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研究南海环流的方法很多,采用GDEM资料,运用P矢量方法,得出了南海春季、夏季局部的上层流场分布情况.通过分析并结合UCM-60超声海流计和ADCP走航式测流仪相关实测数据,初步验证了这种研究南海上层季节环流所用的数值计算方法. 相似文献
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声学多普勒流速剖面仪(ADCP)是对海洋内波监测的有效手段,但受到仪器本身和复杂的海洋环境噪声等影响,走航式ADCP记录的海流数据存在大量噪声,且混有流速异常值。为了进一步提高海洋内孤立波的提取精度与准确性,本文针对走航式ADCP海流数据特点引入IGG3方法的权函数因子,设计了一种抗差Vondrak滤波器,并与快速傅里叶变换、小波分析和滑动平均3种传统滤波方法进行对比,以验证抗差Vondrak滤波方法的有效性与优越性。研究结果表明,抗差Vondrak滤波方法不仅可以有效地滤除流速噪声,还可以自适应剔除海流观测数据中的异常值,由其提取出的内孤立波准确且各层水平流速清晰。因此,与传统滤波方法相比,抗差Vondrak滤波方法在内孤立波提取方面具有一定的优越性。 相似文献
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多普勒海流计是根据声学多普勒效应的原理制成的测流仪。它用声波换能器取代了传统的以机械转动为基础的传感器。其量程宽,既可测弱流,又能测强流,测量呈线性,一般情况下精确度较高。多普勒海流计的种类型号很多,有的可安在平台或海底,进行定点测流,有的可装在调查船上,作锚锭浮泊或走航测流。因为它能够测量水体垂直剖面上的各层流速,因此又称它为剖面海流计我国已自行设计出 SLY1-1型声学多普勒海流计,其流向流速测量方法及仪器主要技术指标可参看文献[4]和[5]。多普勒海流计在我 相似文献
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声学多普勒海流剖面仪(ADCP)是最近十几年来迅速发展起来的一种新型海流计.它的最大优点是能同步测量海流的垂直剖面,本文主要介绍我所研制的“声学多普勒剖面海流计”(以下简称为剖面流)的测流原理,系统硬件组成,软件设计以及介绍最近一次的海上比测试验情况。 相似文献
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声学多普勒海流剖面仪(ADCP)是一种能测量三维垂直剖面流的高效仪器。当它固定在调查船上时,得到的海流数据要受到表面波动、螺旋桨的噪音和船壳汲入的漩涡的影响.为此,日本科技人员设计了一种用拖曳式运载体承载ADCP的新系统来测流,以消除上述干扰.这种拖曳式运载体深度和转动可控,拖曳电缆长800m,运载体的长、宽、高分别为2、2、1.5m,重360kg,最大速度为12kn.现场试验表明;这一系统性能优良,测得的数据有良好的精确度。 相似文献
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为解决海流计在实际应用中存在的部分专业术语不规范、译名不统一和归类有差异等问题,促进海洋观测仪器的发展和应用,文章参照相关标准规范、权威专著和专业文献等资料,根据海流计的工作原理和使用性质,结合业界实践经验,系统梳理各类型海流计的命名、分类、适用范围、特点和发展方向等内容。研究结果表明：海流计可定义为“一种用于测量海水流速和流向的仪器”,根据工作原理主要分为机械式海流计、电磁海流计、声学海流计和其他海流计4个大类,不同类型的海流计各具特性;其中,机械式海流计主要包括厄克曼海流计、印刷海流计、照相型海流计、磁录式海流计、遥测海流计和直读式海流计,电磁海流计主要包括地磁场电磁海流计和人造磁场电磁海流计,声学海流计主要包括声学多普勒流速剖面仪、声学多普勒海流单点测量仪、声学多普勒流速仪和时差式声学海流计,其他海流计主要包括激光多普勒测速仪、电阻式海流计、应变片海流计、倾斜式海流计、粒子图像测速仪和海洋湍流剖面仪。 相似文献
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下放式声多普勒海流剖面仪(LADCP)是20世纪90年代出现的一种海流剖面测量方式,能够快速获得大范围、全深度的海流剖面数据,在国内外有很广泛的应用。中科院声学所第一次将声通信部分加入LADCP中,完成了LADCP下放的实时监控。文中介绍了适用于LADCP通信特点的一种基于DS-CDMA的通信方法,完成了理论仿真,并通过进行相应的海试,验证了该方法的有效性。 相似文献
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为完善目前走航ADCP观测资料质量控制尚未形成统一流程的问题,将走航ADCP观测资料质量控制归纳为船速获取、声速校正、偏角校正以及剖面数据处理四个主要步骤,并制定了一套较为系统的走航ADCP观测资料质量控制流程。以渤海辽东湾红沿河核电站周边海域船载走航ADCP观测为例,按照提出的流程进行走航ADCP观测资料的质量控制。通过对比原始观测数据,质量控制后的结果表明u分量流速剔除了23.56%的低可信度数据,而v分量流速剔除了25.96%的低可信度数据。10 m与15 m水深处的质量控制前后的流速-频数直方图表明,本文提出的流程能有效地降低观测随机性的影响。 相似文献
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Comparison of surface current variations observed by TOPEX altimeter with TOLEX-ADCP data 总被引：1，自引：0，他引：1
Variations of surface current velocity derived by the TOPEX altimeter are compared with data from Tokyo-Ogasawara Line Experiment (TOLEX)-Acoustic Doppler Current Profiler (ADCP) monitoring for a period from October 1992 to July 1993. Since the locations of ADCP ship track and TOPEX altimeter ground tracks do not coincide with each other, and the temporal and spatial sampling are also different between the ADCP and altimeter observations, re-sampling, interpolation and smoothing in time and space are needed to the ADCP and altimeter data. First, the interpolated TOPEX sea surface height is compared with sea level data at Chichijima in the Ogasawara Islands. It is found that aliasing caused by the tidal correction error for M2 constituent in the TOPEX data is significant. Therefore, comparison of the TOPEX data with the TOLEX-ADCP data is decided to be made by using cross-track velocity components of the surface current, which are considered to be relatively less affected by the errors in the tidal correction. The cross-track velocity variations derived from the TOPEX sea surface heights agree well with those of the ADCP observations. The altimeterderived velocity deviations associated with transition of the Kuroshio paths coincide with the ADCP data. It is quantitatively confirmed that the TOPEX altimeter is reliable to observe the synoptic variations of surface currents including fluctuations of the Kuroshio axis. 相似文献
