廣西北部灣風(fēng)暴潮的數(shù)值模擬
發(fā)布時間：2018-11-19 17:07
【摘要】：風(fēng)暴潮災(zāi)害是廣西沿海主要的海洋災(zāi)害,由于地處北部灣灣頂,獨特的地理特征使得廣西風(fēng)暴潮不同于我國其他海岸風(fēng)暴潮。通過數(shù)值模擬對風(fēng)暴潮對北部灣的風(fēng)暴潮進(jìn)行研究,有助于加深對北部灣風(fēng)暴潮地域特點及其動力機(jī)制的理解。本文利用廣西沿海部分氣象站2012年13次臺風(fēng)“啟德”過境期間的風(fēng)速風(fēng)向觀測資料,反演建立了一個合理的理想臺風(fēng)風(fēng)場;同時建立了一個模擬結(jié)果良好的北部灣的FVCOM潮汐模型。在此基礎(chǔ)上建立了廣西北部灣FVCOM風(fēng)暴潮-潮汐耦合模型,對1213次“啟德”臺風(fēng)風(fēng)暴潮進(jìn)行了純風(fēng)暴潮以及風(fēng)暴潮-潮汐耦合的模擬,并利用水位資料對其進(jìn)行驗證。1213次臺風(fēng)風(fēng)暴潮模擬結(jié)果顯示:本次臺風(fēng)主要作用于北部灣北部海區(qū),主要增減水區(qū)域為廣西沿海以及越南北部沿海,臺風(fēng)過程對于水體的“攪拌”作用可影響至全灣,但在北部海區(qū)余流響應(yīng)更明顯,底層海水也受到劇烈的影響。海灣增減水分布以及流場分布與臺風(fēng)風(fēng)場結(jié)構(gòu)以及路徑特點相對應(yīng)。本文也利用北部灣FVCOM風(fēng)暴潮模型對北部灣風(fēng)暴潮進(jìn)行了理想風(fēng)場實驗,以論證廣西北部灣風(fēng)暴增水強(qiáng)度與入侵熱帶氣旋路徑,移速,強(qiáng)度之間的關(guān)系,結(jié)果表明:西北行熱帶氣旋對北部灣作用時間較短,氣旋過后北部灣風(fēng)向迅速由穩(wěn)定東北風(fēng)變?yōu)榉�(wěn)定的西南風(fēng),風(fēng)向與海灣軸線一致,有利于海水在灣頂集聚,并且由于移動方向為西北方向,使得西風(fēng),南風(fēng)加強(qiáng),加強(qiáng)的南風(fēng)使得風(fēng)暴增水進(jìn)一步加強(qiáng)。西行熱帶氣旋對北部灣作用時間較長,并且北部灣長時間是處于臺風(fēng)上或者臺風(fēng)下,受到南北風(fēng)的同時影響,海區(qū)增減水不一致,海水難以大規(guī)模迅速集聚形成較高的風(fēng)暴增水,增水幅度小,擾動多。北部灣風(fēng)暴增減水大小與風(fēng)暴移速大小之間并不存在簡單的相關(guān)關(guān)系:一方面,隨著氣旋移速變大,氣旋風(fēng)場在氣旋移動方向上的分量增加,這可能有利于風(fēng)暴增減水;另一方面,氣旋移速變大,其影響北部灣時間較短,風(fēng)時較短又不利于風(fēng)暴增減水的增加;同時隨著風(fēng)暴移速變化,風(fēng)暴潮過程波動周期發(fā)生變化,風(fēng)暴潮潮位波動與海岸回潮波之間波波相互作用也發(fā)生變化,實際潮位也會隨之發(fā)生變化。臺風(fēng)強(qiáng)度的加強(qiáng)會加強(qiáng)風(fēng)暴增水振幅,并不影響風(fēng)暴潮頻率。各站點增減水的差異也體現(xiàn)了北部灣地形對于風(fēng)暴潮的影響,總體上表現(xiàn)為海灣增水強(qiáng),開闊海岸增水較弱,海區(qū)增水最小的趨勢。同時北部灣海灣狹長封閉的地理特征,也導(dǎo)致了海灣回潮波的影響較為明顯,北部灣風(fēng)暴增水曲線表現(xiàn)出余振時間長,主振擾動多的特點。
[Abstract]:Storm surge is the main marine disaster along the coast of Guangxi. Because it is located at the top of Beibu Bay, the storm surge in Guangxi is different from other coastal storm surges in China because of its unique geographical features. The study of storm surge in Beibu Gulf by numerical simulation is helpful to understand the regional characteristics and dynamic mechanism of storm surge in Beibu Gulf. Based on the observation data of wind speed and wind direction during the 13 Typhoon Qide transit in 2012, a reasonable ideal typhoon wind field has been established in this paper. At the same time, a FVCOM tidal model of Beibu Gulf with good simulation results is established. On the basis of this, the coupling model of FVCOM storm surge and tide in Beibu Gulf of Guangxi is established. The pure storm surge and the coupling between storm surge and tide are simulated for 1213 typhoon storm surges in Qide, Guangxi. The simulation results of 1213 typhoon storm surges show that the typhoon mainly acts on the northern sea area of Beibu Gulf, and the main areas of increasing and decreasing water are Guangxi coast and the northern coast of Vietnam. The "stirring" effect of typhoon on the water body can be affected to the whole bay, but the response of residual current in the northern sea area is more obvious, and the bottom seawater is also strongly affected. The