基于规则网格的复杂断层网络处理与建模     

牛露佳  王双威  曾义文  朱晨媛  王占刚 《地质论评》2023,69(5):1980-1990

断层建模是三维地质结构建模中的主要过程之一。断层面建模过程中需要根据断层间的空间接触或者切割关系进行几何曲面的裁剪,目前方法利用三角网求交算法进行曲面裁剪,但是该算法处理复杂断层面切割关系时往往不稳定。笔者等提出了基于规则网格的复杂断层网络处理与自动化建模的方法和流程,详细讨论了基于网格化的断层网络模型形式化理论表达、建模流程中的断层网络空间关系构建以及相交裁剪处理算法等核心步骤。利用测试数据和煤矿三维地震构造解释数据进行了验证,表明该方法可以有效处理多条互相切割、主辅关系复杂的断层网络,具有较好的算法稳定性;与SKUA—GOCAD断层建模方法对比,能够减少交互过程,提高断层建模的自动化程度。  相似文献   

中亚低涡研究若干进展及问题   总被引：1，自引：0，他引：1  

杨莲梅  张云惠 《沙漠与绿洲气象(新疆气象)》2015,9(5):1-8

总结了50多年来中亚低涡研究及其对新疆天气影响的主要成果,从低涡定义、时空分布特征、生命史、活动规律及其对新疆极端天气的影响,以及低涡环流配置、相应水汽输送、三维动热力结构、长维持的物理成因进行了总结。由于新疆地区天气受到的关注和研究相对较少,近些年中亚干旱气候背景下的中亚天气学发展和预报预警技术研究与东部季风区差距日益加大,致使目前“丝绸之路”核心区建设气象防灾减灾的能力严重不足。提出了中亚低涡研究待解决的问题：中亚低涡背景下中尺度结构特征和演变规律、强对流天气物理模型和中尺度分析诊断量,中亚低涡造成强对流天气的关键影响因子和预报预警指标,这些问题的研究对推进中亚天气学、短期短时天气预报技术的发展,增强防灾减灾能力具有重要意义。  相似文献   

产业有序转移与区域产业协调发展——基于广东产业有序转移的经验     

覃成林  熊雪如 《地域研究与开发》2012,31(4):1-4

阐明了产业有序转移、区域产业协调发展的内涵,构建了产业有序转移对区域产业协调发展作用机制的分析框架。根据这个分析框架,从理论和广东产业转移经验两个方面进一步揭示了产业有序转移促进区域产业协调发展的机制。结果表明,产业有序转移是在政府有效干预下所形成的有利于区域产业协调发展的一种产业转移形式。产业有序转移通过诱致或促进区域产业结构优化调整、区际产业合理分工、区际产业关联互动,以及提高区域产业发展总体效率等路径,促进区域产业协调发展。  相似文献   

Contraction of near-Earth satellite orbits using uniformly regular KS canonical elements in an oblate atmosphere with density scale height variation with altitude     

M. Xavier James Raj 《Planetary and Space Science》2009,57(1):34-41

A new non-singular analytical theory for the contraction of near-Earth satellite orbits under the influence of air drag is developed in terms of uniformly regular Kustaanheimo and Stiefel (KS) canonical elements using an oblate atmosphere with variation of density scale height with altitude. The series expansions include up to fourth power in terms of eccentricity and c (a small parameter dependent on the flattening of the atmosphere). Only two of the nine equations are solved analytically to compute the state vector and change in energy at the end of each revolution, due to symmetry in the equations of motion. It is observed that the analytically computed values of the semi-major axis and eccentricity are consistent with the numerically integrated values up to 500 revolutions over a wide range of the drag-perturbed orbital parameters. The theory can be effectively used for re-entry of near-Earth objects.  相似文献   

