Rapid Identification and Emergency Investigation of Surface Ruptures and Geohazards Induced by the M_s 7.1 Yushu Earthquake

<正>The rapid identification based on InSAR technology was proved to be effective in our emergency investigation of surface ruptures and geohazards induced by the Yushu earthquake.The earthquake-generating fault of the Yushu earthquake is the Yushu section of the Garze-Yushu faults zone.It strikes NWW-NW,23 km long near the Yushu County seat,dominated by left-lateral strike slip,and appearing as a surface rupture zone.The macroscopic epicenter is positioned at Guo-yang-yan -song-duo of Gyegu Town(33°03'11"N,96°51'26"E),where the co-seismic horizontal offset measured is 1.75 m.Geohazards induced by the Yushu earthquake are mainly rockfalls,landslides,debris flows, and unstable slopes.They are controlled by the earthquake-generating fault and are mostly distributed along it.There are several geohazard chains having been established,such as earthquake,canal damage,soil liquefying,landslide-debris flow,earthquake,soil liquefying,roadbed deformation,etc.In order to prevent seismic hazards,generally,where there is a visible surface rupture induced by the Yushu earthquake,reconstruction should be at least beyond 20 m,on each side,from it.Sufficient attention should also be given to potential geohazards or geohazard chains induced by the earthquake.     

东昆仑造山带西段早古生代花岗岩锆石LA-ICP-MS年龄、岩石地球化学特征及地质意义

笔者等对东昆仑造山带西段克其克孜苏花岗岩开展岩石学、岩石地球化学及LA-ICP-MS锆石U-Pb年代学研究,探讨岩体的形成时代、成因及地质意义.研究表明,克其克孜苏花岗岩中的锆石U-Pb加权平均年龄为442.3±4.4 Ma(MSWD=2.7),为晚奥陶世—早志留世,是区域上新解体出的早古生代花岗岩.花岗岩SiO2含量...     

The sedimentation rates in the Okinawa Trough during the Late Quaternary

On the basis of accelerator mass spectrometer radiocarbon （AMS ^14C） dating, sedimentation rates of 11 cores collected from the northern to southern Okinawa Trough are discussed. The sedimentation rates in the Okinawa Trough roughly range from 11 to 39cm/ka, and the average is 23.0cm/ka. China＇s continental matter is the main sediment source of the middle Okinawa Trough and has important contribution to the northern and southern Okinawa Trough. The sedimentation rates during the marine oxygen isotope （MIS） 2 are uniformly higher than those during MIS 1 in the northern and middle Okinawa Trough while they are on the contrary in the southern Okinawa Trough. Sedimentation rates in the Okinawa Trough can be one of the proxies of sediment source and an indicator of cooling events.     

基于GeoDatabase模型的长江河口时空数据建模研究

传统的数据模型或数据存储方式已经影响了长江河口的研究进展,对时空数据的组织建模研究,将有利于长江河口研究更好地面向动态过程.论文从时空数据模型的角度,分析和总结了长江河口研究数据的特点、内容,使用简单的方法构建了长江河口时空数据模型,并探讨了时空数据模型的实际应用.     

Surface current field and seasonal variability in the Kuroshio and adjacent regions derived from satellite-tracked drifter data

The muhiyear averaged surface current field and seasonal variability in the Kuroshio and adjacent regions are studied. The data used are trajectories and （1/4） ° latitude by （1/4） ° longitude mean currents derived from 323 Argos drifters deployed by Chinese institutions and world ocean circulation experiment from 1979 to 2003. The results show that the Kuroshio surface path adapts well to the western boundary topography and exhibits six great turnings. The branching occurs frequently near anticyclonic turnings rather than near cyclonic ones. In the Luzon Strait, the surface water intrusion into the South China Sea occurs only in fall and winter. The Kuroshio surface path east of Taiwan, China appears nearly as straight lines in summer, fall, and winter, when anticyclonic eddies coexist on its right side; while the path may cyclonically turning in spring when no eddy exists. The Kuroshio intrusion northeast of Taiwan often occurs in fall and winter, but not in summer. The running direction, width and velocity of the middle segment of the Kuroshio surface currents in the East China Sea vary seasonally. The northward intrusion of the Kuroshio surface water southwest of Kyushu occurs in spring and fall, but not in summer. The northmost position of the Kuroshio surface path southwest of Kyushu occurs in fall, but never goes beyond 31 °N. The northward surface current east of the Ryukyu Islands exists only along Okinawa-Amami Islands from spring to fall. In particular, it appears as an arm of an anti- cyclonic eddy in fall.     

LiPF6的水解行为研究

利用直接电位法,采用标准加入的方式测定了不同浓度和温度条件下,LiPF6水溶液中的F-浓度,同时考察了碱处理对LiPF6水解的影响,并采用电导率测定结果进行了验证.实验表明,LiPF6能够在水中稳定存在,且几乎不受碱度和温度的影响.     

网箱养殖大黄鱼越冬期间脂肪酸的相对含量变化

利用气-质法(GC-MS)对越冬期间海水平均温度在20,16,12,10和8 ℃条件下的2龄大黄鱼肌肉和肝脏组织中脂肪酸组成及相对含量进行分析,结果表明:随着海水水温的降低,机体会增加不饱和脂肪酸含量,尤其是EPA[C20:5(n-3)],EPA在肌肉中的含量从20 ℃时5.71%增至8 ℃时8.06%,在肝脏中从20 ℃时6.76%增至8 ℃时8.44%。由此可见,在越冬禁食条件下,大黄鱼机体通过自身的脂肪酸动态转化和代谢,减少饱和脂肪酸含量,而增加不饱和脂肪酸含量,以此增加膜的流动性,抵御寒冷。     

侧扫声纳系统在海底障碍物扫测中的应用

针对海道测量中侧扫声纳位置精度低的问题,利用GPS定位数据、单波束水深数据和侧扫数据,研究侧扫声纳扫海测量中海底障碍物信息精化问题。海上试验数据表明：文中提出的多源水声测量信息联合扫测海底障碍物的方法,可改善单一侧扫系统目标探测的精度,对海底目标物扫测具有较好的适用性。     

广东海岸带可持续发展决策支持系统总体框架

在阐述了广东海岸带可持续发展决策支持系统的概念后,根据系统的应用需求,确立了系统的总体目标和功能结构,并重点研究了地理信息技术、空间元数据、空间数据仓库技术和决策支持模型与方法等关键技术,在广东海岸带复杂动态海量多源数据的获取、更新、管理、分析与决策中的重要意义和作用,力求为广东海岸带可持续发展决策支持系统的详细分析设计和开发实践提供规范化的解决方案。     

基于GIS的无人机地面监控系统的设计与实现

在分析无人机领域飞行数据特征的基础上,设计实现了一套功能较为完善的无人机地面监控系统。该系统主要完成了无人机飞行状态实时显示、航线规划和航线回放等功能模块。系统借助于G IS技术,导入矢量形式的电子地图,利用丰富的地理信息来辅助实现无人机的地面监控,在V isual C 6.0开发环境下利用基于异步方式和事件驱动方式的串口通信实现了系统与地面控制站的通信,利用地图控制文件实现了地图数据的调度,利用显示缓存实现了视图实时刷新。经过实际联调,系统运行良好,实用性较好。