共查询到19条相似文献，搜索用时 125 毫秒
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台湾岛地处亚欧大陆和太平洋交界处,台风、东北季风等所引起的海洋灾害频繁,所以建立完备的海洋水文观测体系显得尤为重要.中国台湾自主建置完成的近海水文观测体系由资料浮标站、观测桩、潮位站、岸边气象站、雷达测波站等多种近海水文观测系统构建组成;同时,为确保观测体系的准确性和规范性,还建立了数据品质管理系统和标准化作业模式.在近海水文观测数据的分析方面,尝试应用新的数学分析方法,如通过EMD(empirical mode decomposition)方法探讨风暴潮水位变化,利用小波转换从雷达观测影像中分析近岸波浪信息,以及发展数据同化技术将观测数据应用于作业化波浪现报、预报模式.此外,近海水文观测体系在社会应用方面有着很大的发展潜质. 相似文献
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目前我国已经进口了Ｘ 波段雷达,大多数使用的ＷＡＶＥＸ 海事雷达海浪数据采集系统。利用Ｘ 波段雷达开发监测海浪的波高、波长、波向与波周期等相关参数已经取得初步成果。同时,在Ｘ 波段雷达数据质量控制以及将雷达数据与海洋动力学模型进行同化方面积累了一定的经验,但距离制定明确的应用规范还存在较大差距。文章试图通过对东海区Ａ、Ｂ两个海洋站Ｘ 波段雷达与波浪浮标、人工观测数据等比测数据的分析,得出比测方法中比对仪器选择、环境因素、海况等方面的要求,以得到更为准确的比测结果。 相似文献
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《海洋技术学报》2023,(2)
珠江口水文信息系统的水文观测站都是无人站, 采用的均是浮子式水位计, 且数量逐年增多, 发生故障后, 修复时间长, 造成数据缺测。为了解决这个问题, 本文提出使用浮子水位、雷达水位双备份观测方式, 数据中心可以通过人工干预或系统自动智能诊断方式分时间段分别从浮子水位、雷达水位中挑选数据作为该站点的实际连续观测数据。本文阐述浮子水位和雷达水位双备份观测的实时数据传输系统组成及工作原理, 并通过对浮子水位、雷达水位观测数据的对比分析, 验证数据中心通过这种分时间段组合挑选的数据具有连续性、有效性, 可作为观测站的实际观测数据, 浮子水位、雷达水位双备份观测系统可以应用在珠江口水文信息系统或类似观测领域。 相似文献
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为完善海洋观测体系,提高海洋观测数据在海洋预报和海洋防灾减灾中的适用性,文章以海洋经济较发达和遭受海洋灾害较多的温州市和台州市为例,选取潮位、波浪和水温3个重要海洋观测要素,分析海洋观测数据在海洋预报和海洋防灾减灾中的适用,并提出对策建议。研究结果表明:由于观测时间较短、地理位置特殊和数据代表性不足,海洋观测站的潮位数据未能在台风风暴潮的预报和防灾减灾中有效发挥作用;由于波浪观测仪器布设位置的地形阻挡和观测站少,波浪数据的预报准确性和实际应用不足;个别观测站的水温数据不适用于大面海洋环境和赤潮的预报,且缺少对低温灾害的观测。针对海洋观测数据的实际应用与相关业务脱节的问题,未来应提高观测数据质量、紧密结合当地海洋预报和海洋防灾减灾工作需求、开展重点目标保障预报工作以及加强海洋观测宣传教育。 相似文献
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近年来,X波段雷达已经成为重要的海洋现场观测设备,应用越来越广泛,但其在复杂天气条件下的观测准确性还需要进一步探讨。因此,为了验证X波段测波雷达对于海洋波浪的观测性能,对安装于我国三亚市三亚湾的X波段雷达设备及布放在该区域的波高仪进行了海浪比测试验,通过对压力测波与X波段雷达测波两种不同探测机制在不同海况下实际海浪观测数据结果的分析可以得出：X波段雷达对于海浪观测的结果较为理想,与压力测波结果相关性较高,在不同天气条件下,均能够准确地反演大范围海域的海浪信息。根据研究结果,X波段雷达的波浪现场观测数据完全可以达到海洋环境监测的要求。 相似文献
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山东半岛北部海洋动力环境的高频地波雷达观测 总被引：1，自引：0，他引：1
利用两台高频地波雷达(ground wave radar,WERA)站对山东半岛北部雷达覆盖海区的浪、流场进行了观测,并且利用海洋-大气-波浪耦合沉积输运模型(coupled-ocean-atmosphere-wave-sediment transport modeling system,COAWST)对该区域的一个强风暴过程进行了数值模拟,对雷达观测数据、现场声学多普勒流速剖面仪(acoustic Doppler current profilers,ADCP)调查数据和数值模拟结果进行比对分析发现,模型模拟的水位变化与ADCP测量结果一致,WERA所观测到的有效波高和ADCP结果比较吻合,模型模拟的ADCP站位的流速相位、大小与雷达观测结果比较接近,与ADCP的结果有一定偏差。雷达观测的海区流场结果与模型反映趋势基本一致,但是在近岸方向上变化较大,其原因可能与ADCP的投放位置、模型的分辨率设置等因素有关。高频地波雷达系统是海岸带动力环境观测的一个有效工具,在实际应用中有着广泛的前景。 相似文献
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Dong Jiing Doong Shen Hsien Chen Chia Chuen Kao Beng Chun Lee Sun Pei Yeh 《Ocean Engineering》2007,34(2):234-246
Field oceanographic and meteorological data are required for ocean engineering. In response to the requirement of field data, an operational coastal ocean monitoring network was established around Taiwan coast, including nine deep-water data buoys, one shallow-water pile station, 10 coastal weather stations and 10 tide stations. Data quality check procedures are necessary to ensure the accuracy of measurements. This paper presents the data quality check procedures on ocean wave data which includes automatic and manual check procedures. The checking criteria are derived using statistical theory in this paper. In addition, a sea-state-dependent algorithm is presented in this study in order to derive checking criteria of time-continuity check. It is showed to have better performance of picking up suspicious data than using fixed threshold process. This data quality check program is now used on the operational monitoring network. 相似文献
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Use of nautical radar as a wave monitoring instrument 总被引：2，自引：0，他引：2