几种规则形体的引力垂向导数及其应用     

张赤军 《大地测量与地球动力学》1999,19(2):32-37

鉴于引力垂向导数在大地测量、地球物理中广泛应用,在许多情况下,异常体就是或接近于规则形体,为此推导、引入了球体、半球体、柱体、锥体和长方体的引力垂向导数公式。此外,还讨论了如何将它们用于绝对重力测量和精化大地水准面的实际中。  相似文献   

近地表低速带反演     

裴江云  吴永刚  刘英杰 《吉林大学学报(地球科学版)》1994,(3)

利用瑞雷面波在近地表传播特点，用大小阻尼二乘法迭代反演近地在低速带厚度和速度，给出了大庆两个地区实例试算结果，表明该算法是稳定的，适用于近地在参数反演。  相似文献   

Seismic behavior of asymmetric RC wall buildings: principles and new deformation‐based design method     

Alois Sommer  Hugo Bachmann 《地震工程与结构动力学》2005,34(2):101-124

The seismic design of multi‐story buildings asymmetric in plan yet regular in elevation and stiffened with ductile RC structural walls is addressed. A realistic modeling of the non‐linear ductile behavior of the RC walls is considered in combination with the characteristics of the dynamic torsional response of asymmetric buildings. Design criteria such as the determination of the system ductility, taking into account the location and ductility demand of the RC walls, the story‐drift demand at the softer (most displaced) edge of the building under the design earthquake, the allowable ductility (ultimate limit state) and the allowable story‐drift (performance goals) are discussed. The definition of an eccentricity of the earthquake‐equivalent lateral force is proposed and used to determine the effective displacement profile of the building yet not the strength distribution under the design earthquake. Furthermore, an appropriate procedure is proposed to calculate the fundamental frequency and the earthquake‐equivalent lateral force. A new deformation‐based seismic design method taking into account the characteristics of the dynamic torsional response, the ductility of the RC walls, the system ductility and the story‐drift at the softer (most displaced) edge of the building is presented and illustrated with an example of seismic design of a multi‐story asymmetric RC wall building. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

Electron Diffraction Patterns of Plesiotwinning of Fe-lllite     

CHEN Tao  CHEN Daizhang  WANG Hejin 《《地质学报》英文版》2005,79(3):332-335

Abstract  A new selected area electron diffraction (SAED) pattern was found from Fe‐illite. The lattice of the ED pattern can be described as a compound tessellation of (3,6)[79{3,6}], which is based on a large coincidence‐site lattice (CSL) with oriented crystal associations rotated by a non‐crystallographic angle 26°. This phenomenon corresponds to the plesiotwinning of Fe‐illite and has been never reported in the nature so far.  相似文献   

高分辨三维地震勘探观测系统设计研究     

张云花  孟红星 《中国煤田地质》2006,(Z1)

以开滦林南仓矿业分公司-850区域高分辨率三维地震勘探为研究对象,根据其三维观测系统设计原理,考虑地物条件及区域构造特征,将测区沿该区向斜轴线分成南北两区,两区各自独立设计。北部采用规则观测系统,南部选用非规则观测系统,两者重复区域针对满覆盖、叠加次数、工作量等因素的影响,对观测系统进行适当的调整。观测系统除采用了规则观测系统参数外,还采用了“以道补炮、双边加密炮点、中间激发加密炮点”的方法,确保了勘探区内资料齐全,取得了较满意的观测数据。  相似文献   

营口东部区含硼蚀变岩带特征及找矿方向     

王殿忠  敖丽娟  王奇 《国土资源》1998,(4)

营口东部区是我国硼矿重要产区之一。硼矿体主要赋存于晚元古代辽河群里尔峪岩组的下部,受层位控制。含硼蚀变岩带长１４ｋｍ,宽８～６９ｍ,硼矿体产于蚀变岩带中下部的镁橄岩中。背形向斜、向形背斜核部是硼矿富矿体成矿最有利地段,古浅海含硼碳酸岩凹陷盆地中心是硼矿成矿的最佳古地理环境。背形向斜、向形背斜核部的含硼镁橄岩是硼矿体及隐伏硼矿体的主要找矿部位。  相似文献