distribution of increasing and decreasing water in the bay and the distribution of current field correspond to the structure of typhoon wind field and the characteristics of typhoon track. In this paper, the ideal wind field experiment of storm surge in Beibu Gulf is also carried out by using the FVCOM storm surge model in the Beibu Gulf, in order to demonstrate the relationship between the water increasing intensity of the storm and the track, velocity and intensity of the tropical cyclone invading in the Beibu Gulf of Guangxi. The results show that the northwestbound tropical cyclone acts on the Beibu Gulf for a short time. After the cyclone, the wind direction of the Beibu Gulf changes rapidly from a stable northeast wind to a stable southwest wind, and the wind direction is consistent with the Gulf axis, which is conducive to the concentration of sea water at the top of the bay. And because the direction of movement is northwest, the westerly and southerly winds are strengthened, and the strengthened south wind makes the storm increase water further. The westbound tropical cyclone acts on the Beibu Gulf for a long time, and the Beibu Gulf is on or under the typhoon for a long time, affected by the north and south winds simultaneously, and the increase and decrease of water in the sea area are not consistent. It is difficult for sea water to gather rapidly in a large scale to form a higher storm water increase, with small increase range and more disturbance. There is not a simple correlation between the increase and decrease of storm water and the speed of storm movement in Beibu Gulf. On the one hand, with the increase of cyclone velocity, the component of cyclone field increases in the direction of cyclone movement, which may be beneficial to the increase and decrease of storm water. On the other hand, the speed of cyclone moving becomes larger, which affects the Beibu Gulf for a short time, and the shorter wind time is not conducive to the increase of storm water supply. At the same time, with the change of storm velocity, the fluctuation period of storm surge process changes, the interaction between storm surge level fluctuation and coastal backtide wave also changes, and the actual tide level also changes. The increase of typhoon intensity will increase the amplitude of storm water, and will not affect the frequency of storm surge. The difference of increasing and decreasing water at different stations also reflects the influence of the topography of Beibu Gulf on storm surge. The general trend is that the increase of water in the bay is strong, the increase in water in the open coast is weak, and the increase in water in the sea area is the least. At the same time, the geographical characteristics of the narrow and narrow gulf of Beibu Gulf also lead to the obvious influence of the backtide waves in the Gulf. The water increasing curve of the Beibu Gulf Storm shows the characteristics of Yu Zhen long time and many main vibration disturbances.
