning about the mechanism of the wave induced magnetic field, the prediction model and the methods of noise suppression are of great importance for improving the measurements accuracy. On the basis of analysing the first order Stokes wave motion equations, this paper proposes an improved model of the ocean wave induced magnetic field, together with simplified formulas for the deep and shallow water conditions. In order to verify the validity of the model, an observation was done in the South China Sea in 2015. By comparing the proposed model with the classic Weavers model and the test results, it is shown that the proposed modified model can make an accurate prediction which is nearly an order of magnitude higher than Weavers model on the ocean wave induced magnetic field. This makes the proposed model a more effective tool of noise suppression for Marine magnetic field measurement. -
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