共查询到19条相似文献，搜索用时 187 毫秒
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为了解决浮子式水位计（以下简称浮子水位计）由工作人员定时到潮位观测场校准的工作问题，提高校准准确度，设计了基于图像识别与远程校准的潮位观测系统。该系统依靠在潮位观测场搭载摄像机拍摄目标，采集井内水尺图像，并通过4G、5G通讯将井内水尺视频图像和浮子水位计观测的数据传输至数据中心。数据中心管理软件通过对水尺图片进行图像识别获取井内水尺读数，对井内水尺数据和浮子水位计观测的潮位数据进行对比分析，计算系统不确定度、随机不确定度、综合不确定度，当综合不确定度大于规范误差时，系统不确定度作为漂移量发送给浮子水位计，实现浮子水位计的远程自动校准。经示范应用验证，系统功能性能指标满足业务化运行需求。 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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水尺与压力式水位计数据关系的算法研究 总被引：1，自引：0，他引：1
针对海道测量中在同一验潮点人工水尺与压力式水位计同步水位观测所得不同的潮位数据,分别绘制潮位曲线,从两条相关的曲线数据中应用三次样条和拟合数学函数模型,利用计算机程序确定曲线间的线性关系,从而根据压力式水位计测得的数据确定的关系得出真实的潮位数据。 相似文献
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为了证明雷达水位计波高测量的有效性,基于PY30-1石油平台上的雷达水位计海面高度变化观测数据,开展了雷达水位计海浪波高信息提取算法研究。基于所发展算法提取海浪波高信息,与同一平台上的C波段测波雷达观测数据及平台附近的浮标观测数据进行了比对分析。结果表明,雷达水位计数据提取的海面波高数据与C波段测波雷达及浮标测量数据一致性较好,二者标准偏差分别为0.006和0.008 m,均方根误差(RMS)分别为0.55和0.60 m。波高小于4 m时一致性优于波高大于4 m的一致性,波高大于4 m时水位计提取的波高偏小。因此,雷达水位计可作为波高观测的重要数据源之一。 相似文献
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WL-03型精密气泡式水位(潮位)计 总被引：1，自引：0，他引：1
WL-03型精密气泡式水位(潮位)计是目前世界上正在开始采用的新一代的水位(潮位)测量仪器。WL-03型精密气泡式水位计是由哈尔滨万达华科技发展有限公司会同美国通用技术公司及英国林创公司联合研制的。该仪器设计先进，测量精确度高，工作性能稳定可靠、操作方便。可广泛应用于江河湖海及水库、灌渠、地下水等领域的水位测量。特别适用于航运交通、水利水文、海洋台站等部门的水位环境监测。仪器外形图见图1。 相似文献
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本文主要介绍了WLR—5型水位计的记录数据、水位计算公式及有关各参量的观测计算;在进行水位计算时,本文提出了重力加速度要进行纬度订正;并列举了应用实例。 相似文献
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水位是江，河，湖，海水势变化的标志，水位观测是水文测验中最基本的项目之一，而水位观测仪器的质量，性能直接关系到水文资料的收集及其成果质量，因此，选择水位观测仪器至关重要，它直接关系到资料收集的连续性和成果质量的可靠性，对于实现水文技术现代化有着十分重要的意义，本文对长江口区各潮位站自记水位计的工作原理，可靠性，资料精度进行了分析评价，在此基础上，提出选用水位观测仪器的参考意见。 相似文献
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The long-term variation and seasonal variation of sea level have a notable effect on the calculation of engineering water level. Such an effect is first analyzed in this paper. The maximal amplitude of inter-annual anomaly of monthly mean sea level along the China coast is larger than 60 cm. Both the storm surge disaster and cold wave disaster are seasonal disasters in various regions, so the water level corresponding to the 1% of the cumulative frequency in the cumulative frequency curve of hourly water level data for different seasons in various sea areas is different from design water level, for example, the difference between them reaches maximum in June, July and August for northern sea area, and maximum in September, October and November for Southern China Sea. The hourly water level data of 19 gauge stations along the China coast are analyzed. Firstly, the annual mean sea level for every station is obtained; secondly, linear chan ging rates of annual mean sea level are obtained with the stochasti 相似文献
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This paper attempts to assess the use of Global Navigation Satellite System (GNSS) as an accurate, reliable, and easy tool for sea level measurement. The GNSS technique was incorporated into a float based tide gauge system. A prototype of such an instrument was developed based on principles of conventional tide gauges, where high frequency noise is reduced mechanically. The ability of the GNSS based tide gauge (GTG) to monitor sea levels was tested in several experiments. The performance of the GTG was compared to that of a traditional tide gauge. The method of data analysis and data comparison between the GPS measurements and the tide gauge data is presented. The results show that the GTG is equal in performance to the traditional float operated tide gauge. It seems that the GTG is capable of delivering the same level of accuracy (1 cm), and its results are as reliable as its competitor, the traditional float tide gauge. The suggested instrument can be easily integrated into the array of permanent GNSS stations and assist in absolute measurements of sea level changes, caused by global warming and the greenhouse effect, for example. 相似文献
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This paper attempts to assess the use of Global Navigation Satellite System (GNSS) as an accurate, reliable, and easy tool for sea level measurement. The GNSS technique was incorporated into a float based tide gauge system. A prototype of such an instrument was developed based on principles of conventional tide gauges, where high frequency noise is reduced mechanically. The ability of the GNSS based tide gauge (GTG) to monitor sea levels was tested in several experiments. The performance of the GTG was compared to that of a traditional tide gauge. The method of data analysis and data comparison between the GPS measurements and the tide gauge data is presented. The results show that the GTG is equal in performance to the traditional float operated tide gauge. It seems that the GTG is capable of delivering the same level of accuracy (1 cm), and its results are as reliable as its competitor, the traditional float tide gauge. The suggested instrument can be easily integrated into the array of permanent GNSS stations and assist in absolute measurements of sea level changes, caused by global warming and the greenhouse effect, for example. 相似文献