【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
本文編號：2342905
[Abstract]:Storm surge is the main marine disaster along the coast of Guangxi. Because it is located at the top of Beibu Bay, the storm surge in Guangxi is different from other coastal storm surges in China because of its unique geographical features. The study of storm surge in Beibu Gulf by numerical simulation is helpful to understand the regional characteristics and dynamic mechanism of storm surge in Beibu Gulf. Based on the observation data of wind speed and wind direction during the 13 Typhoon Qide transit in 2012, a reasonable ideal typhoon wind field has been established in this paper. At the same time, a FVCOM tidal model of Beibu Gulf with good simulation results is established. On the basis of this, the coupling model of FVCOM storm surge and tide in Beibu Gulf of Guangxi is established. The pure storm surge and the coupling between storm surge and tide are simulated for 1213 typhoon storm surges in Qide, Guangxi. The simulation results of 1213 typhoon storm surges show that the typhoon mainly acts on the northern sea area of Beibu Gulf, and the main areas of increasing and decreasing water are Guangxi coast and the northern coast of Vietnam. The "stirring" effect of typhoon on the water body can be affected to the whole bay, but the response of residual current in the northern sea area is more obvious, and the bottom seawater is also strongly affected. The distribution of increasing and decreasing water in the bay and the distribution of current field correspond to the structure of typhoon wind field and the characteristics of typhoon track. In this paper, the ideal wind field experiment of storm surge in Beibu Gulf is also carried out by using the FVCOM storm surge model in the Beibu Gulf, in order to demonstrate the relationship between the water increasing intensity of the storm and the track, velocity and intensity of the tropical cyclone invading in the Beibu Gulf of Guangxi. The results show that the northwestbound tropical cyclone acts on the Beibu Gulf for a short time. After the cyclone, the wind direction of the Beibu Gulf changes rapidly from a stable northeast wind to a stable southwest wind, and the wind direction is consistent with the Gulf axis, which is conducive to the concentration of sea water at the top of the bay. And because the direction of movement is northwest, the westerly and southerly winds are strengthened, and the strengthened south wind makes the storm increase water further. The westbound tropical cyclone acts on the Beibu Gulf for a long time, and the Beibu Gulf is on or under the typhoon for a long time, affected by the north and south winds simultaneously, and the increase and decrease of water in the sea area are not consistent. It is difficult for sea water to gather rapidly in a large scale to form a higher storm water increase, with small increase range and more disturbance. There is not a simple correlation between the increase and decrease of storm water and the speed of storm movement in Beibu Gulf. On the one hand, with the increase of cyclone velocity, the component of cyclone field increases in the direction of cyclone movement, which may be beneficial to the increase and decrease of storm water. On the other hand, the speed of cyclone moving becomes larger, which affects the Beibu Gulf for a short time, and the shorter wind time is not conducive to the increase of storm water supply. At the same time, with the change of storm velocity, the fluctuation period of storm surge process changes, the interaction between storm surge level fluctuation and coastal backtide wave also changes, and the actual tide level also changes. The increase of typhoon intensity will increase the amplitude of storm water, and will not affect the frequency of storm surge. The difference of increasing and decreasing water at different stations also reflects the influence of the topography of Beibu Gulf on storm surge. The general trend is that the increase of water in the bay is strong, the increase in water in the open coast is weak, and the increase in water in the sea area is the least. At the same time, the geographical characteristics of the narrow and narrow gulf of Beibu Gulf also lead to the obvious influence of the backtide waves in the Gulf. The water increasing curve of the Beibu Gulf Storm shows the characteristics of Yu Zhen long time and many main vibration disturbances.
【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
【參考文獻(xiàn)】
相關(guān)期刊論文 前3條
1 羅義勇，，孫文心;北部灣風(fēng)暴潮的數(shù)值模擬──三維流速分解模型的一個應(yīng)用[J];青島海洋大學(xué)學(xué)報;1995年01期
2 吳培木,黃美芳,何洪扙,王永信,陳善深;粵西臺風(fēng)風(fēng)暴潮數(shù)值預(yù)報方法研究[J];海洋學(xué)報(中文版);1989年06期
3 夏華永,李樹華,侍茂崇;北部灣三維風(fēng)生流及密度流模擬[J];海洋學(xué)報(中文版);2001年06期
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