Surface current variability in the Keum River Estuary (South Korea) during summer 2002 as observed by high-frequency radar and coastal monitoring buoy

High-frequency (HF) radar observations of surface currents were conducted for 3 months during summer 2002 in the Keum River estuary. A comparison between HF radar-derived currents and directly measured ones form a buoy showed that the regression slope is close to 1 and the correlation coefficient greater than 0.86, with an RMS difference less than 13 cm/s which is less than 17% of the tidal current. This fairly good agreement allows us to use HF radar observation in investigating the surface flow and circulation in this tidal-current-dominant coastal-plume area. To examine the spatial variation in tidal current characteristics, as well as currents associated with non-tidal forcing, the HF radar-derived currents were separated into tidal and sub-tidal frequency currents. The overall pattern of M₂-current ellipse distribution in the study area showed a counterclockwise rotation, with the offshore maximum current direction to the northeast. Eccentricity, the direction of maximum current, and the phase of net motion of the ellipse changed near the estuary mouth and near the gap of the Saemangeum reclamation tide dyke due to the complex coastal geometry and the out-flowing jet during the ebb period.     

Developing a high-resolution climatology for the Central California coastal region

This work presents a procedure for developing a high-resolution, regional climatology estimate, named RClimo, off the coast of central California. This high-resolution climatology may provide an alternative way to initialize numerical nowcast/forecast exercises in coastal regions. The methodology includes two primary steps: (1) averaging available data on a high-resolution grid and (2) objective interpolating the resulting average profiles onto a regular grid. The first step involves the computation of averages over density layers in the vertical and allowing for data gaps in the horizontal if data are unavailable at a high resolution. The OA in the second step uses anisotropic correlation length scales derived from the data themselves and an averaging radius to preserve the scales and variability of the synoptic fields.     

我国旬降水量的时空分布特征

用EOF方法分解我国近44a的旬降水场，得知：我国旬降水的6种主要空间型出现的集中时段各不相同，各型均以年际和年内的短周期变化为主，且有各自的长期变化趋势。EOF展开空间型的时间系数间存在显著的统计相关。     

海岸海洋潮流模拟可视化与虚拟现实建模

潮流数值模拟的科学可视化与虚拟现实是海岸海洋科学研究重要的现代技术手段之一。首先从地理信息系统的角度对潮流数值模拟系统的数据模型进行了论述，提出了适合水文数值模拟的对象模型方法；其次探讨了空间流场的可视化技术，阐述了虚拟现实在潮流数值模拟中的作用；最后设计并实现了一个海岸海洋潮流模拟虚拟现实的原型软件系统VRO－cean,并在南黄海辐射沙洲等的潮流数值模拟试验中进行了实际对比检验。     

海量数据CDT快速建立及其实时更新

对海量地形数据快速整体CDT生成、实时更新等算法进行了研究，并在AutoCAd环境下研制了公路数字地面模型软件BID－Land,实现了与公路CAD的集成。190多公里国家重点公路工程勘察设计中的实际应用表明，程序算法具有很强的实用性、极高的效率和良好的地形模拟精度。     

沉管沉放的实时监测

介绍了在沉管隧道施工中,实时监测沉管沉放的一种测量方法.它利用全站仪观测数据,通过坐标系之间的坐标转换,实时计算沉管管体特征点的坐标,从而对沉管的沉放过程进行实时监测.     

IP网络技术的现状及其多媒体应用研究

介绍了IP网络的现状、实现方式以及发展趋势，并分析了基于IP网络的多媒体通信若干技术和应用。     

地球质心运动的频谱分析方法

针对地球质心运动主要是由多种周期运动叠加的特点，依次讨论了谱分析方法中的AR模型谱分析和小波谱分析方法，分别指出：将参数谱分析方法中的AR模型谱分析和非参数谱分析中的小波谱分析相结合产生的小波－AR谱分析以及小波包－AR谱分析方法，在地球质心运动的谱分析中有较好的频率分辨率以及噪声抑制能力。     

VLBI、SLR、GPS综合数据处理方案研究

按参与平差观测值类型的选取不同，对VLBI、SLR、GPS综合处理方案进行了分类。给出了各类方案的平差模型，结合当前我国三种技术的实测情况，分析了各种方案的优缺点，提出了较为可行的综合处理方案。     

1997/1998年El Nino/La Nina期间洋流的演变特征和影响的分析

利用ＴＯＧＡ—ＴＡＯ赤道次表层海流与海温观测资料，比较清楚地揭示了１９９７／１９９８年Ｅｌ Ｎｉｎｏ期间在赤道西太平洋暖池上空西风异常的驱动下，次表层异常海流的产生机制和向东传播过程中的变化特征。对比分析了海表、次表层异常海流的两种热力平流过程，即水平温度平流和因海流水平辐合辐散造成的垂直上翻（或下沉）运动对混合层及海表温度异常的贡献，结果证实了后一效应对ＥＮＳＯ发生发展的重要意义。最后还对文中的海流异常是否就是理论分析得到的Ｋｅｌｖｉｎ波在海流场上的反映进行了讨论。