深海锚泊浮标的二阶动力分析   总被引：3，自引：0，他引：3  

朱新颖  黄祥鹿 《海洋工程》2000,18(2):74-78

计算了规则波上深海锚泊浮标的运动响应和锚泊线的动力响应。在对浮标的二阶漂移力计算时考虑了锚系的影响,并将浮标平均漂移的计算结果与不考虑锚系影响的结果进行了比较。本文计算所用浮标为单点系泊浮标,锚链由不同重量的分段组成。  相似文献   

极区海洋环境自动监测浮标总体设计技术   总被引：2，自引：0，他引：2  

熊焰 《海洋技术学报》2005,24(1):14-18

文章对极区海洋环境自动监测浮标的背景作了简要说明,详细介绍了该系统的总体性能指标和总体设计技术,亦给出了部分测量数据结果。  相似文献   

波浪能直接驱动机动浮标的推进机构设计   总被引：1，自引：0，他引：1  

常宗瑜  戴源  常东辉  郑中强 《中国海洋大学学报(自然科学版)》2014,44(4):100-103

移动观测平台是海洋环境立体观测系统的重要组成部分。遥控水下机器人(ROV)、自治水下机器人(AUV)等移动平台由于需要支持船只和能源供给的限制,影响了它们长时间和大范围使用。本文利用波浪垂荡运动设计一种新型波浪能驱动的机动浮标,该系统由水上浮体和水下推进机构两部分组成,利用波浪垂荡运动,推动水下推进机构叶片的摆动,引起水下推进机构在水平方向向前的升力,使水下推进机构以及水上浮体实现无外在能源供给的自主运动。本文设计制造了波浪驱动机动浮标的实验样机,并进行了海试。实验表明,在中等海况条件下可以实现机动浮标的无动力前进。该设计为海洋环境调查、海洋生态监测和溢油跟踪等提供了一种有效的移动监测平台。  相似文献   

A study of transport and impact strength of Fukushima nuclear pollutants in the north pacific surface     

FU Hongli  LI Wei  ZHANG Xuefeng  HAN Guijun  WANG Xidong  WU Xinrong  and ZHANG Lianxin 《中国海洋大学学报(英文版)》2014,13(2):183-190

Based on the statistics of surface drifter data of 1979–2011 and the simulation of nuclear pollutant particulate movements simulated using high quality ocean reanalysis surface current dataset, the transport pathways and impact strength of Fukushima nuclear pollutants in the North Pacific have been estimated. The particulates are used to increase the sampling size and enhance the representativeness of statistical results. The trajectories of the drifters and particulates are first examined to identify typical drifting pathways. The results show that there are three types of transport paths for nuclear pollutants at the surface: 1) most pollutant particles move eastward and are carried by the Kuroshio and Kuroshio-extension currents and reach the east side of the North Pacific after about 3.2–3.9 years; 2) some particles travel with the subtropical circulation branch and reach the east coast of China after about 1.6 years according to one drifter trajectory and about 3.6 years according to particulate trajectories; 3) a little of them travel with local, small scale circulations and reach the east coast of China after about 1.3–1.8 years. Based on the particulates, the impact strength of nuclear pollutants at these time scales can be estimated according to the temporal variations of relative concentration combined with the radioactive decay rate. For example, Cesium-137, carried by the strong North Pacific current, mainly accumulates in the eastern North Pacific and its impact strength is 4% of the initial level at the originating Fukushima area after 4 years. Due to local eddies, Cesium-137 in the western North Pacific is 1% of the initial pollutant level after 1.5 years and continuously increases to 3% after 4 years. The vertical movement of radioactive pollutants is not taken into account in the present study, and the estimation accuracy would be improved by considering three-dimensional flows.  相似文献   

NCEP再分析资料和浮标观测资料计算海气热通量的比较   总被引：1，自引：0，他引：1  

黄艳松  宋金宝 《海洋科学》2011,35(12):113-120

对来自于美国国家环境预报中心公布的NCEP1、NCEP2 再分析资料和来自于定点布放在黄海北部的浮标观测资料进行了比较和分析。结果是： NCEP 再分析资料中的海表气象参数（风速、湿度、气温、海表温度）是可信的。在统计意义上, NCEP2 给出的海表气象参数比NCEP1 与浮标观测值更接近,而净辐射通量则是NCEP1 ...  相似文献   

台湾海峡MODIS遥感SST的初步验证     

李雪丁 《台湾海峡》2011,30(3):336-340

海表层温度（SST）是一个决定海气相互作用以及生物栖息条件适宜性的海洋环境关键参数,可以通过卫星遥感手段获取,对检验锋面多发、水文条件复杂的近岸区域卫星遥感SST产品的真实性,具有重要意义．本文采用大型海洋环境多层监测浮标获取的SST数据对台湾海峡MODIS遥感SST产品进行检验．结果表明,MODIS遥感与实测SST数据具有很好的一致性,两者的均方根误差为0．5l℃,平均偏差为一0．02℃,平均绝对偏差为0．42℃,相关系数为0．988;MODIS遥感与实测SST数据之间可能存在季节性差异,均方根误差以夏季最大．  相似文献   

