本文關(guān)鍵詞：南海北部灣FVCOM潮汐模式的高度計(jì)同化模擬研究　出處：《上海海洋大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： FVCOM 北部灣 高度計(jì) 潮汐 分布式摩擦

【摘要】：潮汐水動(dòng)力對于近海漁業(yè)捕撈和海洋生態(tài)研究非常重要。本文基于非結(jié)構(gòu)網(wǎng)格有限體積FVCOM模式建立北部灣潮汐模式，并利用近6.5年Jason-1衛(wèi)星高度計(jì)沿軌數(shù)據(jù)提取的潮汐信息對模式使用Nudging方法進(jìn)行同化。 模式將OTIS（OSU Tidal Data Inversion）里China Sea范圍中六個(gè)分潮（S2，M2，N2，K1，O1，Q1）的調(diào)和常數(shù)的水位預(yù)報(bào)值作為開邊界驅(qū)動(dòng)。本文主要采用三個(gè)方案建立北部灣潮汐模式，1)僅采用開邊界進(jìn)行驅(qū)動(dòng)，底摩擦系數(shù)采用常值0.0015。2)在方案1的基礎(chǔ)上，加入高度計(jì)數(shù)據(jù)進(jìn)行同化。3)在方案1的基礎(chǔ)上，優(yōu)化邊界條件并采用分布式摩擦。 由方案2和方案1的結(jié)果比較得出，高度計(jì)數(shù)據(jù)同化在計(jì)算區(qū)域內(nèi)對模式精度有所改進(jìn)， m1[(K1+O1)/2]振幅的平均絕對誤差由24.73cm減小到5.91cm，遲角平均絕對誤差由14.76°減小至11.11°。M2振幅的平均絕對誤差由7.96cm減小到7.57cm，遲角平均絕對誤差由34.33°減小至7.21°。改進(jìn)效果比較明顯。但是與驗(yàn)潮站數(shù)據(jù)相比，達(dá)不到理想的精度。 由方案3和方案1的結(jié)果比較得出，底摩擦對模式精度亦有所改進(jìn)。m1振幅的平均絕對誤差由24.73cm減小到2.74cm，遲角平均絕對誤差由14.76°減小至5.40°。M2振幅的平均絕對誤差由7.96cm減小到6.19cm，遲角平均絕對誤差由34.33°減小至7.24°。與方案二相比，方案三的結(jié)果與實(shí)測數(shù)據(jù)更為接近，可以更明顯的模擬出潮汐場形態(tài)的局部特征。 可能是由于北部灣是淺水灣地區(qū)，Jason-1在本區(qū)域內(nèi)的測量精度存在疑問，另外計(jì)算區(qū)域內(nèi)地形復(fù)雜，島嶼較多，島嶼附近測高點(diǎn)數(shù)據(jù)不連續(xù)，也會(huì)影響高度計(jì)的測量精度。研究區(qū)域較小，衛(wèi)星軌跡間隔較大，，衛(wèi)星數(shù)據(jù)空間分辨率較低。高度計(jì)資料采樣的時(shí)間間隔較大，容易引起潮汐的高頻混淆。 本文詳細(xì)分析了m1和M2分潮的潮汐和潮流特征。方案2和3模式結(jié)果與以往研究者的結(jié)果基本一致。模式結(jié)果表明：北部灣海域表現(xiàn)為標(biāo)準(zhǔn)的全日潮性質(zhì)， m1在計(jì)算區(qū)域的西南部振幅偏小，在越南順化沿岸有一個(gè)退化了的無潮點(diǎn)，同潮時(shí)線沿著此點(diǎn)做逆時(shí)針旋轉(zhuǎn)。M2分潮在北部灣的振幅與m1相比普遍較小，M2分潮在海防北部有一個(gè)退化無潮點(diǎn)，同潮時(shí)線沿著此點(diǎn)逆時(shí)針傳播。北部灣潮流和潮汐一樣，m1分潮為主要分潮。海南島西岸及西北岸m1分潮的潮流速度比M2分潮大的多。m1和M2分潮的長軸走向除了在瓊州海峽是東西方向，其余都與北部灣的灣軸方向基本一致。對于m1和M2分潮來說，北部灣大部分海區(qū)潮流是往復(fù)流，但在瓊州海峽西側(cè)表現(xiàn)出很強(qiáng)的旋轉(zhuǎn)型。除此之外瓊州海峽東側(cè)m1和M2分潮也表現(xiàn)出比較強(qiáng)的旋轉(zhuǎn)性。m1分潮在海南島南側(cè)北部灣灣口，還有M2分潮在海南島西側(cè)北部灣內(nèi)也有較強(qiáng)的旋轉(zhuǎn)性。
[Abstract]:Tidal hydrodynamics is very important for the study of offshore fishing and marine ecology. In this paper, the Beibu Gulf tidal model is established based on the unstructured grid finite volume FVCOM model. The model is assimilated by Nudging method using tidal information extracted from Jason-1 altimeter data in the past 6.5 years. In the model, the six tidal components in the China Sea range of OTIS(OSU Tidal Data inversion are S2M2N2N2K1O1. In this paper, three schemes are used to establish the Beibu Gulf tidal model. The coefficient of bottom friction is constant 0.0015.2) on the basis of scheme 1, the altimeter data is added to assimilate. 3) on the basis of scheme 1, the boundary conditions are optimized and distributed friction is adopted. By comparing the results of scheme 2 and scheme 1, it is concluded that the data assimilation of altimeter improves the accuracy of the model in the calculation area, and M1. [The mean absolute error of the amplitude of K _ (1) O _ (1 / 2) decreased from 24.73 cm to 5.91 cm. The mean absolute error of the amplitude of delay angle decreased from 14.76 擄to 11.11 擄路M2 from 7.96 cm to 