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ADCP资料后处理是海流研究过程中的重要环节。为进一步丰富该类型数据的处理思路与处理手段,系统性地介绍了法国海洋开发研究院研发的船载ADCP资料处理软件Cascade7.2,详细阐述了Cascade7.2资料处理的基本流程、思路、主要功能和部分原理,并结合一段实测数据,通过对比国内某同类产品,对该软件开展初步应用。资料处理流程表明,Cascade7.2软件集成了数据处理、成图和参数校正等功能,采用问题数据标记的方式,有效避免数据误删;处理结果表明该软件使用了加权三点滑动平均方式进行滤波,提升了资料处理效率,但在数据平滑性上略差。 相似文献
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CODAS系统搭配相应质量控制参数,用以识别ADCP在复杂测流环境下测得的可疑或错误流速单元和剖面.通过水跟踪和底跟踪,CODAS系统可有效获取仪器自带数据处理软件vmdas、winriver无法修正的系统误差.本研究采用该系统对厦门湾走航ADCP测量数据做后续质量控制,所得相应系统误差如下：旋转角度偏差ΔФ=3.2°,幅值修正因子β=0.98.此外,以底跟踪测得流速为准确值,参考GPS数据经过系统误差订正后,流速精度显著提高,平均误差订正前后分别为28.9cm/s和11.6 cm/s.最后,结合现场数据采集工作与数据质量控制过程,总结数据质量问题一般特征并提出改进建议. 相似文献
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虚拟现实（VR）是典型的军民融合技术，在军民装备保障业务中应用广泛，可让用户熟练掌握高价值装备的操作和维修规程。为满足近年来国内海洋系统大量引进声学多普勒流速剖面仪（ADCP）装备在计量检定和维护保养等方面的迫切需求，文章从VR的技术定义和系统组成出发，总结ADCP国内计量检定和使用维护等保障工作的现状，并详细探讨利用VR技术构建ADCP仿真保障系统在ADCP保障业务中的可能应用和潜在价值，为我国ADCP保障业务的发展提供建议。 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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A method has been developed to monitor the surface velocity field by combining repeated acoustic Doppler current profiler
(ADCP) observations and satellite altimetry data. The geostrophic velocity anomaly is calculated from the sea surface height
anomaly field estimated from the altimetry data by an optimal interpolation. It has been confirmed that this accurately observes
the smoothed velocity anomaly field when the interpolation scales are set according to the spatio-temporal sampling pattern
of the altimeter used. The velocity anomaly obtained from the altimetry data is subtracted from the repeated ADCP observations
to estimate temporal mean velocity along the ship tracks. Regularly sampled, nine-year time series of surface velocity can
then be obtained by adding the computed mean velocity and the altimetry anomaly components. This clearly illustrates surface
velocity fluctuations such as the movement of the Kuroshio axis due to its meandering and an increase of the interannual variability
of the Subtropical Countercurrent toward its downstream region.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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ADCP application for long-term monitoring of coastal water 总被引：3，自引：1，他引：2
Three kind of application of ADCP is reported for long-term monitoring in coastal sea. (1)The routine monitoring of water qualities. The water quality and ADCP echo data (600 kHz) observed in the long-term are analgzed at MT (Marine Tower) Station of Kansai International Airport in the Osaka Bay, Japan. The correlation between the turbidity and echo intensity in the surface layer is not good because air bubbles generated by breaking wave are not detected by the turbidity meter, but detected well by ADCP. When estimating the turbidity consists ofplankrton population from echo intensity, the effect of bubbles have to be eliminated. (2) Monitoring stirring up of bottom sediment. The special observation was carried out by using following two ADCP in the Osaka Bay, One ADCP was installed upward on the sea. The other ADCP was hanged downward at the gate type stand about 3 m above from the bottom. At the spring tide, high echo intensities indicating the stirring up of bottom sediment were observed. (3) The monitoring for the boundary condition of water mixing at an estuary. In summer season, the ADCP was set at the mouth of Tanabe Bay in Wakayama Prefecture, Japan. During the observation, water temperature near the bottom showed remarkable falls with interval of about 5～7d. When the bottom temperature fell, the inflow current with low echo intensity water appears at the bottom layer in the ADCP record. It is concluded that when occasional weak northeast wind makes weak coastal upwelling at the mouth of the bay, the combination ofupwelling with internal tidal flow causes remarkable water exchange and dispels the red tide. 相似文献