GPS数据采集技术及其在海洋调查中的应用   总被引：1，自引：0，他引：1  

邱雨生  陈敏  刘广山 《台湾海峡》2003,22(3):354-359

本文应用VB6．0开发了智能化的GPS数据采集软件．对该软件的功能进行了简单的介绍，同时对一些关键技术作了较详细的描述。利用该软件、GPS接收机及PC机的组合，可对走航式测量仪器(或移动设备)进行实时定位并保存定位记录，且大大减少一些不必要的数据，使得软件更为实用。  相似文献   

Seasonal dynamics in pelagic fish abundance in a Baltic Sea coastal area     

T. Axenrot  S. Hansson 《Estuarine, Coastal and Shelf Science》2004,60(4):541-547

The spring-spawning Baltic Sea herring spawn in coastal areas that also serve as nursery areas for the young fish during their first summer. In a bay known as a herring spawning and nursery area, the pelagic fish abundance was quantified using hydroacoustics every second week from late spring to autumn in 2000 and 2001. A dense system of survey transects allowed determination of the acoustic index (the nautical area scattering coefficient) for fish abundance with high precision. The variation, expressed as the geostatistical coefficient of variation, was on average 5% both years and ranged from 3–11% (2000) and 3–8% (2001). Through the hydroacoustic data intra-annual dynamics in acoustic fish abundance, densities and size composition could be followed, which showed similar trends in both years. In spring and early summer acoustic fish densities were low, followed by a drastic, 20-fold increase in late summer. Hydroacoustic data and biological samples suggest that the increase was caused mainly by the recruitment of young-of-the-year herring to the acoustically assessable pelagic fish community. This age class is commonly not well represented in catches when using traditional sampling gears such as gill nets and trawls, and hydroacoustics may help to improve quantitative estimates of small juvenile fish in order to increase the understanding of biological processes in coastal nursery areas.  相似文献   

Seakeeping assessment of fishing vessels in conceptual design stage     

Ayla Sayli  Ahmet Dursun Alkan  Radoslav Nabergoj  Ayse Oncu Uysal   《Ocean Engineering》2007,34(5-6):724-738

The main idea of this paper is to identify functional relations between seakeeping characteristics and hull form parameters of Mediterranean fishing vessels. Multiple regression analysis is used for quantitative assessment through a computer software that is based on the SQL Server Database. The seakeeping attributes under investigation are the transfer functions of heave and pitch motions and of absolute vertical acceleration at stern, while the ship parameters influencing motion dynamics have been classified into two groups: displacement (Δ) and main dimensions (L, B, T), coefficients that define the details of the hull form (C_WP, C_VP, LCB, LCF, etc.).Four multiple regression models having different parameter combinations are here investigated and discussed, giving way to the so-called ‘Simple Model’, ‘Intermediate Model’, ‘Enhanced 1 Model’ and ‘Enhanced 2 Model’. The obtained results are more than satisfactory for seakeeping predictions during the conceptual design stage.  相似文献   

Reliability-based comparative study for mooring lines design criteria     

Alberto Omar Vazquez-Hernandez  Gilberto Bruno Ellwanger  Luís Volnei Sudati Sagrilo   《Applied Ocean Research》2006,28(6):398-406

The characteristic environmental load effect for the design of mooring systems of floating units can be defined by means of three procedures: (a) the one associated to an extreme sea state with a given return period, (b) the worst one from a set of sea states on a contour line associated to a return period or (c) the extreme one based on response statistics for a long-term period. This work presents the result of a reliability-based partial safety factor calibration study for a LRFD mooring line design criteria considering the three approaches mentioned above. The calibration exercise is applied to three FPSOs considering North Sea environmental conditions and different water depths: 200, 800 and 3000 m. The mooring systems investigated take into account mooring lines made up of chains and polyester ropes. It is shown that, among all cases investigated, the design procedure based on the long-term response is the one that presents less scattered reliability indices around the target level.  相似文献   