Common marine X-Band radars can be used as a sensor to survey ocean wave fields. The wave field images provided by the radars are sampled and analysed by a wave monitoring system (called WaMoS II) developed by the German research institute GKSS. This measuring system can be mounted on a ship, on offshore stations or at coastal locations. The measurement is based on the backscatter of microwaves from the ocean surface, which is visible as ‘sea clutter' on the radar screen. From this observable sea clutter, a numerical analysis is carried out. The unambiguous directional wave spectrum, the surface currents and sea state parameters such as wave periods, wave lengths, and wave directions can be derived. To provide absolute wave heights, the response of the nautical radar must be calibrated. Similar to the wave height estimations for Synthetic Aperture Radars, the so-called ‘Signal to Noise Ratio' leads to the determination of the significant wave height (HS). In this paper, WaMoS II results are compared with directional buoy data to show the capabilities of nautical microwave radars for sea state measurements. 相似文献
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All ocean wave components contribute to the second-order scattering of a high-frequency (HF) radio wave by the sea surface. It is therefore theoretically possible to estimate the ocean wave spectrum from the radar backscatter. To extract the wave information, it is necessary to solve the nonlinear integral equation that describes the relationship between the backscatter spectrum and the ocean wave directional spectrum. Different inversion techniques have been developed for this problem by different researchers, but there is at present no accepted “best” method. This paper gives an assessment of the current status of two methods for deriving sea-state information from HF radar observations of the sea surface. The methods are applied to simulated data and to an experimental data set with sea-truth being provided by a directional wave buoy 相似文献
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P. Izquierdo C. Guedes Soares J. C. Nieto Borge G. R. Rodríguez 《Ocean Engineering》2004,31(17-18):2209-2225
Nautical radar and scalar buoy measurements of ocean wind generated waves have been analysed to compare the spectral parameters estimated from both sensors. The time series of different sea-state parameters and the differences and ratios of the values obtained from radar and buoy data using different analysis methods are compared. It has been observed that main differences between the sea-state parameters derived by using measurements obtained from both sensors result both from device characteristics and from the method of spectral estimation. In particular, it is shown that the Nyquist frequency has an important effect on the value of the sea-state parameters depending on spectral moments of order higher than zero. 相似文献
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An overview of developments and applications of oceanographic radar networks in Asia and Oceania countries 总被引：1，自引：0，他引：1
Satoshi Fujii Malcolm L. Heron Kuh Kim Jian-Wu Lai Sang-Ho Lee Xiangbai Wu Xiongbin Wu Lucy R. Wyatt Wen-Chang Yang 《Ocean Science Journal》2013,48(1):69-97
