现场多功能定点观测系统     

朱伯荣  王振东 《海洋工程》1997,(3)

现场多功能定点观测系统是为潮汐河口及沿海地区进行水文测验而研制的。它由传感器组件、压力仓、电子电路、数据采集和处理装置等组成。传感器组件有流速、流向、温度、压力、电导率和含沙量等传感器，能测量流速等６种水文参数。该系统的使用既可长期定点锚泊测量，也可短期随船测量。长期锚泊测量能适应恶劣环境。  相似文献   

Ocean bottom tiltmeter with acoustic data retrieval system implanted by a submersible     

Hideki Shimamura  Toshihiko Kanazawa 《Marine Geophysical Researches》1988,9(3):237-254

Sensitive Ocean Bottom Implanted Tiltmeters (OBITs) with a sophisticated data retrieval system have been developed in order to observe directly the subduction of oceanic lithosphere. The OBIT is the first long-term geophysical instrument which was designed to be deployed by a manned deep-sea submersible. When the OBIT is put on oceanic lithosphere which is bending and is about to subduct under a deep sea trench, the OBIT records the subduction by observing the tilt of the surface of the lithosphere. The OBIT system has a sensitivity of 10^-8 radian, which is enough to detect the ongoing subduction in months or years. The OBIT may give an answer to the question whether there are fluctuations in the subduction rate.Two OBITs were successfully deployed on a seaward slope of the Kuril Trench by the newly built French deep submersible, Nautile. The OBITs were installed on the northwest shoulder of Erimo seamount, at a depth of 3930 m, in the Kuril Trench. In order to attain stable long-term observations of crustal deformations, the sensing unit was cemented onto bare rock by mortar. We have not yet had an opportunity to recover the data.The life of the instruments is expected to be more than five years. An acoustic data transmission system has been developed for the OBIT data recovery. The stored data can be retrieved at any moment during the observation period, with no need to retrieve the instruments nor to interrupt the observation, by use of the acoustic system. The acoustic system has a high data transmission rate as well as extremely low power consumption. This will be the first long-term crustal deformation measurement on the sea floor.  相似文献   

基于单片机的海洋要素垂直剖面测量系统的控制电路设计     

郝?? 菁  龚德俊  徐永平 《海洋科学》2007,31(4):5-8

设计了一种基于AT89C2051单片机的海洋要素垂直剖面测量系统(简称“海马”)的控制电路。实验表明,该控制电路实现了“海马”的核心部件——棘爪机构单向抓紧、阻尼锁定和自由上浮3个状态的控制,方法简单新颖,同时实现了“海马”下潜运动的能量全部来自波浪,上浮依靠自身浮力的目标。  相似文献   

A theoretical study of the factors which influence the measurement of fishing netting mesh size     

F. G. O&#x;Neill 《Ocean Engineering》2003,30(16):2053-2063

A theoretical investigation is carried out of the mesh size measurement of an idealized fishing netting mesh. It is assumed that the bending moment of the netting twine is proportional to curvature and that there is no twine extension and no cross-sectional deformation of the twine. The corresponding momentum and force balance equations are analyzed. The measurement method our analysis most approximates is that of the ICES gauge. The effect on mesh measurement of twine bending stiffness, frictional resistance, boundary slope, gauge force and gauge thickness are all examined.  相似文献   

海底DEM结构与精度分析     

崔杨  刘雁春  暴景阳  肖付民 《海洋测绘》2004,24(1):38-41

介绍了DEM的原理与构建方法及其在海底地形表征中的应用，对现有海底DEM的精度进行分析，针对数据传递而引起的精度损失，提出改进方法，即建立基于原始测线的海洋DEM，进行了理论分析并利用实例验证。  相似文献   

重量法测量悬浮物浓度关键技术研究   总被引：6，自引：0，他引：6  

周虹丽  朱建华  韩冰  陈颉 《海洋技术学报》2004,23(3):15-20

悬浮物质含量是水体质量的重要参数，也是遥感的主要产品之一。文章主要对重量法测量悬浮物浓度中的关键技术，包括样品烘干温度、烘干时间、恒重时间和过滤体积进行研究。通过研究得出在重量法测量悬浮物浓度中合适的测量条件和采样条件。  相似文献   

Recognition and Measurement of Marine Topography for Sounding Generalization in Digital Nautical Chart     

Zhai Jingsheng  Lu. Yi 《Marine Geodesy》2005,28(2):167-174

Generalization is a comprehensive process. It is not simply a question of an algorithm, such as simplification, selection, displacement, and so on. Only after geometric shapes and topological properties have been understood fully, can a sound and automated generalization process be possible. This article proposes a new theoretical model for sounding generalization in digital nautical charts. First, with the aid of Delaunay triangulation, a tree structure is introduced for a hierarchical representation of the marine topography. Then, an analytical algorithm for the recognition and the measurement of the marine topography is developed through the use of the tree structure. Finally, all of the techniques mentioned above are integrated into a model for sounding generalization, of which results are illustrated with the aid of several examples.  相似文献   

投放式声学多普勒海流剖面仪的盲区优化和数据处理误差控制     

熊学军  胡筱敏  于非  矫玉田 《海洋技术学报》2006,25(1):107-110,114

为了进一步完善投放式声学多普勒海流剖面仪(LADCP)测量和资料后处理技术,通过海上观测实验和资料分析,优化了盲区长度的设置,改善了第一观测层的资料质量;分析了下放过程和上升过程的不同测量误差,并反馈到对测量过程和资料后处理的质量控制,提出了较完备LADCP测量系统的必要组成。通过和相应的底跟踪结果及走航ADCP观测结果的比对分析,LADCP测量及资料后处理结果的可信性得到了初步验证。  相似文献   

伪卫星独立组网方案研究     

孟键  孙付平  王爱兵 《海洋测绘》2007,27(1):12-16

针对伪卫星独立组网，从精度因子入手，分析了对不同用户的定位精度。着重对空中用户的定位问题进行一系列的分析，并进行了仿真。对仿真过程中遇到的精度衰减因子（DOP）值分布奇异条带、定位精度较低等情况，研究了不同的伪卫星布局和增加卫星数目等解决方案。  相似文献   

Simultaneous vertical measurements of in situ pH and CO2 in the sea using spectrophotometric profilers     

Yoshiyuki Nakano  Hideshi Kimoto  Shuichi Watanabe  Koh Harada  Yutaka W. Watanabe 《Journal of Oceanography》2006,62(1):71-81

We have developed new systems capable of profiling to >1000 m for measuring in situ pH and fugacity of CO₂ (fCO₂) in the ocean using spectrophotometric analysis (pH and CO₂ profilers). The in situ pH is determined by detecting the color change of the pH indicator (m-cresol purple). It can withstand ambient pressure to 1000 m depth. The CO₂ profiler analyzed in situ fCO₂ by detecting the change of pH in an inner solution, equilibrated with the seawater through a gas permeable membrane. It can be operated to 2500 m depth. We used an amorphous fluoropolymer tubing form of AF-2400 for the gas permeable membrane due to its high gas permeability coefficients. The inner solution was a mixture of 2 μM bromocresol purple (BCP) and 5 μM sodium hydroxide. This system gave us a response time of 1 minute, which is twice as fast as previous systems. The precisions of pH and CO₂ profilers were within 0.002 and 2.5% respectively. We have used these profilers to study the North Pacific, obtaining good agreement with the difference between the data from profilers and a discrete bottle of 0.002 ± 0.005 pH (SE, n = 25) and −0.4 ± 3 μatm (SE, n = 31).  相似文献