基于雷达遥感的北部湾海洋特性提取与分析
发布时间：2018-12-14 22:00
【摘要】：北部湾位于我国南海的西北部,是我国西南部唯一的沿海地区。北部湾属于半封闭型海湾,海水交换能力不强,尤其位于湾顶的沿海浅水净化能力较差,而这一带又是各种海洋活动频繁的密集区域,一旦发生海洋环境重大事故,如果应对不及时将会带来很严重的环境问题。因此,北部湾海洋特性提取与分析对北部湾海洋的经济发展和环境保护显得尤为重要。目前研究北部湾海洋的很多工作由于受到设备条件的限制,获取的数据主要来自于常年积累的定点观测统计数据。数据代表的范围小,时间跨度大,满足不了现在整体性和实时性的研究需要。由于受观测点与观测数据的限制,研究内容主要还是停留在潮汐,特定海流等局部或者单一特性的研究。但是上述针对北部湾潮汐、潮流的模拟数值计算与分析,由于受数据采集方式的限制,大部分的研究都是基于模拟条件下的推演,缺少大量实测数据的验证支持。针对上述问题,论文主要工作如下：首先,利用便携式高频地波雷达对北部湾海洋进行遥感探测并获取海面状态环境参数；然后,对有无台风影响北部湾海洋情况下的雷达回波谱进行距离谱特性提取与分析；接着,根据距离谱中的一阶多普勒谱反演北部湾海洋表面径向流,提取并分析径向流特性,同时研究了湾内的潮汐规律,以及潮汐对表面流的影响；最后,根据距离谱中的二阶多普勒谱反演北部湾海洋表面径向风场进行,获取“天兔”台风期间北部湾海洋表面风场,提取并分析海洋表面风速参数特性。研究结果表明从海洋回波数据中能够提取反映北部湾海洋特点的动力学参数信息,验证了便携式高频地波雷达能够满足北部湾海洋环境监测与研究的需要。
[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.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P715.7
本文编号：2379390
[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.
【学位授予单位】：广西师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P715.7
【参考文献】
相关期刊论文 前1条
1 柳艳菊;闫俊岳;宋艳玲;;近50年南海西沙地区的气候变化特征研究[J];地理科学;2008年06期
，本文编号：2379390
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