泥石流堆积形态与坡降的相关性分析

本文以密云县石城镇贾峪东沟为实验模拟原型,通过小型水槽实验,对沟床纵坡降与泥石流堆积形态的关系进行实验研究。通过实验,获取了不同沟床纵坡降泥石流的堆积长度、宽度、厚度、堆积面积以及堆积形态比方面的数据。通过对实验数据分析,得出沟床纵坡降分别与堆积长度、宽度、厚度、面积与堆积形态比的回归方程及相关系数,为泥石流危险性或危害性评价提供参考。     

基于岸线配准的海岛礁遥感影像几何纠正方法

由于缺少可靠的控制点,很难对遥远海岛进行几何精校正.在假定海岛岸线相对稳定的情况下,提出一种基于海岸线配准的几何校正方法.首先,基于波谱分析从卫星影像提取海岸线;接着,根据海图上陆地特定的颜色提取海岸线;最后,通过将两种岸线进行配准实现了几何精校正.试验表明这个方法可行,校正结果也令人满意.     

The Effect of Tide on the Global Climate Change

The differential rotation between the solid and fluid spheres caused by tidal force could explain the 1500 to 1800 - year cycle of the worlds temperature. Strong tide increases the vertical and horizontal mixing of water in the oceans,dra-wing the cold Pacific water from the depths to the surface and the warm water from the west to the east, where it cools or warms the atmosphere above, absorbs or releases CO2 to decrease or increase greenhouse effect and to make La Nina or El Nino occur in the global. The moons declination and obliquity of the ecliptic affect the tidal intensity. The exchange of tidal energy and tide -generating force caused by the sun, moon and major planets makes the earths layers rotate in different speeds. The differenti-al rotation between solid and fluid of the earth is the basic reason for El Nino and global climate change.     

1985—1990年地磁基准台站时均值数据集

北京、佘山、长春、拉萨、广州、武汉、兰州、乌鲁木齐地磁台在中国最早开始地磁观测,系统收集、清理8个地磁台在1985—1990年的历史资料,采用数码拍照和人工录入方式,实现纸质资料数字化,同时研制数据入库软件,将梳理后的数据导入“十五”数据库,并进行质量审核,实现珍贵历史资源的电子化、数据化、标准化和规范化,为数据的后续使用奠定基础。本数据集展示了8个地磁台站在1985—1990年的地磁观测数据,数据内容由磁偏角（D）、水平强度（H）和垂直强度（Z）3个要素的绝对时均值组成。利用该数据集,可以开展地磁场、空间天气以及关系国计民生的导航、通讯、电网、高铁、油气管道等的研究工作。     

Current-independent paleomagnetic declinations in flysch basins: a case study from the Inner Carpathians

Paleomagnetic declinations from the Inner Carpathian Paleogene Basin imply that the area rotated counterclockwise about 60°, during the Miocene[1]. The question may arise if the paleomagnetic declination could have been biased by the W-E directed turbidity currents prevailing in the basin causing an apparent counter-clockwise rotation of the paleomagnetic direction.

The paleomagnetic results were obtained for fine grained strata, deposited in relatively calm water. Nevertheless, to confirm the paleomagnetic rotation, we needed evidence that flow activity on the magnetic grains was indeed insignificant in the beds yielding paleomagnetic results. Therefore, we carried out magnetic anisotropy measurements.

Results of AMS (representing para and ferromagnetic minerals together) measurements, compared with paleomagnetic observations, demonstrate that well-clustered lineations at locality level and failure to define a paleomagnetic direction are coupled. Lineation, when observable, is flow parallel, suggesting that magnetic lineation in the Inner Carpathian flysch basins may be regarded as a good proxy for turbidity current direction. It is remarkable, however, that the well-defined paleomagnetic directions are observed for localities, where the magnetic fabric is not showing lineation on locality level. Moreover, the lineation direction of the ferromagnetic minerals alone (obtained by measuring the anisotropy of the remanence) is independent of that of the turbidity currents. Thus we can safely conclude that the Inner Carpathian flysch basin indeed was affected by 60° tectonic rotation, and the paleomagnetic vectors were not biased by paleocurrents.     

大坡度并小半径曲线段盾构操作与纠偏施工控制研究

以天津地铁三号线水上北路站—吴家窑站盾构区间左线施工为背景,针对盾构施工区间遇到的大坡度并小半径曲线的综合难题,利用施工过程中积累的各种数据,采用受力分析和数理统计的方法,分析了盾构推进过程中各项参数对掘进的影响,探讨了盾构掘进过程中的操作与纠偏技术,得出了正确分析所采用推力的大小和方向、铰接的使用以及在特殊曲线段设置纠偏曲线是大坡度并小半径曲线段盾构操作与纠偏的重点。     

浅议高精度遥感正射影像的获取

阐述了应用高分辨率卫星WorldView-2获取的地球表面沈阳市域影像数据制作沈阳市正射遥感影像图的工艺,并介绍了VirtuoZo NT（全数字摄影测量系统）及ENVI（遥感地物定量化工具）、EPT（易拼图）在制作正射影像图过程中的应用。     

基于FAST测点的大幅宽HJ星图像几何精纠正方法

针对环境与灾害监测预报小卫星(HJ)图像存在较大整体几何误差,且无规律可循,难以使用全局模型模拟整景图像几何变形,而基于手动方式选取控制点的全局模型和局部模型都不适合于HJ图像几何精纠正的问题,提出一种基于加速分段测试特征(features from accelerated segment test,FAST)算法测点并用局部模型进行几何精纠正的优化方法。首先以FAST算法获取大量地面控制点(ground control point,GCP);再使用多项式模型对GCP的均方根误差阈值、潜在不匹配和实际不匹配GCP数量进行相关分析,据此修正FAST参数,筛查GCP误点;最后使用局部模型完成几何精纠正。此外,使用散点图和空间插值等方法建立适合于HJ图像几何精纠正结果的评价指标。检验结果表明,该方法能使纠正误差控制在1.5个像元内,纠正后的图像能满足中分辨率尺度的应用要求。     

资源三号卫星数据矿山地质环境调查研究

采矿引起的一系列矿山环境问题不仅威胁到人们生命财产安全,而且严重影响和制约着经济的发展,也引发了一系列社会问题和矛盾。本文运用资源三号卫星遥感数据,以黑龙江省鹤岗市为例,解译鹤岗市矿山地质环境,并对遥感图像解译成果进行综合分析研究。     

缺少控制点的WorldView-2卫星影像正射纠正

WorldView-2卫星是全球第一批使用了控制力矩陀螺的商业卫星,可以更精确的瞄准和扫描目标,先进的地理位置技术使扫描的精确度上有了非常大的进步。WorldView-2卫星在无控制的条件下有较高的定位精度,利用少量控制点能消除系统误差达到较高的平面精度,能很好的应用到控制点困难的地区。本文主要是对WorldView-2卫星图像进行区域网平差的正射纠正实验,并对纠正精度进行分析。