排序方式： 共有39条查询结果，搜索用时 15 毫秒
1.
邓礼标 《广东海洋大学学报》2004,24(5):126-130
针对航海技术的现状和发展趋势 ,提出了高等航海教育应向国际化、高素质化、现代化、技能化、规范化发展 ,以培养高素质的国际航运人才。 相似文献
2.
B. Gjevik D. Hareide B. K. Lynge A. Ommundsen J. H. Skailand H. B. Urheim 《Marine Geodesy》2006,29(1):1-17
A system for displaying tidal currents in an electronic chart display and information system (ECDIS) has been developed and implemented in compliance with the standards of the International Hydrographic Organization (IHO). The tidal current fields can be displayed in real time on the electronic navigational chart and several options and functions for updating and zooming have been designed. The current fields are calculated from a data base with the harmonic constants for the four major tidal constituents. The harmonic constants are obtained from a high resolution numerical model with horizontal grid resolution of 100 m. The model is validated by comparing with sea level and current measurements. The depth matrix for the central part of the model domain was calculated from data from multibeam bathymetric surveys. An application example of the implementation is given for Trondheimsleia, a part of the main sailing route along the western coast of Norway. 相似文献
3.
4.
福建省泉州晋江大桥位于晋江顺济桥至户坑口河段,桥梁横跨晋江两岸,拟选桥位方案为合成氨厂桥位和前埔桥位,本文通过对两个拟选桥位进行桥区河床演变、水流条件分析和通航要求论证。对拟选晋江大桥两个桥位方案进行必选,推荐合理的桥位方案,为大桥桥位的选择提供了科学的依据,对同类桥梁选址具有一定的参考价值 相似文献
5.
我国工程水文分析计算的新进展 总被引：2，自引：1，他引：1
通过对我国在工程水文分析计算的回顾,总结了近年来我国在洪水频率分析、洪水不确定性研究、人类活动及气候变化对径流的影响等方面的最新进展,提出了今后水文计算的研究方向。 相似文献
6.
7.
8.
海冰冰情是开发、利用北极航道的关键信息,研究利用2006—2015年北极地区逐日海冰密集度数据,根据2013年"永盛轮"首航北极东北航道时所经航线为例,提取了航线冰情要素,包括航线通航窗口、逐日海冰密集度时空分布以及海冰密集度月标准差等,对航线通航条件进行了研究。根据航线冰情要素获得了十年间航线通航窗口的基本情况,十年间航线所经水域的大体通航情况和主要冰障位置,7—10月份航线所经水域海冰密集度的变化动态。通过对航线冰情要素的分析,得出影响航线的两个关键海域,并分析了"永盛轮"航线与关键水域航线通航窗口的变化趋势。 相似文献
9.
基于不同类型北斗终端的共天线零基线实测数据,从伪距标准单点定位、单频伪距相对定位以及单历元单频载波相位相对定位等方面,比较一款典型低成本导航型北斗终端与一款典型高性能测量型北斗终端的定位性能差异。结果表明,导航型北斗终端相比于测量型终端,其伪距单点定位和伪距相对定位的精度稍差,但载波相位相对定位精度差距十分明显,无法实现cm级的定位。 相似文献
10.
By use of bathymetric chart,recent change of the riverbed in the North Passage of the Yangtze Estuary has been studied in this paper.The main channel of the upper,middle and lower(section)in the North Passage has been successively eroded and its groin field significantly deposited.At the same time,sediment has been deposited on the entrance region.Erosion and deposition had responded rapidly to the construction of the regulation engineering.There was about one year duration of lagging between erosion in the deep channel and the construction of the regulation engineering.The siltation lag of time in the groin field varied with the initial depth,but the average deposited thickness was about 0.5 m per year.Volumetric analysis demonstrates that there is a increasing trend of siltation in the North Passage after 2002,because of the difference in duration and quantity between erosion in the deep channel and deposition in the groin field.The water volume of the North Passage was reduced by ≈9%(280 million m3)between 2002 and 2006.Sediment budget reveals that the main sediment deposited in the North Passage takes its source from the river and the ocean.The decreasing water volume was attributable to shoaling in the groin field.Its triggering factors for increased sedimentation are the navigational improvements(jetties and groins)after 1998,which altered the passage boundary and destroyed the equilibrium state on the average ebb and flood sediment fluxes.The establishment of a stable estuary is attributed to a reduction in depth of the groin field.The forecast on the sediment deposition quantity and continuous infilling time in the groin system is about 325×106m3 and 6～7 years,respectively. 相似文献