TDS单台地震处理软件包

ＴＤＳ地震自理软件包是一套适用于单台三分向地震台站的地震数据处理系统。该软件包采用简体中文Ｗｉｎｄｏｗｓ９５／９８ＮＴ工作平台,能够连续记录实时地动信号,检测、分析、处理和定位地震事件。该系统定位采用Ｐ波波列计算方位角,Ｐｇ／Ｐｎ／Ｐ,Ｓｇ／Ｓｎ／Ｓ／Ｌｇ１／Ｌｇ２计算震中距。介绍了该软件包的功能,技术途径以及实际应用。     

Bathymetric patterns of megafaunal assemblages from the arctic deep-sea observatory HAUSGARTEN

Five photographic transects, covering some 830 m² of seafloor in total, were analyzed to characterize the megabenthic community along a bathymetric gradient covering water depths from 1200 to 5500 m in the eastern Fram Strait. Megafaunal densities ranged between 11 and 38 ind. m⁻². The highest densities were found at 1650 m and the lowest densities occurred at 3000 m depth. The number of taxa and morphotypes ranged between 4 at 5500 m and 27 at 1650 m water depth. Ophiocten gracilis, a small white unidentified amphipod, Kolga hyalina, and Bathycrinus carpenteri were the dominant and characteristic species on the slope and continental rise. Elpidia heckeri dominated in the Molloy Hole, the deepest depression known in the Arctic Ocean. Megafaunal zonation patterns appeared to be mainly controlled by food availability, as indicated by phytodetrital matter measured at the seafloor, and by benthic biomass in the sediments, as indicated by sediment-bound particulate proteins and phospholipids. By contrast, physical factors, including water depth and seabed properties such as sediment porosity and hard substrata (e.g., dropstones), appear to play a secondary role in determining megabenthic zonation patterns along the bathymetric HAUSGARTEN gradient.     

海监航空遥感平台及其在近海水体环境质量监测中的应用

中国海监飞机上装备了光电平台、多光谱扫描仪、高光谱成像仪三大遥感器以辅助海洋监测,对这些遥感器及其在水体环境质量监测中的应用进行了简要介绍。目前海监航空平台已在水体悬浮物调查、核电温排水口监测和溢油监测等方面体现出了巨大潜力。未来将继续深入研究航空遥感平台的应用技术,以更好地利用它不同于卫星的高分辨率、高光谱的灵活机动的监测能力为经济建设的安全可靠发展保驾护航。     

Determination of wave–shoreline dynamics on a macrotidal gravel beach using Canonical Correlation Analysis

This paper describes the application of Canonical Correlation Analysis (CCA) to derive forcing–response relations between the wave climate and shoreline position on a macrotidal gravel barrier located in the southwest of the U.K., and to develop a tool to determine shoreline positions from wave records. The data sequences comprise wave climate recorded by a nearshore directional wave buoy and video-derived shorelines over a time span of one year and a half. The hydrodynamic conditions are used to determine the probability density function of wave heights and alongshore energy fluxes. These are then related to shoreline change through a CCA analysis. The CCA analysis identifies patterns of behaviour of the wave conditions and the shoreline position, and the relation between both patterns is found to provide useful information about the beach response to wave action. The analysis shows that the movement of sediment is greater at the southern end of the study area and that there is an immediate shoreline response to the wave action. In the case of coastal management it is more often the case that wave forecasts are available on a routine basis. The ability of the CCA to provide useful estimates of shorelines from wave conditions was tested by using measured waves to calculate the corresponding shoreline position from additional data at the end of the sequences. Shoreline positions determined with the CCA agreed well with the measured ones. Thus, the CCA is found to be a useful tool to determine unknown shoreline positions and support effective coastal management if good quality hydrodynamic and morphological data are available to input into the initial set-up of the technique.     

Coastline sand waves on a low-energy beach at “El Puntal” spit, Spain

Coastline sand waves have been observed at “El Puntal” spit, located on the north coast of Spain. The spit has been monitored by an Argus video system since 2003 and the formation and destruction of sand waves has been observed. Coastline data from the video images are analyzed by means of principal components analysis, obtaining a mean sand wave length of 125–150 m and a maximum amplitude of ≈ 15 m. It is also observed that sand waves reach their maximum amplitude at about 15 days. No propagation of these sand waves is noticed during the approximately two-month-long events analyzed. Sand wave formation and evolution are examined in relation with the prevailing local wave conditions during that period. Incident waves at the west end of the spit approach from the east–northeast, with a very high angle with respect to the shoreline. Field observations suggest that sand waves may result from an instability in alongshore sediment transport caused by moderate-energy waves with a high-angle incidence.     

基于FPGA的实时视频采样控制器设计

为了解决大容量实时视频信号存储器存储延时,以及速率慢、总线利用率低的问题,提出一种基于视频帧信号,切换SDRAM和切换Bank完成视频信号快速、连续存储控制器的设计思路,解决了存储器总线效率低,视频帧信号不能完整顺序保存的问题.为后续视频处理器提供了高质量、高速率的视频码流,向实时视频监控DVR的设计奠定了基础.     

新一代全国天气预报视频会商系统的设计和建设

为解决全国天气预报视频会商系统在自由交互、应用场景和自动化操控等方面的不足,设计建设了新一代全国会商系统。该系统基于云计算和虚拟化技术建成了专有云部署的气象云会商平台,弥补了天气会商在互联网接入方面的短板,拓展了天气会商在公务出差、跨部门联动等场景中的应用。同时,通过将分布式技术应用于会商主控中心,实现基于IP编解码的大容量信号交互和传输,与原有系统相比交互能力提升超过15倍,自动化会议操控技术的引入提升了会议管理和调度能力,也将操作复杂度显著降低。该系统于2019年3月正式启用以来,在国庆70周年等重大活动服务保障以及气象部门抗击新冠疫情工作中均发挥了巨大作用。     

广东地区一次飑线过程的地面雨滴谱特征分析

利用3台二维视频雨滴谱仪(2DVD)、广州S波段双偏振雷达以及C-FMCW雷达资料,分析广东地区2017年5月8日一次飑线过程不同降水部位的雨滴谱特征。根据雨强随时间变化,区分对流降水区,同时以对流降水区为分界线,将此次飑线过程划分为飑线前部、飑线中部和飑线后部。结果表明,飑线不同降水部位雨滴谱特征存在明显的差别。飑线前部,粒子谱分布变化剧烈,中小粒径的粒子居多,粒子数浓度较飑线中部偏低;飑线中部,粒子分布较分散,中等粒子比重较高,粒子数浓度最高,雨强的增加主要与雨滴数浓度有关;飑线后部,降水粒子分布较集中,且以高浓度中小粒子为主。另外,还研究了μ-Λ关系和Z-R关系。μ-Λ之间存在较好的二项式关系;不同降水部位Z-R关系差异较大,分别为Z=8.94R2.70、Z=526.98R1.22和Z=467.56R1.42。飑线不同部位雨滴谱演变特征存在一些明显差别,同时,同一部位不同空间位置也存在着一定的差异。      

气象影视片头动画技术发展的探讨

概述了气象影视片头动画技术的发展历程和阶段性技术上的更新及结合,通过实例分析和概述了各个发展阶段的创作思想和技术特点,同时在精品人才、制作设备、技术整合和原创设计等几个方面对未来的发展趋势进行了探讨。     

广西气象台影视广告竞争性环境分析

采用美国著名战略学者——迈克尔.波特的五种竞争力量模型分析方法,通过对身处媒体巨变中的广西气象台影视广告环境的竞争性进行分析,提出了竞争对策。