Diurnal Sea surface temperature response to tropical cyclone Dahlia in the Eastern tropical Indian Ocean in 2017 revealed by the Bailong buoy     

《Dynamics of Atmospheres and Oceans》2020

Tropical Cyclone (TC) Dahlia occurred adjacent to over the equatorial southeastern Indian Ocean during the period 26 November – 3 December 2017 and was observed by the Bailong buoy, which provides in situ observations of high-frequency variations in the upper ocean environment. The diurnal sea surface temperature (dSST) variabilities during different stages of the passage of TC Dahlia are studied. The dSST variability is rather weak during the TC passing stage in contrast to the strong ranges before (0.35 °C) and after (0.57 °C) the TC. Before the influence of TC Dahlia, the dSST presented significant regular variability with a peak in the afternoon and minimum value in the morning, which is similar to the even larger range that occurred after TC Dahlia. During the passage of TC Dahlia, dSST decreased dramatically, and a uniform variation was presented due to the absence of strong heat fluxes and stirring and upwelling induced by strong winds. Further analysis through a one-dimensional mixed layer model (Price-Weller-Pinkel, PWP) indicated that the dominant elements responsible for the different dSST variations during distinct stages of TC Dahlia were shortwave radiation and surface wind, which strongly impacted the dSST evolution during TC Dahlia. The asymmetrical wind strength was responsible for the asymmetry of dSST variation.  相似文献   

库姆塔格沙漠水文调查小流量测验及其误差分析     

王学全  卢琦  严平  俄有浩 《干旱区地理》2011,34(1):20-25

小流量测验是库姆塔格沙漠资源环境本底调查的重要内容.根据库姆塔格沙漠及周边河流泉水野外水文调查(2007-2009),对9条河流泉水16处断面进行了流量测验,分析小流量测验方法及其误差.调查研究表明:(1)库姆塔格沙漠及其周边溪流和泉水枯季径流小,多数河流不适宜用流速仪法实测流量;(2)用V形薄壁堰进行流量测验,其随机...  相似文献   

基于漂流浮标观测分析日本福岛以东表层海洋物质的散播轨迹     

卢锡  胡石建  王凡  胡敦欣  刘海龙  刁新源  于仁成 《海洋与湖沼》2022,53(5):1027-1044

认识海洋中的物质如何散播对于理解海洋环境变化和人类活动污染在海洋中的扩散过程具有非常重要的意义。利用历史海表漂流浮标观测数据,对日本福岛以东海域的表层物质散播轨迹进行了拉格朗日示踪分析和观测模拟试验研究。结果发现,福岛以东海域海表浮标的散播路径主要分为东、南两支,其中速度较快的东支为主要通道,沿黑潮延伸体汇入北太平洋流,最短用时大约22个月即可到达北美西海岸;南支则沿黑潮延伸体以南的大范围南向流向西南方向运移,速度较慢且明显受涡旋活动影响,最快大约5个月即可到达吕宋海峡和中国台湾以东海域,进而进入南海和东海等中国近海海域。通过开展观测模拟试验,发现海表浮标散播的概率密度分布呈现以福岛附近海域为核心、向西南和正东方向递减扩展的形态,其中,到达中国近海的浮标主要通过吕宋海峡进入。文章详细讨论了研究结果的局限性、不足之处,以及因基于大量现场观测而具备的重要参考价值。  相似文献   

Absolute Calibration of TOPEX/Poseidon and Jason-1 Using GPS Buoys in Bass Strait, Australia     

Christopher Watson  Richard Coleman  Neil White  John Church  Ramesh Govind 《Marine Geodesy》2003,26(3):285-304

An absolute calibration of the TOPEX/Poseidon (T/P) and Jason-1 altimeters has been undertaken during the dedicated calibration phase of the Jason-1 mission, in Bass Strait, Australia. The present study incorporates several improvements to the earlier calibration methodology used for Bass Strait, namely the use of GPS buoys and the determination of absolute bias in a purely geometrical sense, without the necessity of estimating a marine geoid. This article focuses on technical issues surrounding the GPS buoy methodology for use in altimeter calibration studies. We present absolute bias estimates computed solely from the GPS buoy deployments and derive formal uncertainty estimates for bias calculation from a single overflight at the 40-45 mm level. Estimates of the absolute bias derived from the GPS buoys is -10 ± 19 mm for T/P and +147 ± 21 mm for Jason-1 (MOE orbit) and +131 ± 21 mm for Jason-1 (GPS orbit). Considering the estimated error budget, our bias values are equivalent to other determinations from the dedicated NASA and CNES calibration sites.  相似文献