Design of Mooring System for Oil Storage Vessels     

LI  Wen-long 《中国海洋工程》2003,17(4):541-550

The floating oil storage system has been proposed as a new facility for Strategic Petroleum Reserve (SPR) in China. Mooring is one of the key technologies to ensure the safety, reliability, and performance of the oil storage system. This paper describes the concept, analysis, design and reliability of the mooring system. For mooring system design of these oil vessels, analysis is essential of the behavior of the vessel in connection with mooring facilities of nonlinear resilience. A nonlinear mathematical model for analyzing a moored vessel is established and solved. Some results of numerical simulations are presented. Assessment of the safety regarding the mooring system in terms of failure probability is carried out. Another simulation model for calculating the failure probability of the mooring system is proposed. The design parameters that have an influence on the characteristics of the failure probability have been identified. The simulation results show that the mooring system has an annual reliab  相似文献   

水下滑翔机器人运动分析与载体设计   总被引：4，自引：0，他引：4  

张奇峰  俞建成  唐元贵  李硕  张艾群 《海洋工程》2006,24(1):74-78,85

水下滑翔机器人是一种新型水下机器人,具有噪声低、航行距离远、续航时间长、成本低等特点。分析了水下滑翔机器人的驱动机理和运动实现,给出了水下滑翔机器人典型运动的仿真结果,并以正在设计的一水下滑翔机试验样机为研究对象,描述了样机的整体结构布局,详细研究了浮力调节机构、俯仰调节机构和横滚调节机构的实现方法,并就样机中各执行机构的设计实现进行了论述。  相似文献   

絮凝法强化大生活用海水一级处理研究   总被引：3，自引：0，他引：3  

张雨山  王静  寇希元  单科 《海洋技术学报》2002,21(4):57-60

研究了无机絮凝剂石灰、硫酸铝、聚合氯化铝、聚合硫酸铁和氯化铁单独使用及其与有机高分子絮凝剂聚丙烯酰胺（PAM）配合使用时强化大生活用海水一级处理的效果，结果表明，无机絮凝剂与有机絮凝剂配合使用时有很好的强化效果，COD去除率最高达61%，且对SS和BOD也有一定的去除效果。  相似文献   

唐山南堡开发区排污海域沉积物中重金属含量的调查研究     

陈爱萍  尹毅  秦学祥  仲维妮 《海洋科学进展》1997,(2)

本文从唐山南堡开发区污水排海工程建设的需要出发，对排污海域沉积物中Ｃｕ，Ｐｂ，Ｃｄ，Ｈｇ，Ｚｎ和Ｃｒ６种重金属的含量及分布特征进行了调查研究，为污水排海工程的建设及开发区沿海海洋环境保护提供了基础性研究资料。  相似文献   

凡纳对虾(Litopenaeus vannamei)溞状幼体黏脏病的治疗     

梁华芳 《海洋湖沼通报》2004,(1):28-31

用不同药物治疗凡纳对虾状幼体黏脏病 ,结果表明 :用浓度为 3× 10 - 6 养虾丹、混合施用 0 .15× 10 - 6 次氯酸钠 + 1.5mg/L土霉素或 0 .0 1× 10 - 6 的亚甲基蓝 + 1.5mg/L土霉素可治疗凡纳对虾幼体黏脏病  相似文献   

基于麦克斯韦理论的海底大地电磁探测技术   总被引：1，自引：0，他引：1  

邓明  沈高山  余平  邓靖武 《海洋技术学报》2003,22(2):44-47

麦克斯韦理论为海底大地电磁探测技术奠定了坚实基础。大地电磁场的测量通常测取Ex，Ey，Hx，Hy,Hz。大地电磁仪的设计要点包括：高灵敏度、智能化、同步采集数据、锚系硬连接、承压密封和合理的下沉速度所观测的数据经计算机处理后，可获得被测海域的地球物理信息。  相似文献