More than 110 radar stations are in operation at the present time in Asia and Oceania countries, which is nearly half of all the existing radar stations in the world, for purposes related to marine safety, oil spill response, tsunami warning, coastal zone management and understanding of ocean current dynamics, depending mainly on each country’s coastal sea characteristics. This paper introduces the oceanographic radar networks of Australia, China, Japan, Korea and Taiwan, presented at the 1st Ocean Radar Conference for Asia (ORCA) held in May 2012, Seoul, Korea, to share information about the radar network developments and operations, knowledge and experiences of data management, and research activity and application of the radar-derived data of neighbouring countries. We hope this overview paper may contribute as the first step to promotion of regional collaborations in the radar observations and data usages and applications in order to efficiently monitor the coastal and marginal sea waters along the western Pacific Ocean periphery. 相似文献
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D. V. Ivonin V. A. Telegin P. V. Chernyshov S. A. Myslenkov S. B. Kuklev 《Oceanology》2016,56(4):591-600
We present the results of development and testing of a coastal X-band radar system for monitoring wind waves and currents at the Black Sea (near Gelendzhik) created on the basis of nautical radars. Radar measurements of wave heights were validated by data from a wave buoy and a moored acoustic Doppler current profiler (ADCP). The conditions for successful radar measurements of waves in the coastal environment have been determined. It was shown that a radar with an aperture 1° could successfully measure wave heights at a distance of 1.2 km from the radar, when waves arrive at an angle of ±31° to the main sensing direction. In this case, for wave height measurements, the correlation coefficient between the radar and independent data is 0.82 and the standard deviation is 0.26 m. 相似文献
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Khan R. Gamberg B. Power D. Walsh J. Dawe B. Pearson W. Millan D. 《Oceanic Engineering, IEEE Journal of》1994,19(4):540-548
Northern Radar's Cape Race Ground Wave Radar (GWR) system became operational in the fall of 1990. The radar facility has the potential to provide surveillance of over 160000 square kilometres of the Grand Banks off Newfoundland, from a coastal station. GWR is a multipurpose sensor capable of detecting ships, monitoring icebergs and sea-ice, and measuring surface currents and sea state. The radar system employs a frequency modulated interrupted continuous wave (FMICW) as the transmit waveform. This waveform uses a pulse compression technique that combines good range resolution and high maximum range with a relatively high duty cycle. In this paper, we describe the implementation of the FMICW waveform in a practical real time radar system. We also show some examples of vessel, iceberg, acid aircraft detection and tracking using the Cape Race facility. These examples demonstrate that the Cape Race GWR may be used as an effective tool to assist in the management, surveillance, and enforcement of Canadian interests in the Exclusive Economic Zone 相似文献
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作为一种高技术监测手段,海洋浮标可实现现场自动监测而不受恶劣海况的影响,近年来得到了广泛的重视和快速发展。文中介绍了浙江近岸海域海洋水质监测浮标的结构设计和自动监测实现。浮标设计为生态浮标、海滨浮标和专项浮标3种类型,由浮体、标架、供电设备、防护设备、锚系、传感器、数据采集传输、电子/电池舱、岸站接收系统等9个部分组成。浮体设计为圆饼形,浮体下方正中安装稳定锤以保证具备足够的稳定性。供电设备由太阳能电池板、大容量蓄电池组成,可保障海上30 d连续阴雨天气、恶劣海况下的不间断供电。浮标经喷防污漆、牺牲阳极保护、裹铜皮、加过滤网和人工清除等5种方法防腐、防污处理后投放入海,采用常规维护、应急维护和年度维护等3种方式保障浮标系统运行稳定。投放后可实现对标浮所在海域水质、气象、生态等参数的连续、实时、自动监测。最后对浮体直径设计和浮标投放点选址提出了建议和要求。该设计可为其它类似区域的水质监控提供良好的参考。 相似文献
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基于X波段微波雷达的近海水深数值模拟与反演 总被引：2，自引：2，他引：0