【摘要】：過去對于南海北部源于呂宋海峽的大振幅內(nèi)孤立波數(shù)值模擬研究多局限于理想地形和二維數(shù)值模擬，最新的研究表明，內(nèi)孤立波在呂宋海峽的生成過程存在顯著的三維特性。本文采用基于真實地形、潮汐的高分辨率三維非靜力近似數(shù)值模式MITgcm，對南海北部覆蓋整個呂宋海峽的內(nèi)孤立波生成及其深海傳播過程進行了數(shù)值模擬研究。 本文通過將模擬結(jié)果與已被廣泛使用的潮汐數(shù)據(jù)集，現(xiàn)場緯向流速觀測數(shù)據(jù)及SAR圖片進行對比，驗證了模擬結(jié)果的準(zhǔn)確性。之后通過海面高度梯度的變化規(guī)律，分析了a波的三維形成過程，發(fā)現(xiàn)a波主要源于薩布塘島西南側(cè)海域所激發(fā)的內(nèi)波與西側(cè)恒春海脊中部局地激發(fā)的內(nèi)波間的波波相互作用�；谛眽耗芡康淖兓�(guī)律，發(fā)現(xiàn)b波主要源于臺灣島南側(cè)與恒春海脊中北部，b波為由北向南逐漸形成，在其形成過程中存在顯著的南向斜壓能通量。 基于斜壓能通量與多個無量綱參數(shù)，本文細致討論了呂宋海峽中內(nèi)孤立波的主要源地并評估了其生成機制，，發(fā)現(xiàn)呂宋海峽中內(nèi)孤立波的主要源地為分布于呂宋海峽東西兩座海脊的8個不同的海區(qū)，內(nèi)孤立波的生成機制為混合山后波機制或內(nèi)潮波機制，南海北部大振幅、長波峰線的內(nèi)孤立波則源于多個不同源地內(nèi)波間的波波相互作用；呂宋海峽處激發(fā)的東向傳播的內(nèi)孤立波主要源于東側(cè)蘭嶼海脊北部。 本文通過三個敏感性實驗進一步研究了K1、M2分潮對南海北部大振幅內(nèi)孤立波的貢獻及呂宋海峽處緯向不均勻溫鹽分布對南海北部大振幅內(nèi)孤立波生成與傳播過程的影響。結(jié)果顯示，單獨的K1分潮無法激發(fā)顯著的內(nèi)孤立波信號；在南海北部，b波主要受M2分潮支配，全日分潮對其影響很小，a波的形成則同時由全日分潮與半日分潮的共同支配；第二模態(tài)內(nèi)孤立波主要受M2分潮影響，而第一模態(tài)內(nèi)孤立波則由全日分潮與半日分潮的共同支配；呂宋海峽溫鹽分布的緯向不均勻能夠顯著增加西傳內(nèi)孤立波波列中內(nèi)孤立波的數(shù)量及振幅，但不會影響呂宋海峽西傳大振幅內(nèi)孤立波的三維生成過程與源地，在研究，尤其是預(yù)報源自呂宋海峽的內(nèi)孤立波，時應(yīng)考慮其影響。
[Abstract]:In the past, the numerical simulation of large amplitude internal solitary waves in the northern South China Sea originated from Luzon Strait is mostly limited to ideal topography and two-dimensional numerical simulation. The latest research shows that the formation process of internal solitary waves in Luzon Strait has significant three-dimensional characteristics. In this paper, the high-resolution three-dimensional non-static approximate numerical model MITgcm, which is based on real topography and tide, is used to simulate the generation and deep-sea propagation of internal solitary waves covering the whole Luzon Strait in the northern South China Sea. In this paper, the accuracy of the simulation results is verified by comparing the simulation results with the tidal data set, the field zonal velocity observation data and SAR images, which have been widely used. Then, through the variation law of sea surface height gradient, the three-dimensional formation process of a wave is analyzed. It is found that the a wave mainly originates from the wave interaction between the internal wave excited by the southwest sea area of Sabutang Island and the locally excited internal wave in the middle part of the Hengchun ridge on the west side. Based on the variation of baroclinic energy flux, it is found that b wave mainly originates from the south side of Taiwan Island and the central and northern part of Hengchun ridge, and the b wave is gradually formed from north to south, and there is a significant southward baroclinic energy flux in the process of its formation. Based on baroclinic energy flux and several dimensionless parameters, the main sources of internal solitary waves in Luzon Strait are discussed in detail and their generation mechanism is evaluated. It is found that the main sources of solitary waves in Luzon Strait are eight different sea areas distributed in the east and west ridges of Luzon Strait. The generation mechanism of internal solitary waves is mixed mountain wave mechanism or internal tidal wave mechanism, and the large amplitude in the northern part of the South China Sea. The internal solitary wave of the long wave peak line originates from the wave interaction between the internal waves in many different sources. The eastward propagation of solitary waves in the Luzon Strait mainly originates from the northern part of the Orchid Ridge on the east side. In this paper, the contribution of K1, M2 tide to large amplitude internal solitary waves in the northern South China Sea and the influence of zonal uneven temperature and salt distribution in Luzon Strait on the generation and propagation of large amplitude internal solitary waves in the northern part of the South China Sea are further studied by three sensitivity experiments. The results show that the K1 tide alone can not stimulate the significant internal solitary wave signal, in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide, while the solitary wave in the second mode is mainly influenced by M2 tide, while in the first mode, the solitary wave is dominated by the full diurnal tide and the semidiurnal tidal wave, while in the northern part of the South China Sea, the b wave is mainly dominated by M2 tide, and the formation of a wave is dominated by both the full diurnal tide and the semidiurnal tide. The zonal inhomogeneity of temperature and salt distribution in Luzon Strait can significantly increase the number and amplitude of internal solitary waves in westward solitary wave train, but it will not affect the three-dimensional generation process and source of large amplitude internal solitary waves in Luzon Strait. In the study, especially in the prediction of internal solitary waves from Luzon Strait, its influence should be taken into account.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P731.2

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本文編號：2505057