共查询到15条相似文献,搜索用时 372 毫秒
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就压力式验潮仪观测数据的预处理、仪器改正、海水密度改正、滤波光滑处理等方法进行了探讨。对由于仪器原因或因缺电造成的缺损数据的修复,首次提出了利用调和相关差分的方法进行数据的恢复,这种方法还可以用于海底自容压力式验潮仪的沉降检测和改正。经过分析比对,此次渤海航路测量水位改正的均方差优于10 cm,证明这些潮汐数据分析处理方法合理可靠。 相似文献
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新型拖缆式便携验潮仪 总被引:2,自引:4,他引:2
研制了一种新型拖缆式便携验潮仪。通过采用高精度绝对压力变送器、数字滤波采样、多点标定减少传感器误差等设计方法,稳定储存与传送水位数据,提高了观测精度。介绍了该型验潮仪的工作原理、技术途径、特点和应用方法。 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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针对目前传统抛投验潮仪及常规GNSS方法在海洋倾倒区水位测量中存在的问题,提出了基于星站差分技术的海洋倾倒区水位测量的思路,对OmniSTAR系统进行收敛时间及高程精度测试,并在营口、锦州倾倒区进行应用试验。结果表明,OmniSTAR系统经过25 min收敛,高程定位精度能够达到厘米级;OmniSTAR水位测量结果与验潮仪水位保持了较好的一致性,锚定状态下的水位测量结果优于在航水位,在2级海况下,精度能够达到一般精度指标要求,验证了星站差分系统在海洋倾倒区水位测量的可行性,达到3级海况时,在航水位存在误差较大情况。 相似文献
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The sea surface heights (SSHs) observed by the TOPEX altimeter are compared with tide gauge data at Chichijima in Ogasawara (Bonin) Islands and hydrographic data taken around the islands, in order to quantitatively verify the altimeter observations and oceanic tide corrections by three tide models proposed by Cartwright and Ray (1991), Rayet al. (1994), and Maet al. (1994). First, performance of the new tide models is assessed by comparing tidal variations consisting of diurnal and semi-diurnal constituents with the tide gauge data at Chichijima. The tide model proposed by Rayet al. gives the smallest root-mean-squared (rms) difference of 2.61 cm. Errors in amplitude and phase in each tide model are evaluated by spectral analysis. The TOPEX SSHs corrected by the tide models are compared with sea level data at Chichijima. A long-term variation of a period of about 1 year is found in the residual between the SSHs and the Chichijima sea levels. This variation is also found in the difference between the dynamic height anomalies calculated from hydrographic data around the island and the Chichijima sea levels. By subtracting the long-term variation, the rms difference between the TOPEX SSHs and the Chichijima sea levels is reduced to about 4 cm and the slope of the regression line is improved to unity. The residual shows variations related to aliasing caused by incompleteness of the ocean tide correction with the repeat cycle of the altimeter observation. 相似文献
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Seasonal variation of the current in the Tsushima Strait deduced from ADCP data of ship-of-opportunity 总被引:1,自引:0,他引:1
The ADCP data obtained in the Tsushima Strait in the period from February 1987 to November 1990 on board twelve patrol vessels and one research vessel belonging to Maritime Safety Agency was analyzed. Total amount of the data is 200,053, but after quality check, we used 158,401 data for the analysis of the current field and its variability in the strait. The seasonal variation of the currents had been believed to be large. However, no direct current observation throughout the season had been made, and the knowledge on the seasonal variation was derived indirectly from the data of the sea level difference across the strait and of the density field given by hydrographic observations. ADCP data indicates that the seasonal variation of the current field is considerably small in all sub-regions. In the relatively strong current region to the west of the Tsushima Island, the northeast current component has maximum value in the early winter season. 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