3D behaviour of contamination in landfill sites using 2D resistivity/IP imaging: case studies in Portugal   总被引：2，自引：0，他引：2  

E. Martinho  F. Almeida 《Environmental Geology》2006,49(7):1071-1078

Aiming at defining a valid spatial contamination model, resistivity and induced polarization (IP) measurements were used to investigate contamination plumes in the vicinity of two municipal landfills (Ovar and ílhavo). Previous geophysical surveys and underground water samples confirmed the contamination. However 2D resistivity/IP surveys enabled in obtaining a more accurate spatial model. The Ovar survey consisted of two profiles with nine Wenner soundings each; the ílhavo survey was carried out along two individual lines using a Wenner standard pseudo-section. In both situations, negative IP values were found associated with positive IP values, which can be explained mainly by 2D or 3D geometric effects caused by the presence of the conductive plumes. The data were modelled using a 2D inversion program (RES2DINV) and the resulting resistivity and chargeability distributions were displayed as pseudo-sections. The resistivity and chargeability pseudo-sections define the contamination plumes and the sedimentary structure. These case studies illustrate the advantages of 2D resistivity/IP surveys for the mapping of shape and dimension of contamination associated with landfills.  相似文献   

Energy transfer among Pb, Ce and Mn in fluorescent calcite from Kuerle, Xinjiang, China     

Aierken Sidike  X.-M. Wang  Alifu Sawuti  H.-J. Zhu  I. Kusachi  N. Yamashita 《Physics and Chemistry of Minerals》2006,33(8-9):559-566

Natural calcite from Kuerle, Xinjiang, China, shows orange-red fluorescence when exposed to short-wave ultraviolet (UV) light (Hg 253.7 nm). Photoluminescence (PL) emission and excitation spectra of the calcite are observed at room temperature in detail. The PL emission spectrum under 208 nm excitation consists of three bands: two UV bands at 325 and 355 nm and an orange-red band at 620 nm. The three bands are ascribed to Pb²⁺, Ce³⁺ and Mn²⁺, respectively, as activators. The Pb²⁺ excitation band is observed at 243 nm, and the Ce³⁺ excitation band at 295 nm. The Pb²⁺ excitation band is also observed by monitoring the Ce³⁺ fluorescence, and the Pb²⁺ and Ce³⁺ excitation bands, in addition to six Mn²⁺ excitation bands, are also observed by monitoring the Mn²⁺ fluorescence. These indicate that four types of the energy transfer can occur in calcite through the following processes: (1) Pb²⁺ → Ce³⁺, (2) Pb²⁺ → Mn²⁺, (3) Ce³⁺ → Mn²⁺ and (4) Pb²⁺ → Ce³⁺ → Mn²⁺.  相似文献   

利用三维地震在戈壁沙漠区解决复杂地质构造问题     

张灯亮徐忠华  牛小军 《中国煤田地质》2006,18(4):59-61

在分析戈壁沙漠地区地球物理特征的基础上，针对性的提出了解决煤田地质构造问题的方法，包括三维地震野外施工方法的选取、施工因素的选择、资料处理手段；并以获得的实际地质成果证实三维地震在解决复杂地质构造问题的可行性。  相似文献   

3D Modeling and Kinematics of the External Zone of the French Western Alps (Belledonne and Grand Chatelard Massifs, Maurienne Valley, Savoie)     

Didier Marquer  Philippe Calcagno  Jean-Claude Barfety  Thierry Baudin 《Eclogae Geologicae Helvetiae》2006,99(2):211-222

  相似文献   

二维地震观测系统合理性的论证方法     

SUN Xiao-jie LI Chao-lin WANG Li-bin REN Ri-chun LI Hai-yan ZHUANG Yi-ming LIU Ying-xin SUN Ke .Daqing Petroleum Institute  Daqing  Heilongjiang  China .Coalfield Geological  Geophysical Exploration Company of Jilin Province  Changchun  China .Coal Field Geology Bureun of Jilin Province  Changchun  China 《吉林大学学报(地球科学版)》2006,(Z2)

已知勘查区深度范围前提下,最大炮检X和道间距ΔX,不可以太大也不可以太小,施工前能够计算出它的允许值范围。  相似文献   

Influence of Adoptment of Geocentric 3D Coordinate System on Chinese Existent Maps     

CHENJunyong DANGYamin 《地球空间信息科学学报》2005,8(2):79-84

If a geocentric 3D coordinate system is adopted in China to replace 2D non-geocentric coordinate system, the coordinates of the surface points will be changed accordingly. The influences on the current maps of China, especially the topographic maps, are discussed due to the replacement of the coordinate systems. Taking the replacement of Xi‘an 80 coordinate system by GRS80 for a numerical example, this paper analyzes the changes of latitude, longitude, Gauss plane coordinates of the surface points, as well as the orientation and the length changes between the points on the map, including the changes of map border lines and sheet corner points.  相似文献   

二维电子地图和三维虚拟场景的互响应     

苗青 《四川测绘》2005,28(3):103-105

本文提出了基于二维电子地图与三维虚拟场景之间相互响应的思想来克服它们各自的局限性.简要的描述了相互响应的原理、表现形式、实现流程及实现方法.最后提出了一些结论和展望.  相似文献   

基于IMAGIS的数字小区建模探讨   总被引：3，自引：0，他引：3  

余军  李永树 《四川测绘》2005,28(4):160-164

随着城市化水平的不断提高，对城市的规划管理也提出了很高的要求，数字城市作为数字地球的重要组成部分正是在这一背景下提出的。本文结合适普公司的IMAGIS软件，对城市小区鼍维场景建设中的相关问题进行了探讨，并以遂宁市某街区为例进行了实践。  相似文献   

基于3DCM的日照分析模型研究   总被引：3，自引：0，他引：3  

李朝奎  朱庆  陈松林  韩用顺 《武汉大学学报(信息科学版)》2005,30(1):89-92

讨论了几何3DCM（three dimension city model）日照分析的基本模型．基于3DCM日照分析的3个难点问题——阴影显示、日照时间计算、日照间距计算．实现了日照分析的算法功能，并给出了实验与模拟分析结果。  相似文献   

不等电极距情况下高密度电阻率法的反演结果分析     

吴云超  王传雷  陈超 《物探与化探》2005,29(1):19-21

通过高密度电阻率法的模型实验,得出不等电极距情况对直立高阻薄板和低阻球体反演结果的影响:缺失电极对它正下方的ρ_s影响最大,而异常形态主要在水平方向有明显的变化,异常体随电极缺失的位置有趋势变化,电极缺失的数目越多,异常形态变化越大,但是从整体来看反演剖面图基本相似。  相似文献