航空物探在珠海-深圳地区浅层水资源环境评价中的应用   总被引：1，自引：0，他引：1  

卢建忠  吴其反  方迎尧  万建华 《物探与化探》2007,31(6):598-604

珠海-深圳地区位于广东省南部,由于多种原因,浅层水资源遭受严重污染,淡水资源不足,致使当地人民生活用水和工农业用水比较紧张,制约着该区的经济发展.为了了解该区水资源状况,近年来应用航空综合物探(航磁、航空电磁和放射性伽马能谱)测量技术,快速有效地查明了该区海侵范围和浅层地下水的水质和淡水区的划分与分布,并对地下热水资源进行了预测,为全面了解该区水资源状况提供了可靠的基础资料,对科学地评价浅层水资源环境具有重要作用.  相似文献   

Revision of the Conchostracan Genus Tenuestheria from the Upper Cretaceous Lanxi Formation in Zhejiang and Its Biostratigraphic Significance in Southeast China   总被引：1，自引：0，他引：1       下载免费PDF全文

LI Gang  WAN Xiaoqiao  Helmut WILLEMS  David J. BATTEN 《《地质学报》英文版》2007,81(6):925-930

The diagnosis of the conchostracan genus Tenuestheria from the Lanxi Formation in Jinhua, Zhejiang Province in Southeast China is revised following an examination of the type species under a scanning electron microscope, which revealed some morphological features on the carapace that had not been recognized previously. The importance of the Tenuestheria Fauna is considered in the context of correlation of six Turonian–Santonian formations in this region of China. The value of the Cenomanian Nemestheria and Turonian Linhaiella faunas in correlating the underlying early Late Cretaceous formations is also noted.  相似文献   

The Cretaceous System in China   总被引：5，自引：0，他引：5       下载免费PDF全文

WAN Xiaoqiao  CHEN Peiji  WEI Mingjian 《《地质学报》英文版》2007,81(6):957-983

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.  相似文献   

海南三亚地区S₄指数与C/N、ROTI的比较分析          下载免费PDF全文

熊波;  万卫星;  宁百齐;  袁洪;  李国主; 《地球物理学报》2007,50(6)

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.  相似文献   

REGULATION OF FLOW AND SEDIMENT LOAD IN THE YELLOW RIVER     

Wenxue LI Jixiang LIU Zhanwei WAN 《国际泥沙研究》2007,22(2):103-113

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.  相似文献   

虚拟实体生成技术研究   总被引：2，自引：0，他引：2  

夏青  万刚 《测绘学院学报》2002,19(4):303-305

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。  相似文献   

地形RSG模型的动态构网算法   总被引：13，自引：1，他引：13  

陈刚  夏青  万刚 《测绘学报》2002,31(1):44-48

论述了一种基于规则格网地形模型的动态构网算法。通过定义模型中顶点间的约束关系以及顶点误差的继承方法，利用四叉树构建出顶点的层次结构，有效解决了不同分辨率网络间接边的裂缝问题，实现在模型误差控制下的多分辨网络的实时正确构网。实验证明，该方法对于实时控制地形模型的细节层次，增强地形模型的绘制效率是非常有效的。  相似文献   

基于特征的城市交通网络非平面数据库的实现   总被引：18，自引：0，他引：18  

陆锋  周成虎  万庆 《测绘学报》2002,31(2):182-186

针对基于特征的GIS及交换网络分析对数据结构的要求，着重讨论了如何建立基于交通网络特征的非平面拓扑，以改进地理分层－关系表设计方法及平面图弧段－节点数据结构在交通网络描述中的不足之处，并通过面向对象的方法、动态分段技术和关系表指针操作，结合实例描述了基于完整交通特征的非平面数据库的实现方法。  相似文献   

我国各地膨润土的矿物学性质   总被引：24，自引：3，他引：24  

侯梅芳  马北雁等 《岩矿测试》2002,21(3):190-194

运用X射线衍射分析技术对我国不同产地膨润土的矿物学性质进行考察；利用K值法测蒙脱石含量。实验表明，各地膨润土具有蒙脱石的含量较高且均为二八面体的矿物学特点；可能由于所处的矿层或局部地球化学环境不同，使得相同矿床的不同颜色膨润土矿物的蒙脱石含量有所差异。  相似文献   

土壤天然热释光测量在可地浸砂岩型铀矿找矿中的应用研究   总被引：12，自引：3，他引：12  

刘庆成  杨亚新  万骏  李怀渊 《铀矿地质》2002,18(2):118-121,128

土壤天然热释光测量是基于土壤矿物晶体能够累积天然辐射场的原理，通过取样测量土壤样品热释光强度进行找矿的方法，在扎吉斯坦铀矿床上进行的应用研究结果表明，该方法是经济而有效的，在可地浸砂岩型铀矿床头部和尾部形成了清晰的土壤热释光高值异常，而在矿体正上方形成低值异常区。  相似文献