本文選題：南海 + 潮流和余流��； 參考：《大連海洋大學(xué)》2014年碩士論文

【摘要】：本文基于南海北部走航ADCP(Acoustic Doppler Current Profile)觀測(cè)資料，重點(diǎn)對(duì)瓊州海峽的潮余流的分布特征和余流形成的動(dòng)力機(jī)制，以及南海西邊界流、暖流和中尺度渦的結(jié)構(gòu)特征和水團(tuán)屬性進(jìn)行研究和探討。 2013年春季，為了研究瓊州海峽的潮流共進(jìn)行了33個(gè)斷面的走航ADCP觀測(cè)，并第一次使用改進(jìn)潮汐調(diào)和分析法估算橫穿海峽方向斷面的潮流和余流分布。針對(duì)本研究，通過模擬實(shí)驗(yàn)證實(shí)改進(jìn)潮汐調(diào)和分析法的可信性，其可以很好控制解中誤差的大小和偏差范圍。潮流橢圓主軸的方向均平行于海峽的走向，且全日潮在5個(gè)分潮（O1，K1，M2，S2和MSF）中起主導(dǎo)作用， O1，K1，，M2，S2和MSF分潮振幅的斷面平均值比率為1.00:0.74:0.34:0.51:0.52。沿整個(gè)斷面的余流均為西向，通過斷面余流流速平均值和流量分別為19.3±2.4cm s-1和-0.182±0.0220Sv (Sv=106m3s-1)。動(dòng)力分析表明，潮流活動(dòng)比平均流場(chǎng)以及渦的活動(dòng)更加起主導(dǎo)作用，且潮流的“調(diào)整”過程和海峽東西兩入口的水位差是瓊州海峽西向余流的主要驅(qū)動(dòng)力。 南海北部海流觀測(cè)研究結(jié)果表明，陸架上方的表層西邊界流東北和西南季風(fēng)下的最大流速（流量）范圍分別為26.9-67.0cm s-（10.74-9.70Sv）和20.3-61.0cm s-（10.45-13.29Sv），平均流幅和厚度分別為140km和210m。陸坡附近的南海暖流呈帶狀結(jié)構(gòu)，東北和西南季風(fēng)下最大流速（流量）范圍分別為6.1-29.0cm s-1（0.14-2.44Sv）和12.3-31.2cms-1（1.10-5.68Sv），平均流幅和厚度分別為45km和700m。南海暖流大致沿著500-1000m等深線流向東北，但流動(dòng)過程中有時(shí)會(huì)在114°E附近出現(xiàn)向南偏轉(zhuǎn)的跡象。 東北和西南季風(fēng)環(huán)境下均抓拍到西邊界流和中尺度渦相互擾動(dòng)的過程，并獲得完整的垂向流速結(jié)構(gòu)。東北季風(fēng)下的反氣旋渦半徑約180km，垂向深度超過800m，而西南季風(fēng)下氣旋渦的半徑約135km，垂向深度約780m，強(qiáng)度略小于東北季風(fēng)下的渦旋。東北季風(fēng)下還抓拍到同一斷面短時(shí)間內(nèi)暖流和西邊界流的結(jié)構(gòu)變化過程。在越南半島東部，15°N，110°E附近成功觀測(cè)到有暖流通過,此位置是迄今為止所有報(bào)道中的最西側(cè)。通過本文的研究可以對(duì)瓊州海峽的潮余流以及南海北部的暖流、西邊界流和中尺度渦取得有價(jià)值的認(rèn)識(shí)。
[Abstract]:Based on the ADCP(Acoustic Doppler Current Profile) observations of the northern South China Sea, this paper focuses on the distribution characteristics of the tidal residual currents in the Qiongzhou Strait and the dynamic mechanism of the formation of the residual currents, as well as the western boundary currents in the South China Sea. The structure characteristics and water mass properties of warm current and mesoscale vortex are studied and discussed. In spring 2013, a total of 33 cross-section ADCP observations were carried out to study the tidal current in Qiongzhou Strait, and the improved tidal harmonic analysis method was used for the first time to estimate the distribution of tidal currents and residual currents across the channel. In this study, the credibility of the improved tidal harmonic analysis method is proved by simulation experiments, which can well control the magnitude of the error and the range of deviation in the solution. The direction of the main axis of the tidal current ellipse is parallel to the trend of the Strait, and the diurnal tide plays a leading role in the five tidal components: O1K1K1M2O2 and MSF). The cross section average ratio of the O1K1M2OS2 and MSF tidal amplitude is 1.00: 0.74: 0.34: 0.51V0.52. The residual flow along the whole section is westward, and the mean velocity and flow rate of the residual flow through the section are 19.3 鹵2.4cm s-1 and -0.182 鹵0.0220Sv respectively. The dynamic analysis shows that the tidal current plays a more dominant role than the average flow field and the vortex activity, and the "adjustment" process of the tidal current and the water level difference between the east and west entrance of the strait are the main driving forces of the westward residual current in the Qiongzhou Strait. The results of current observation in the northern South China Sea indicate that the maximum velocity (discharge) ranges of the surface west boundary current under the northeast and southwest monsoon above the continental shelf are 26.9-67.0cm s -N 10.74-9.70 Sv) and 20.3-61.0cm s -N 10.45-13.29 Sv, respectively, and the average current amplitude and thickness are 140km and 210 m, respectively. The warm currents in the South China Sea near the continental slope have a zonal structure. The maximum velocity (discharge) ranges from 6.1-29.0cm s-1 ~ 0.14-2.44 Sv under the northeast and southwest monsoon, respectively, and 12.3-31.2cms-1 ~ (-1) ~ 1.10-5.68 Sv ~ (-1). The average flow amplitude and thickness are 45km and 700m respectively. The warm current in the South China Sea flows roughly along the 500-1000m isobath to the northeast, but sometimes there are signs of a southward deflection near 114 擄E. The process of disturbance between the western boundary flow and mesoscale vortex was captured in the northeast and southwest monsoon environments, and a complete vertical velocity structure was obtained. The reverse vortex radius is about 180 km and the vertical depth is more than 800 m under the northeast monsoon, while the radius of the vortex is about 135 km and the vertical depth is about 780 m under the southwest monsoon, which is slightly less than that of the vortex under the northeast monsoon. The structural changes of the warm current and the western boundary current in the same section were also captured under the northeast monsoon. A warm current was observed in the eastern part of the Vietnamese Peninsula near 15 擄Nu 110 擄E. this position is the westernmost of all reports so far. Through the research in this paper, we can get a valuable understanding of the tidal residual current in Qiongzhou Strait and the warm current, western boundary current and mesoscale vortex in the northern part of the South China Sea.
【學(xué)位授予單位】：大連海洋大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P714.1

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