系泊方柱在畸形波与波群伴生波浪作用下运动响应试验研究

畸形波与波群伴生波浪作用于系泊浮体,和常规随机波浪作用比较,运动响应时频域特征均将发生显著变化。基于物理模型试验,采用小波方法计算伴生波浪和常规随机波浪作用下系泊浮体运动响应的时频域特征变化及波群因子与浮体运动响应时频域特征的定量关系。结果表明:伴生波浪作用下浮体运动响应显著大于常规随机波浪的作用结果,且波群因子G A对浮体运动响应时频域特征有显著影响;伴生波浪作用下浮体纵荡运动的广义能量谱E(t)统计特征值E max(t)、E 1/10(t)、E 1/3(t)、E average(t)均明显大于相同波谱下常规随机波浪的结果,且随着波群因子G A增大显著增大;伴生波浪作用下各运动响应能量集中度δE显著大于常规随机波浪作用结果,且能量集中时域分布范围参数ΔT E以纵荡运动分量最为显著。     

海底管线附近抛锚时锚链的设计

当船只抛锚点附近有海底管线时,为了防止置于海底的锚链对管线可能造成的危害.需要采取一定的措施将位于海底管线上方的锚链提起.结合实际工程设计采用浮筒提供足够的举升力提起锚链,并以悬链线方程为依据,推导浮筒位置和高度对锚链形状和被举升段长度的关系,从而确定出合理的浮筒举升力大小和浮筒安装位置.     

Nearshore directional wave measurements by surface-following buoy and acoustic Doppler current profiler

Directional energy spectra of nearshore surface waves were measured for a 3-year period (2004–2007) at a site with mean depth 14 m and mean tidal range 2.1 m. Triaxys surface-following wave buoys reported hourly directional wave energy spectra and wave parameters near the offshore end of the Savannah River Entrance Channel, Georgia, USA. An acoustic Doppler current profiler (ADCP) was located beside the wave buoy for 3 months. Directional and non-directional surface wave energy spectra and the corresponding bulk wave parameters (height, period, and direction) are compared for the two systems. Most parameters derived from the spectra agree closely; the most significant differences were found at the upper and lower frequency measurement limits, where signal-to-noise ratios were lower. The wave buoy consistently reports a small amount of energy below 0.05 Hz that does not appear in the ADCP-derived spectra and does not appear to be related to the mooring system. This leads to larger mean and peak periods reported by the buoy. All directional spectra were computed using the Maximum Entropy Method for both instruments, but the buoy, with spectra derived from six independent time series, provides lower directional resolving power than the ADCP, which utilizes twelve time series. Both systems gave similar results defining mean and peak wave directions, with the primary difference being that the ADCP indicates energy to be more tightly concentrated around the peak direction.     

系缆式剖面测量平台运动性能分析

文章简单介绍了系缆式剖面测量平台的结构构成,围绕剖面测量平台升降运动的工作原理,着重对平台的一些固有的基本特性所产生的影响进行了分析,供有关人员参考交流。     

水面无线自组网装备研发与水动力学监测应用研究

应用窄带物联网技术,研发了一种能够快速构建半径100 km的水面无线网络,并通过投放大量抛弃式带北斗定位的微型浮标,动态采集水动力学数据.该技术能够解决采用传统海洋水动力学监测利用锚泊式大型浮标,固定在一个位置上采集数据的方法成本高、数据精细化程度不够的问题.由大量的海洋试验和研究证明,该方法在泥沙沉积、漂浮垃圾追踪、...     

我国近海波浪浮标的历史、现状与发展

回顾了我国波浪测量技术特别是近海波浪浮标技术的发展历程,提出了今后发展的若干建议。     

国际ARGO计划对我们的启示

本文概述了国际ARGO计划的科学目标和可能得到的成果，分析了参加ARGO计划对我国海洋技术发展的牵动作用，阐述了ARGO计划对我们的启示。分析了海洋技术对海洋科学发展的推动作用，强调了没有一流的海洋技术手段就不可能有一流的海洋科学成就，而技术的发展需要积累，需要强大的综合国力和良好的工业基础，海洋科学和海洋技术应协调发展。     

海洋潜标系统的静力分析和姿态计算

本文介绍了400m和4000m海洋潜标系统的静力分析和姿态计算方法，以供有关人员交流。     

FZF2—3型海洋资料浮标系统数据采集处理,控制及传输系统

本文主要介绍ＦＺＦ２－３型海洋资料浮标的核心部分－数据采集处理、控制及传输系统的结构及组成,以及各部分的特点关键技术。     

A note on the hydrodynamics of a tail tube buoy

This note presents some analytical results for a tail–tube buoy configuration frequently used in wave energy conversion. The overall approach is based on Falnes and McIver's (Falnes, J., McIver, P., 1985. Surface wave interactions with systems of oscillating bodies and pressure distributions. Applied Ocean Research 7 (4), 225–234) extension to floating oscillating water columns of Evans' (Evans, D.V., 1982. Wave power absorbtion by systems of oscillating surface pressure distributions. Journal of Fluid Mechanics 114, 481–499) theory of oscillating pressure distributions. The diffraction air-flow flux through the tube and the diffraction wave force on the flotation collar are obtained using the formulation of Garrett (1970, 1971) (Garrett, C.J.R., 1970. Bottomless harbours. Journal of Fluid Mechanics 43 (3), 433–449. Garrett, C.J.R., 1971. Wave forces on a circular dock. Journal of Fluid Mechanics 46 (1), 129–139). Results can be used in sizing the tube and collar for efficient energy conversion.