共查询到10条相似文献，搜索用时 102 毫秒
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Han Shujie Cheng Qiuming Department of Earth Atmospheric Science York University Toronto MJ P Canada 《中国地质大学学报(英文版)》2000,11(2)
INTRODUCTIONHydraulic conductivity is one of the most important pa-rameters of surficial deposits for hydrogeological study.At awatershed scale,the hydraulic conductivity changes verticallywith decreasing downward from the earth surface and horizon-tally from lithological unit to lithological unit. The verticalvariation of conductivity can be described by hydraulic conduc-tivity decay factor that describes the exponential decay of hy-draulic conductivity with the depth of the considered- p… 相似文献
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Mathematical Geosciences - 相似文献
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Patterns of crystallographic preferred orientation are referred to as texture. The specific subject of texture analysis is
the experimental determination and interpretation of the statistical distribution of orientations of crystals within a specimen
of polycrystalline material, which could be metals or rocks. The objective is to relate an observed pattern of preferred orientation
to its generating processes and vice versa. In geosciences, texture of minerals in rocks is used to infer constraints on their
tectono-metamorphic history. Since most physical properties of crystals, such as elastic moduli, the coefficients of thermal
expansion, or chemical resistance to etching depends on crystal symmetry and orientation, the presence of texture imparts
directional properties to the polycrystalline material.
A major issue of mathematical texture analysis is the resolution of the inverse problem to determine a reasonable orientation
density function on SO(3) from measured pole intensities on
, which relates to the inverse of the totally geodesic Radon transform. This communication introduces a wavelet approach into
mathematical texture analysis. Wavelets on the two-dimensional sphere
and on the rotational group SO(3) are discussed, and an algorithms for a wavelet decomposition on both domains following the
ideas of Ta-Hsin Li is given. The relationship of these wavelets on both domains with respect to the totally geodesic Radon
transform is investigated. In particular, it is shown that the Radon transform of these wavelets on SO(3) are again wavelets
on
. A novel algorithm for the inversion of experimental pole intensities to an orientation density function based on this relationship
is developed. 相似文献
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Stochastic Structural Modeling 总被引：3，自引：0，他引：3
Lars Holden Petter Mostad Bjørn Fredrik Nielsen Jon Gjerde Chris Townsend Signe Ottesen 《Mathematical Geology》2003,35(8):899-914
A consistent stochastic model for faults and horizons is described. The faults are represented as a parametric invertible deformation operator. The faults may truncate each other. The horizons are modeled as correlated Gaussian fields and are represented in a grid. Petrophysical variables may be modeled in a reservoir before faulting in order to describe the juxtaposition effect of the faulting. It is possible to condition the realization on petrophysics, horizons, and fault plane observations in wells in addition to seismic data. The transmissibility in the fault plane may also be included in the model. Four different methods to integrate the fault and horizon models in a common model is described. The method is illustrated on an example from a real petroleum field with 18 interpreted faults that are handled stochastically. 相似文献
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ADINA软件是基于有限元技术的大型通用分析仿真平台,尤其针对结构非线性、流固耦合等复杂问题的求解具有强大优势,广泛应用于各个工业领域的工程仿真计算以及科学研究等各个领域。在机械领域的研究表明,有限元分析建模中的特征技术,对实现设计和有限元分析的紧密耦合,提高产品设计的质量、效率及自动化程度具有重要的意义。通过对几种种特征建模类型的分析和阐述,指出了ADINA建模技术的局限性,为其在各领域的应用提供参考。 相似文献
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三维构造建模是三维地质建模的核心内容,主要揭示地质构造的几何形态和拓扑关系.三维地质建模在许多地质领域发挥着越来越重要的作用,对三维构造建模技术提出了更高的要求,使其能解决更加复杂的地质问题,能够更精细地刻画地质构造.从三维构造建模的应用需求入手,回顾了领域现状,系统阐述了三维构造建模的基本要素、地质规则及构造模型表达方法,以促进三维构造建模理论向完善化发展.同时分析了传统三维构造建模流程中的难点,指出了需要解决的关键技术,并对当前常用三维构造建模方法的优缺点进行剖析,对其今后的发展趋势和方向进行了预测. 相似文献