Volume estimation of small scale debris flows based on observations of topographic changes using airborne LiDAR DEMs

This paper describes a geographic information system(GIS)-based method for observing changes in topography caused by the initiation, transport, and deposition of debris flows using highresolution light detection and ranging(LiDAR) digital elevation models(DEMs) obtained before and after the debris flow events. The paper also describes a method for estimating the volume of debris flows using the differences between the LiDAR DEMs. The relative and absolute positioning accuracies of the LiDAR DEMs were evaluated using a real-time precise global navigation satellite system(GNSS) positioning method. In addition, longitudinal and cross-sectional profiles of the study area were constructed to determine the topographic changes caused by the debris flows. The volume of the debris flows was estimated based on the difference between the LiDAR DEMs. The accuracies of the relative and absolute positioning of the two LiDAR DEMs were determined to be ±10 cm and ±11 cm RMSE, respectively, which demonstrates the efficiency of the method for determining topographic changes at an scale equivalent to that of field investigations. Based on the topographic changes, the volume of the debris flows in the study area was estimated to be 3747 m3, which is comparable with the volume estimated based on the data from field investigations.     

山东省蒙阴县常马矿区金刚石原生矿深部综合找矿模型

以矿区地质背景、含矿岩体地质特征为基础,分析了蒙阴县常马矿区金刚石原生矿的成矿地质条件,提出含矿岩体是受构造控制的金伯利岩岩体,岩体具有低电阻、低负重力场的地球物理异常等信息。在综合分析矿床成矿地质条件、磁异常、电性异常特征的基础上,初步建立了蒙阴县常马矿区金刚石原生矿矿床地质-磁法-电法综合找矿模型。     

基于波束控制的卫星导航接收机抗干扰算法研究

卫星导航接收机抗干扰技术是接收机设计的一项关键技术。在研究基于功率反演的空域自适应抗干扰算法基础上,提出了采用基于波束控制的抗干扰算法,并进行了仿真计算,结果表明：该算法明显提高了接收机抗干扰性能。     

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?о???????EGM??DTM???????????????????????????????????????EGM2008??SRTM3???????????????????????????????????????????????????T^_zz???????????????????μ??????????????????????????????????????????????????????????????????????????????????????λ???????????????仯??????λ???????ж??????????????????????????????????????????     

综合物探在博格达山前古牧地复杂构造中的应用

准噶尔盆地南缘古牧地地区具有丰富的油气勘探潜力,但由于中深层地震成像存在盲区,长期以来对古牧地构造特征认识不清,制约了油气勘探进程.笔者采用高精度重磁和电法CEMP综合物探技术对古牧地地区构造特征进行了研究,取得了有价值的新认识.研究成果表明,古牧地构造为博格达山前褶皱冲断带的前锋构造,受阶梯状断裂控制.古牧地构造纵向上具多层构造特征,其中浅层为紧闭型逆冲倒转背斜,中层为受阶状逆冲断层控制的屋脊状断块,深层为潜山披覆型冲断背斜.重力异常显示古牧地背斜西围斜可能是一完整的背斜构造,古牧地中深层构造和古牧地背斜西围斜评价为有利的油气勘探目标.     

Galileo系统和区域增强导航系统的定位误差比较

采用最小二乘协方差方法分别对Galileo系统的定位误差和中国区域导航增强系统的定位误差的计算进行定义,并通过matlab编程仿真比较得出:区域增强导航系统的定位误差只有Galileo系统定位误差的三分之一。表明,如果能建立区域增强导航系统将在较大程度上提高中国区域的导航能力。     

电子地图业在卫星导航应用中的发展对策研究

本文分析了卫星导航应用中与地理信息产业相关的电子地图产业在国内外发展的现状与趋势,研究了新时期中国导航电子地图业的基本特征和作用,提出了电子地图产业的发展对策。     

航海英语语义探源

在世界航海过程中 ,人们创造了众多语言词汇 ,丰富了人类语言。英语中也有许多与航海有关的词语 ,它们语义的产生有其特定的背景 ,在使用过程中被赋予新的含义 ,至今广泛使用。     

建设湛江海员人才强市问题探析

分析了建设湛江海员人才强市的战略意义和有利条件,以及建设过程中必须解决的问题,在此基础上分别从营造航海文化氛围、完善海员服务和管理体系、构建校企互动机制、加强航海专业师资建设和实施质量兴校战略等方面提出建设湛江海员强市应采取的对策