7.57 cm. The average absolute error of the delay angle is reduced from 34.33 擄to 7.21 擄. The improved results are obvious, but compared with the tide station data, the accuracy is not satisfactory. By comparing the results of scheme 3 and scheme 1, it is found that the average absolute error of the amplitude of the bottom friction pair is reduced from 24.73 cm to 2.74 cm. The mean absolute error of the amplitude of delay angle decreased from 14.76 擄to 5.40 擄路M2 from 7.96 cm to 6.19 cm. The mean absolute error of late angle is reduced from 34.33 擄to 7.24 擄. Compared with scheme 2, the result of scheme 3 is closer to the measured data, and the local characteristics of tidal field can be simulated more obviously. It is possible that the accuracy of Jason-1 measurement in the Beibu Gulf is in doubt in the repulse Bay area. In addition, the topography of the calculation area is complex, there are more islands, and the height data near the islands are not continuous. The measurement accuracy of altimeter is also affected. The study area is smaller, the satellite trajectory is larger, the spatial resolution of satellite data is lower, and the time interval of altimeter data sampling is larger, which is liable to cause the high frequency confusion of tide. In this paper, the tidal and tidal current characteristics of M1 and M2 tides are analyzed in detail. The results of models 2 and 3 are in good agreement with those of previous researchers. The results of the models show that:. The sea area of Beibu Gulf is characterized by a standard diurnal tide. The amplitude of M1 is small in the southwestern part of the calculated area, and there is a degenerated non-tidal point along the hue of Vietnam. The amplitude of the m 2 component in Beibu Gulf is generally smaller than that of M 1 along the counter clockwise rotation along the same tide time line. There is a degenerated non tide point in the northern coast of Haiphong. The isotide line propagates counterclockwise along this point. The Beibu Gulf tidal current is the same as the tide. M 1 is the main component. The velocity of m 1 in the west coast and the west west coast of Hainan island is much higher than that in m 2. The long axis of m 1 and m 2 is more than that of m 2, except in the Qiongzhou strait. The rest are basically consistent with the Bay axis of the Beibu Gulf. For M1 and M2 tides, the tidal currents in most of the Beibu Gulf are reciprocating currents. In addition to the east side of Qiongzhou Strait M1 and M2 tide also show a strong rotation. M1 tide in the southern side of Hainan Island Beibu Gulf mouth. And the M 2 tide also has strong rotation in the Beibu Gulf on the west side of Hainan Island.
【學(xué)位授予單位】：上海海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P731.23;P714.1

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相關(guān)期刊論文 前1條

1 殷忠斌，陳明劍，李樹華，郭芝蘭;北部灣潮汐數(shù)值計(jì)算參數(shù)的試驗(yàn)[J];廣西科學(xué);1996年02期

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