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SSA1—1型声学水位计在三峡陡山沱水位站的比测试验 总被引：1，自引：0，他引：1
本文报道ＳＳＡ１－１型声学水位计在长江三峡陡山沱水位站所作的比测试结果，介绍了比测资料的处理及由此得出的初步结论，结果，表明，该仪器所测得的水位过程曲线与上、下游站的水位过程曲线相关性良好，证明了该仪器测量水位的可靠性。 相似文献
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本文介绍了长江口区水文泥沙概况，举例说明了ＳＳＡ１－１型声水位计在崇头潮位站比测试验和投产应用情况，结果表明该水位计是收集长江口区潮位资料较理想的仪器。 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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《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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海洋观测仪器是实施海洋观测活动的基础,其性能影响海洋观测数据的准确性和海洋观测活动的质量。按照不同观测平台对海洋观测标准体系进行分类,梳理了海洋观测要素及其仪器有关的基本参数; 根据海洋观测活动的特点列出了海洋观测仪器的一般技术要求,有助于推进海洋观测仪器应用的标准化工作。 从海洋观测仪器的检定校准和现场比测 2 方面整理了海洋观测数据的质量控制方法,为提高海洋观测数据质量提供支撑。 相似文献
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ＭＣＳ－５１单片机在智能仪器、仪表、数据采集及测量等领域中的应用日益广泛。它具有集成度高、系统结构紧凑、价格低廉等特点。但是它的内存空间与系统机相比较小。在某些海洋水文观测应用领域，如石油平台自动气象数据采集系统，水库大坝水位自动监测系统等需连续工作数月甚至１ａ以上，数据采集时间长、参数多、数据量大，ＭＣＳ－５１单片机的内存空间显然就不够用，必须把ＭＣＳ－５１单片机采集的原始数据传输到ＰＣ机中去，以便ＰＣ机进行大容量的数据存贮和做进一步的数据处理。本文介绍一种简便的接口电路及编程方法，能够方便地… 相似文献
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东海黑潮区域水位的低频变化 总被引：1，自引：0，他引：1
在世界大洋的海流观测中,黑潮是取得资料最多的区域之一。但是,一旦涉及其时间变化时,仍感资料缺乏。为补充水文观测资料的不足,不少科学工作者对海流附近沿岸水位资料进行了分析、利用。通过研究,初步确认海流的变化与沿岸水位的变化密切相关。这就为研究海流变异提供了方便的途径。 相似文献
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本文介绍ＳＣＡ６－１型声学水位计的测量原理与关于仪器安装方法所引起的水位测量误差的研究，并简述了外保护管井的设计及使用中应注意的问题。 相似文献
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The scarcity of tide gauges in a global scale and the variability of the tidal levels along contiguous coasts mainly due to changing hydrographic conditions make the determination of tidal levels, especially of the Mean Sea Level, not an easy task. Determination of such levels with a precision of about 10 cm, necessary for most coastal engineering works, is usually based on records of temporary tide gauges or on geomorphological techniques. In this paper we present an alternative approach permitting to accurately identify tidal levels with a precision suitable for civil engineering applications based on biological observations on rocky shores, including breakwaters and quays. More specifically, we present evidence that the biological zonation, i.e. the distribution of coastal species in well-defined sub-horizontal belts, is practically insensitive to seasonal and other small-scale fluctuations of the sea level and is clearly related to certain levels, mostly the Mean Low Water (MLW). This approach, somewhat similar to what has been used in the past (for instance for the determination of the geodetic vertical datum in the Republic of Venice, Italy, till approximately AD 1800), permits direct determination of the Mean Sea Level or of other tidal levels on the basis of biological observations without statistical analyses of tide-gauge records with an accuracy of 5–10 cm, especially in microtidal, low-energy coasts. 相似文献
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Tide gauges distributed all over the world provide valuable information for monitoring mean sea level changes. The statistical models used in estimating sea level change from the tide gauge data assume implicitly that the random model components are stationary in variance. We show that for a large number of global tide gauge data this is not the case for the seasonal part using a variate-differencing algorithm. This finding is important for assessing the reliability of the present estimates of mean sea level changes because nonstationarity of the data may have marked impact on the sea level rate estimates, especially, for the data from short records. 相似文献
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Tide gauges distributed all over the world provide valuable information for monitoring mean sea level changes. The statistical models used in estimating sea level change from the tide gauge data assume implicitly that the random model components are stationary in variance. We show that for a large number of global tide gauge data this is not the case for the seasonal part using a variate-differencing algorithm. This finding is important for assessing the reliability of the present estimates of mean sea level changes because nonstationarity of the data may have marked impact on the sea level rate estimates, especially, for the data from short records. 相似文献
