【摘要】：北部灣位于我國南海的西北部,是我國西南部唯一的沿海地區(qū)。北部灣屬于半封閉型海灣,海水交換能力不強,尤其位于灣頂?shù)难睾\水凈化能力較差,而這一帶又是各種海洋活動頻繁的密集區(qū)域,一旦發(fā)生海洋環(huán)境重大事故,如果應(yīng)對不及時將會帶來很嚴重的環(huán)境問題。因此,北部灣海洋特性提取與分析對北部灣海洋的經(jīng)濟發(fā)展和環(huán)境保護顯得尤為重要。目前研究北部灣海洋的很多工作由于受到設(shè)備條件的限制,獲取的數(shù)據(jù)主要來自于常年積累的定點觀測統(tǒng)計數(shù)據(jù)。數(shù)據(jù)代表的范圍小,時間跨度大,滿足不了現(xiàn)在整體性和實時性的研究需要。由于受觀測點與觀測數(shù)據(jù)的限制,研究內(nèi)容主要還是停留在潮汐,特定海流等局部或者單一特性的研究。但是上述針對北部灣潮汐、潮流的模擬數(shù)值計算與分析,由于受數(shù)據(jù)采集方式的限制,大部分的研究都是基于模擬條件下的推演,缺少大量實測數(shù)據(jù)的驗證支持。針對上述問題,論文主要工作如下：首先,利用便攜式高頻地波雷達對北部灣海洋進行遙感探測并獲取海面狀態(tài)環(huán)境參數(shù)；然后,對有無臺風(fēng)影響北部灣海洋情況下的雷達回波譜進行距離譜特性提取與分析；接著,根據(jù)距離譜中的一階多普勒譜反演北部灣海洋表面徑向流,提取并分析徑向流特性,同時研究了灣內(nèi)的潮汐規(guī)律,以及潮汐對表面流的影響；最后,根據(jù)距離譜中的二階多普勒譜反演北部灣海洋表面徑向風(fēng)場進行,獲取“天兔”臺風(fēng)期間北部灣海洋表面風(fēng)場,提取并分析海洋表面風(fēng)速參數(shù)特性。研究結(jié)果表明從海洋回波數(shù)據(jù)中能夠提取反映北部灣海洋特點的動力學(xué)參數(shù)信息,驗證了便攜式高頻地波雷達能夠滿足北部灣海洋環(huán)境監(jiān)測與研究的需要。
[Abstract]:Beibu Gulf is located in the northwest of South China Sea and is the only coastal area in southwest China. The Beibu Gulf is a semi-enclosed bay with a weak seawater exchange capacity, especially the shallow water purification capacity of the coastal area located on the top of the bay, which is also a dense area with frequent marine activities. Once a major marine environmental accident occurs, If not in time, it will bring serious environmental problems. Therefore, the extraction and analysis of oceanic characteristics in Beibu Gulf is particularly important for the economic development and environmental protection of Beibu Gulf. At present, many researches on the Beibu Gulf ocean are limited by equipment conditions, and the data obtained mainly come from the statistical data of fixed point observation accumulated all year round. The range of data representation is small and the time span is large, which can not meet the research needs of integrity and real-time. Due to the limitation of observation points and observational data, the research is mainly focused on the study of local or single characteristics such as tides, specific currents and so on. However, due to the limitation of data acquisition, most of the researches are based on the simulation of the tide and tidal current in Beibu Gulf, which is lack of the verification support of a large number of measured data. The main work of this paper is as follows: firstly, the portable high-frequency ground wave radar is used to detect the Beibu Gulf ocean by remote sensing and to obtain the environmental parameters of the sea surface state. Then, the range spectrum characteristics of radar echo spectrum in the Beibu Gulf ocean with or without typhoon are extracted and analyzed. Then, according to the first order Doppler spectrum of the distance spectrum, the radial current of the Beibu Gulf ocean surface is retrieved and analyzed, and the tidal law in the bay and the influence of the tide on the surface current are studied at the same time. Finally, the radial wind field of the Beibu Gulf ocean surface is retrieved from the second order Doppler spectrum of the distance spectrum, and the wind field of the Beibu Gulf ocean surface during the Typhoon Tianyu is obtained, and the characteristics of the wind velocity parameters on the sea surface are extracted and analyzed. The results show that the dynamic parameters can be extracted from the ocean echo data, and the portable HF ground wave radar can meet the needs of marine environment monitoring and research in Beibu Gulf.
【學(xué)位授予單位】：廣西師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P715.7

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1 柳艷菊;閆俊岳;宋艷玲;;近50年南海西沙地區(qū)的氣候變化特征研究[J];地理科學(xué);2008年06期

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本文編號：2379390