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潮间带水沙多层位同步测量系统应用的初步研究 总被引：2，自引：0，他引：2
利用水压、光电转换原理研制成的多层位水沙同步测量系统(WCT系统)不仅可测量潮间带水位随时间的变化系列、同一层位的浊度及流速，还可以同步观测这些参数在潮间带水流剖面不同层位上的变化。野外对比试验表明，WCT系统获得的流速值与直读式流速仪的测量结果基本一致，平均相对误差为14．52％；悬沙传感器经野外现场率定获得悬沙浓度，平均相对误差为21．96％，精度比室内率定提高—倍以上。悬沙粒径是影响悬沙浓度测量精度的主要因素。此外，自然环境(如海水温盐度)的变化及仪器本身的特性也可能影响到测量结果。因此，WCT系统在潮间带的水位、流速和悬沙浓度的观测和边界层研究方面有相当潜力。 相似文献
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A wave-height meter using a simple microwave Doppler radar,simeq10 mW in power and 10.525 GHz in frequency, is proposed so that we can measure oceanic waves effectively while the ship is steaming. It was first applied to the measurement of the variation of water level generated in a wave tank, which suggested that it is adequately applicable to the measurement of oceanic waves. A field test was carried out off the cape of Nojimazaki by installing the Doppler radar 5 m above the sea level at the bow of the ship. The result agreed reasonably well with that measured simultaneously by the ultrasonic wave-height meter installed at the same position. Another test is running successfully on a larger ship with the wave-height meter installed at 9 m above the sea level. The significant wave height measured by the present meter is being compared with that observed visually by the navigation officers. 相似文献
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使用嵊泗站所布设的地波雷达观测获取的径向流数据,以及嵊泗、芦潮港、岱山3个潮汐观测站水位资料,采用两点近似投影方法反演流场全矢量流速,并用T_tide程序计算调和常数,分别计算O1、K1、M2、S2各分潮流速场及迟角场,并计算各点上的潮能通量及潮能耗散,得到嵊泗岛以西杭州湾口区域潮能耗散同地形存在良好对应关系,充分证明了采用地波雷达观测数据进行潮能耗散计算这一方法的可行性,供相关工作者作进一步研究和讨论。 相似文献
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Directional wave information from the SeaSonde 总被引：1，自引：0，他引：1
This paper describes methods used for the derivation of wave information from SeaSonde data, and gives examples of their application to measured data. The SeaSonde is a compact high-frequency (HF) radar system operated from the coast or offshore platform to produce current velocity maps and local estimates of the directional wave spectrum. Two methods are described to obtain wave information from the second-order radar spectrum: integral inversion and fitting with a model of the ocean wave spectrum. We describe results from both standard- and long-range systems and include comparisons with simultaneous measurements from an S4 current meter. Due to general properties of the radar spectrum common to all HF radar systems, existing interpretation methods fail when the waveheight exceeds a limiting value defined by the radar frequency. As a result, standard- and long-range SeaSondes provide wave information for different wave height conditions because of their differing radar frequencies. Standard-range SeaSondes are useful for low and moderate waveheights, whereas long-range systems with lower transmit frequencies provide information when the waves are high. We propose a low-cost low-power system, to be used exclusively for local wave measurements, which would be capable of switching transmit frequency when the waveheight exceeds the critical limit, thereby allowing observation of waves throughout the waveheight range. 相似文献
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《Ocean Modelling》2010,34(3-4):270-282
A set of tools for the statistical assessment of ocean observing networks is presented and applied for the analysis of different instrumentation scenarios in the German Bight. An optimal linear estimator is used to re-construct ocean state parameters from observations taking into account both the prior distribution of the state and measurement errors. The proposed method enables a re-construction of any scalar parameter or vector field with linear relationship to the state. The performance of the observing network is quantified in terms of the re-construction quality. Apart from the capability of the network to provide estimates of state parameters at the time of the observations, the potential of the measurements for forecasts is investigated as well. Furthermore, a generic method to compare single measurements with continuous observations is presented. Finally, a technique is described to quantify the relative importance of different components of an observational network.The proposed methods are applied to water level measurements in the German Bight. A numerical model is used to estimate the background statistics. Synthetic measurements provided by tide gauges, satellite altimeters, and HF radar are considered in the analysis. The estimation of the complete water level field in the German Bight is compared for altimeter and tide gauge measurements. It is shown that the orientation of the satellite track with respect to the coastline is of high relevance. The importance of water level measurements taken in deeper water, e.g., at the FINO-1 platform, is demonstrated. It is shown that continuous tide gauge measurements provide more information on the area mean water level in the German Bight than altimeter observations taken by ENVISAT and JASON-1/2. It is furthermore shown how the information provided by a tide gauge propagates with the Kelvin wave. Implications for the design of an assimilation scheme are discussed. 相似文献