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A New Methodology for Incorporating Tide Gauge Data in Sea Surface Topography Models 总被引：1，自引：0，他引：1
As part of the Vertical Offshore Reference Frames (VORF) project sponsored by the U. K. Hydrographic Office, a new model for Sea Surface Topography (SST) around the British Isles has been developed. For offshore areas (greater than 30 km from the coast), this model is largely derived from satellite altimetry. However, its accuracy and level of detail have been enhanced in coastal areas by the inclusion of not only the 60 PSMSL tide gauges with long-term records around the coasts of the United Kingdom and Ireland but also some 385 gauges established at different epochs and for different observation spans by the U. K. Admiralty. All tide gauge data were brought into a common reference frame by a combination of datum models and direct GPS observations, but a more significant challenge was to bring all short-term sea level observations to an unbiased value at a common epoch. This was achieved through developing a spatial-temporal correlation model for the variations in mean sea level around the British Isles, which in turn meant that gauges with long-term observation spans could be used as control points to improve the accuracy of Admiralty gauges. It is demonstrated that the latter can contribute point observations of mean sea level (MSL) with a precision of 0.078 m. A combination of least squares collocation and interpolation was developed to merge the coastal point and offshore gridded data sets, with particular algorithms having to be developed for different configurations of coastal topology. The resulting model of sea surface topography is shown to present a smooth transition from inshore coastal areas to offshore zones. Further benefits of the techniques developed include an enhanced methodology for detecting datum discontinuities at permanent tide gauges. 相似文献
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Tide gauge data is important for determining global or local sea level rise with respect to a global geocentric reference frame. Data from repeated precise levelling connections between the tide gauges and a series of coastal and inland benchmarks, including Continuous GPS (CGPS) benchmarks, are used to determine the stability of tide gauges at 12 locations in the South Pacific. The method for determining this stability is based on a constant velocity model which minimises the net movement amongst a set of datum benchmarks surveyed since the installation of the tide gauges. When assessed at a 95% confidence interval, and with the exception of the Solomon Islands, none of the tide gauges were found to be in motion relative to their CGPS benchmarks. The Solomon Islands estimate is considered to be unreliable since the CGPS benchmark was recently established and has been surveyed fewer than three times. In Tonga and Cook Islands, the tide gauges were found to be disturbed or affected by survey errors whereas the Vanuatu results were affected by earthquakes. 相似文献
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本文就ＳＣＡ６－１型声学水位计的可靠性设计与预测做了研究和计算,得出了可靠性指标和可靠性保障技术。这是对产品质量要求必不可少的。本文所使用的方法可为其它产品所借鉴 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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Abstract A project was initiated in 1986 to investigate an apparent significant discrepancy between geodetic and oceanographic leveling determinations of mean sea level around the coast of Great Britain. In oceanographic terms this discrepancy is equivalent to a sea slope in a North‐South direction. The project, which lasted for 3 years, has been carried out in conjunction with research groups at the University of Edinburgh, the Proudman Oceanographic Laboratory, and the Ordnance Survey of Great Britain. It has involved combining Global Positioning System (GPS)‐derived ellipsoidal height differences with a high‐precision geoid, leading to an independent determination of the orthometric heights of tide gauges along the east coast of Great Britain. A major GPS campaign was observed in May 1988. Measurements were made at time gauges between Leith and Lowestoft while simultaneously making measurements at fiducial sites. The results of the 1988 and subsequent campaigns are presented and discussed, and details are given of further observation campaigns to monitor the vertical movement of tide gauges around the coast of Britain by GPS. 相似文献