地形图交通网要素的自动绘制

分析了地形数据库中交通网要素数据,提出了一种基于图元组合并设置图元绘制顺序的交通网要素自动绘制方法,为解决交通网要素的自动绘制提供了一种可选途径。     

公路隧道辅助设计软件的新思路研究

研究了现有公路隧道辅助设计软件的思路和技术特点,结合公路隧道设计过程的实际需要,提出了公路隧道辅助设计软件的新思路,即建模和出图采用参数式与交互式相结合,计算、优化与出图集成统一。这些思路已经在作者开发的公路隧道设计软件中实现,证明了技术的可行性。该软件在同济曙光软件平台上开发,具有修改、实时更新的图形建模和出图功能,结合施工过程的有限元及其它数值方法的分析计算功能,并采用遗传算法等多种优化方法对结构进行最优化设计,具有后处理显示、可视化图纸管理、图纸库等功能。该软件能使整个公路隧道设计、计算、出图在统一的环境下完成,能有效提高公路隧道设计的效率。     

Structure and early evolution of the Arabian Sea and East Somali Basin

The Laxmi Ridge is a large-scale basement high buried beneath the sediments of the Indus Fan. The location of the ocean–continent transition (OCT) on this margin has previously been proposed at either the southern edge of the Laxmi Ridge or beyond it towards the India–Pakistan shelf. The former explains the margin-parallel Laxmi Basin as thinned continental crust, the latter as a failed rift of earlier seafloor spreading. To examine the structure of this margin, a reassessment of marine magnetic data has detailed seafloor-spreading magnetic anomalies prior to anomaly 24 in both the Arabian and East Somali basins. The previously identified anomaly 28 is not interpreted as a seafloor-spreading anomaly but as a magnetized basement feature adjacent to, and merging with, the ridge—the Laxmi Spur. New gravity models across the Laxmi Ridge and adjacent margin using ship and satellite data corroborate the existence of underplated crust beneath the Laxmi Ridge and Basin and the location of the OCT at the southern edge of the Ridge. The results are not compatible with the existence of a pre-anomaly 28 phase of seafloor spreading, although large-scale intrusions may be the origin of some of the basement features in the Laxmi Basin. The models also identify the Laxmi Spur as a low-density feature with a natural remanent magnetization (NRM) compatible with serpentinization. The Laxmi Ridge is mapped to the southeast, where it appears to terminate at a point coinciding with the appearance of E–W magnetic lineations and gravity anomalies at 15.5°N. Thereafter it becomes indistinct. This is interpreted as necessary in the reconstruction to the Mascarene Plateau to avoid continental overlap.     

太原市东山矿区岩溶地下水排供结合研究

太原市为华北地区严重缺水城市之一，而与此紧紧相连的太原市东山煤矿，丰富的岩溶地下水造成750下山煤层无法开采。为了解决东山煤矿12873万t煤炭资源带压开采问题及缓解太原市供水紧张的局面。笔者从分析东山岩溶水系统水文地质条件入手，对井田内水文地质条件进行了定量研究，认为将东山煤矿的疏干降压与太原市的供水结合起来其利大于弊。     

中扬子台地及其南缘早奥陶世道保湾期生态地层

通过对中扬子台地及其南缘早奥陶世道保湾期生态地层的研究，划分出了7个生态相域，即：Batostoma-Calathium群落台地生物礁生态相域、Calathium-Archaeoscyphia群落台地生物礁生态相域、Sinorthis群落内陆棚生态相域、Cameroceras群落中一外陆棚生态相域、Endoceras群落深水斜坡生态相域、Tatragraptus群落盆地边缘生态相域、Didymograptus群落深水盆地生态相域。根据生态相域的组合特征，建立了4个生态相区和1个生态相体系。生态地层研究的结果揭示了中扬子台地及其南缘道保湾期的生态特征、古生物地理和古构造及沉积古地理等特征。     

Imaging of convergent zones by seismic acquisition and processing

Abstract The complex crustal geology of convergent zones requires carefully planned seismic experiments for accurate imaging. Situations that require 2-D or 3-D experiments, pre-stack or post-stack processing, and time or depth migration, are discussed. Some of the advanced techniques available for seismic processing are described. Some results of 3-D post-stack depth migration of a 3-D data set on the Barbados margin that were obtained by the University of Texas Institute of Geophysics and reprocessed at the Houston Advanced Research Center illustrate the advantage of three-dimensionality, and the value of advanced processing techniques.     

SFM法在水盐体系相图计算机成图中的应用(Ⅲ):由子体系出发计算多元水盐相图的一种简便方法

对符号函数矩阵（SFM）法用于水盐体系相图计算机成图过程进行改进，减少了成图工作量，成图结果与文献报导实验值和计算结果吻合。     

Analyse sismo-stratigraphique du bassin d'Abda (Maroc occidental), exemple de structures inverses pendant le rifting atlantiqueSeismo-stratigraphic analysis of the Abda Basin (West Morocco): a case of reverse structures during the Atlantic rifting

The review of the seismic reflection and well data from the coastal Abda Basin (western Morocco) shows that its Triassic and Jurassic sequences were deposited in a submeridean sag basin, whose eastern margin is characterised by progressive truncations and pinching out of these sequences against a prominent Palaeozoic high. The uplift of this latter is interpreted as a response to an Upper Triassic–Middle Jurassic local compressional event that controlled Triassic–Jurassic sedimentation within the Abda Basin. The present day ‘West Meseta Flexure’ is a surface expression of this uplift. To cite this article: H. Echarfaoui et al., C. R. Geoscience 334 (2002) 371–377.