本文選題：渤海灣 + 潮流變化特征　； 參考：《中國海洋大學(xué)》2014年碩士論文

【摘要】：渤海是我國唯一的半封閉型內(nèi)海，潮流和海浪是其主要動力因素。在環(huán)渤海區(qū)域經(jīng)濟發(fā)展的關(guān)鍵時期，研究渤海區(qū)域的海洋動力特征，掌握其變化規(guī)律，對海洋藍色經(jīng)濟的發(fā)展有著深遠的意義。本文利用渤海埕北石油A平臺附近的AWAC數(shù)據(jù)資料分析了該海區(qū)的潮流和海浪特征以及兩者的相互作用。 潮流譜分析結(jié)果表明，半日潮流（M2和S2）和全日潮流（K1和O1）在該地區(qū)潮流中占主導(dǎo)地位。調(diào)和分析結(jié)果表明，潮流橢圓隨深度旋轉(zhuǎn)，且以逆時針旋轉(zhuǎn)為主，潮流振幅存在顯著的垂向變化。4個主要分潮隨深度變化的特征表明該地區(qū)流動受底邊界層影響，而上層流動則明顯受海表面風(fēng)和浪的影響�；贓OF分解的東西方向潮流的垂向模態(tài)中，零階模態(tài)的方差貢獻率為89.37%，斜壓模態(tài)的方差貢獻很小，表明東西向的流動有較強的正壓性特征。而南北方向潮流的垂向模態(tài)中，各高階模態(tài)的總方差貢獻率高達50%，體現(xiàn)了南北方向流動的斜壓性特征。 波浪數(shù)據(jù)的統(tǒng)計分析結(jié)果表明，在整個測量的時間段內(nèi)，有效波高基本都是小于3m的，其中又以0.3m左右大小的有效波高出現(xiàn)的最為頻繁。譜峰波向以東向為主，且波動較大。在有效波高較大的時間段內(nèi)，譜峰波向相對較穩(wěn)定，譜峰周期也相對較長。頻率在0.15~0.3Hz范圍內(nèi)的波浪的能量密度最大。且有效波高大的情況下，波浪的能量密度也大，能量分布的頻域也較廣。 結(jié)合潮流和波浪的數(shù)據(jù)，討論了水深和潮流對波浪的影響以及波浪對潮流的影響，初步認識了浪流相互作用的機制，包括底邊界摩擦、水深、潮流折射以及固有周期和絕對周期的調(diào)整。潮周期性特征的作用在對波浪要素的影響過程和浪對流的影響過程中得以突出體現(xiàn)。為了正確地分析無浪影響的潮流特征和潮平均下的波浪要素特征，都需要理解浪流相互作用的機制。例如，隨著波高的變大，，潮流的振幅會隨之減小。
[Abstract]:Bohai is the only semi enclosed inland sea in China. Tidal currents and waves are its main dynamic factors. In the critical period of economic development around Bohai region, it is of profound significance to study the marine dynamic characteristics of the Bohai region and grasp its changing rules, and it is of profound significance to the development of the marine blue economy. The AWAC data of the Chengbei petroleum A platform in Bohai is used in this paper. The tidal current and wave characteristics of the sea area and their interactions are analyzed.
The results of the flow spectrum analysis show that the half day tidal current (M2 and S2) and the all day flow (K1 and O1) dominate the tidal current in this area. The results of harmonic analysis show that the tidal current ellipse rotates with the depth, and is dominated by the counter clockwise rotation, and the amplitude of the tidal current has significant vertical variation. The characteristics of the variation of the tidal wave amplitude and the variation of the main tide with depth indicate that the flow is under the bottom of the region. The boundary layer is influenced by the boundary layer, while the upper flow is obviously influenced by the sea surface wind and the waves. In the vertical mode of the East-West trend based on the EOF decomposition, the variance contribution rate of the zero order mode is 89.37%, the variance contribution of the baroclinic mode is very small, which indicates that the East-West flow has a strong positive pressure characteristic. The contribution rate of the total variance of the order mode is as high as 50%, which reflects the baroclinic characteristics of the north-south direction.
The results of the statistical analysis of the wave data show that the effective wave height is basically less than 3m within the time period of the whole measurement, and the most frequent occurrence of the effective wave height around 0.3m is the most frequent. The peak wave to the East is dominant and fluctuates. The peak wave direction is relatively stable and the peak period of the spectrum peak is also relatively stable in the time period of the effective wave height. For longer, the energy density of waves in the range of 0.15~0.3Hz is the largest. And when the effective wave is tall, the energy density of the wave is large, and the frequency domain of the energy distribution is also wide.
Combined with the data of tidal and wave, the influence of water depth and tidal current on waves and the influence of wave on the flow are discussed. The mechanism of wave interaction is preliminarily recognized, including the friction of the bottom boundary, the depth of water, the refraction of the flow and the adjustment of the inherent period and absolute period. In order to correctly analyze the characteristics of the tidal current and the characteristics of the wave elements under the tide average, the mechanism of the wave interaction should be understood correctly. For example, the amplitude of the flow will decrease with the increase of the wave height.

【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

【參考文獻】

相關(guān)期刊論文 前1條

1 竇振興,羅遠詮,黃克辛,張存智,李龍章,蔡廣興,寧懷東;渤海潮流及湖余流的數(shù)值計算[J];海洋學(xué)報(中文版);1981年03期

本文編號：1803591