粤港澳大湾区1975—2018年海岸线时空演变与影响因素分析

提要:海岸带是陆地向海洋延伸的过渡地带,是人口最为密集、人类活动最频繁的区域,全球超过50％的人口和60％的GDP总量集聚在离海岸线不足100 km的区域.海岸线对海平面上升、海岸侵蚀、港湾淤积、湿地生态资源、近海海域环境等具有重要的指示作用.本研究利用遥感影像获取了粤港澳大湾区(以下简称大湾区)1975—2018年间...     

用数字测高仪漂移测量研究电离层声重波扰动

数字测高仪Digisonde中的漂移测量,常用来研究小尺度电离层扰动,如电离层小不均匀体的漂移。文中提出一种新的分析方法,利用漂移测量数据中多普勒频移和到达角参量的最大熵动态功率谱,估算声重波一类大尺度电离层扰动的水平传播速度和传播方向。作为实例,研究了Millstone Hill测高仪站的漂移观测资料,并对处理结果进行了初步分析。分析结果表明,从数字测高仪漂移测量数据中,可有效地提取声重波一类大尺度电离层扰动的传播参量,在电离层动力过程的研究中很有意义。     

PRESENT STATUS OF EXPERIMENTAL STUDY ON HEAVY METAL POLLUTANT ADSORPTION－DESORPTION BY SEDIMENT IN CHINA

ＰＲＥＳＥＮＴＳＴＡＴＵＳＯＦＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＮＨＥＡＶＹＭＥＴＡＬＰＯＬＬＵＴＡＮＴＡＤＳＯＲＰＴＩＯＮ－ＤＥＳＯＲＰＴＩＯＮＢＹＳＥＤＩＭＥＮＴＩＮＣＨＩＮＡＨＵＡＮＧＳｕｉｌｉａｎｇａｎｄＷＡＮＺｈａｏｈｕｉ（Ｐｏｓｔｄｏｃ...     

裂隙岩体渗透性空间分布的指示克里格估值

本文较详细介绍了指示克立格估值的基本方法和原理，以指示变异函数为基本工具分析了向家坝坝址区裂隙岩体渗透性空间分布的结构特征，表明该址区裂隙岩体渗透性存在明显的各向异性特征；在此基础上用指示克立格法对未采样点处进行估值，估值结果显示坝址区裂隙岩体渗透性存在明显的壳状渗透结构特征.通过这一实际应用，表明指示克立格法可以较好地描述裂隙岩体渗透性的空间分布规律.     

基于OpenGL的三维地层可视化控件的设计与实现

文章讨论了一种用ActiveX技术封装OpenGL函数的方法.由于ActiveX的优秀特性,构造的程序可以实现软件重用,这为OpenGL在计算机三维地层可视化方面的应用提供了一种更为先进的思路.文章对利用ActiveX技术,结合OpenGL来开发三维地层可视化控件的原理,数据结构及基本步骤进行了详细地介绍,并给出了程序运行效果.     

内蒙古乌达地区地球物理场特征与地下煤火分布

以2004年内蒙古乌达地区1:5000大比例尺的直升机航空电磁、磁综合测量资料为基础,结合地面煤田地质、物探、遥感等资料,对内蒙古乌达地区的航空磁场特征、航空电磁场特征与地下煤火分布的关系进行了分析与研究,在综合分析的基础上,建立了该区的地下煤火划分标志,并对该区的地下煤火分布和燃烧状况进行了分析和圈定.     

The Cretaceous System in China

This paper provides an outline of Cretaceous stratigraphy and paleogeography in China, which is based on rich data obtained from recent researches. Cretaceous deposits are widespread in China. Most strata are of nonmarine origin and marine sediments occur only in Tibet, western Tarim Basin of Xinjiang, Taiwan and limited localities of eastern Heilongjiang. All deposits are rich in fossils and well-constrained biostratigraphically. The stratigraphic successions of different regions are illustrated, and general stratigraphic division and correlation have been introduced. The marine deposits are described in the Tibetan Tethys, Kashi-Hotan Region of Xinjiang, eastern Heilongjiang, western Yunnan and Taiwan; the nonmarine deposits are outlined from northeast China, southeast China, southern interior China, southwest China, the Shaanxi-Gansu-Ningxia region, and northwestern China intermontane basins. The sedimentary facies and paleogeography are diversified. In Tibet the basin evolution is largely related to the subduction and collision of the Indian Plate against the Eurasian Continent, and shows a tectonic evolution in the Cretaceous. Foraminifera are a dominant biota in the Tibet Tethys. Nonmarine sediments include variegated and red beds, coal- or salt-bearing horizons, and volcanic rocks. These deposits contain diverse and abundant continental faunas and floras, as well as important coal and oil resources. The Cretaceous stratigraphy and paleogeography in China have presented a foundation for geological studies.     

海南三亚地区S4指数与C/N、ROTI的比较分析

本文通过利用海南三亚站（1834°N, 10962°E）GPS闪烁/TEC接收机2004年8月到2005年7月间观测数据，在对三亚地区闪烁初步统计分析的基础上，比较分析了观测数据中S₄（幅度闪烁指数）和C/N（载噪比），S₄和ROTI（TEC变化率标准差）的关系，同时对2004年11月7日的闪烁事件进行了具体的分析. 通过比较分析得出：（1）三亚地区全年的闪烁强度具有明显的半年变化，在春秋季出现全年闪烁强度的最大值；（2）S₄与C/N具有很好的负相关性；（3）ROTI可以作为由小尺度不规则结构引起闪烁出现的指示剂.     

REGULATION OF FLOW AND SEDIMENT LOAD IN THE YELLOW RIVER

Small runoff, large sediment load, and incompatible relationship of flow and sediment load are very important characteristics of the Yellow River. They are also the crux of the most prominent problems of the Yellow River. To solve these problems, the regimes of flow and sediment load have to be improved by increasing water, reducing sediment load, and by using reservoirs to regulate flow and sediment load. The results of experiments for regulating the flow and sediment load in the last three years by the Xiaolangdi Reservoir have indicated that this measure is a realistic and effective way to mitigate the prominent problems in flood control of the Lower Yellow River at present and in the near future. However, the regulation system is still imperfect. It is advisable to speed up the pace of research and construction of the system for regulating flow and sediment load.     

虚拟实体生成技术研究

介绍了虚拟实体的定义、研究内容和一个研究实例，并指出了虚拟实体生成研究对测绘保障的意义。