在基于数字填图系统的1：25万区域地质调查修测中前人地质资料的利用与数据采集     

覃小锋  ;周开华  ;胡贵昂  ;周府生  ;李广宁  ;谢凌锋  ;潘艺文 《中国区域地质》2008,(7):986-994

1：25万区域地质调查修测的核心任务是挖掘、利用前人资料和对前人资料的二次开发。在1：25万玉林市幅数字地质填图试点的过程中．总结出一套基于数字填图系统的前人地质资料利用与数据采集的工作方法。其工作流程和工作步骤可分为6个阶段：①前期准备阶段;②室内地质资料录八阶段;③野外数字地质调查阶段;④室内资料整理阶段;⑤图件编制阶段;⑥成果提交阶段。该工作方法与传统的地质调查方法相比,提高了地质调查的工作效率和质量,已基本上达到了在1：252万区调修测区推广应用的“实战性”要求。  相似文献   

泌阳凹陷毕店地区核三段湖底扇与重力流沉积   总被引：3，自引：0，他引：3  

彭勇民  黄捍东  罗群  彭玉林 《岩石矿物学杂志》2008,27(1):32-38

毕店地区处于泌阳凹陷中部,属于深水沉积区,含砂率多数在20%.该区核桃园组三段Ⅲ～Ⅵ砂组可识别出湖泊相和湖底扇相,具有较为典型的重力流沉积特征.在取心井段中可寻找到液化流、滑塌、拉裂与掉落岩块的滑动证据;此外,发育砂纹层理、泄水沟构造及渫状构造,后二者见于鲍玛序列C段,它们和砂纹层理伴生,这些岩块的上下层均为鲍玛BE段组合的浊积岩所构成的平整岩层.层拉平的地震剖面也表明核三段Ⅳ砂组中的平行、亚平行地震相之间夹有透镜状或波状、眼球状反射结构,平行、亚平行反射解释为深水背景泥沉积,而波状与眼球状反射为典型的湖底扇.  相似文献   

一种计算台风风场的方法     

陈孔沫 《热带海洋学报》1994,(2)

揭示Ｒａｎｋｉｎｅ涡风场模式和Ｊｅｌｅｓｎｉａｎｓｋｉ风场模式之间的联系，并设计了一种台风风场分布模式，它的风速分布曲线落在Ｊｅｌｅｓｎｉａｎｓｋｉ和Ｒａｎｋｉｎｅ涡两个风场模式的风速分布曲线之间，具有一个既优于Ｊｅｌｅｓｎｉａｎｓｋｉ又优于Ｒａｎｋｉｎｅ涡的风速衰减速率，因此它同时克服了Ｒａｎｋｉｎｅ涡模式计算风速偏小和Ｊｅｌｅｓｎｉａｎｓｋｉ模式计算风速偏大的缺点，以一种比较合理的变化趋势向远方衰减，成为一个比较切合实际的台风风场分布模式。同时，文中提出的移行台风风场计算方法对宫崎正卫、上野武夫和Ｊｅｌｅｓｎｉａｎｓｋｉ模式都有一定的改进。  相似文献   

青岛区域构造特征及其与地震的关系   总被引：4，自引：0，他引：4  

李桂群 《海洋湖沼通报》1994,(3):26-32

本文从青岛地区的区域地质背景及历史地震记录，论述青岛地区区域构造特征与地震的关系。进而阐述我国东部沿海地区不大可能发生地震海啸的原因。并对青岛地区今后地震监测及抗震防灾工作提出建议。  相似文献   

在各类天气系统影响下石臼港沿岸波浪场的分布     

黄爱军  李观金 《海洋预报》1994,11(3):15-25

本文查阅了从１９７３－１９８５，１３年的历史资料，对石臼港沿岸波浪场进行了详细的分类、统计分析和计算，提出了各类较强天气系统影响石（即指石臼港）的极端区域，同时获得了石港沿岸各类天气系统影响下的波浪分布特点以及波高计算式，为保障石港的生产及港口建设为石港的波了提供了有益的分析数据和预报手段。  相似文献   

西部大开发与中国经济发展     

赵建军 《海岸工程》2002,21(2):45-52

在对中国西部的区域划分进行界定并阐述中国西部区域特征的基础上,对中国西部的开发进行了历史回顾,并对中国西部开发的历史背景和现实基础、中国西部开发的优势和制约条件进行分析,最后提出了中国西部开发的发展战略和政策措施.  相似文献   

Marine Ecology - A Century of Changes     

Rupert  Riedl 《Marine Ecology》1980,1(1):3-46

Abstract. The major changes within the concepts of marine ecology are investigated, with the aim to design this new journal's scientific format. Four phases of marine sciences are distinguished: the phase of seafarers, of oceanographic expeditions, of marine stations, and of field research. The changes in the latter two are discussed in detail. The changes are described as occurring along three axes. First, as a movement towards the object; accomplished by fieldwork, scientific diving, remote controlled equipment, and by underwater experimentation. Second, the cooperation between several disciplines that led towards bridging gaps. And lastly, how the discovery of unifying principles in ecology (the development of an ecological theory) led the approach in marine ecology towards increasing complexity.  相似文献   

Numerical Solution of Lock-Release Gravity Current with Viscous Self-Similar Regime     

张立柱李行伟  陈国谦 《中国海洋工程》2004,18(1):157-162

Lock-release gravity currents with a viscous self-similar regime are simulated by use of the renormalization group(RNG) k - ε model for Reynolds-stress closure. Besides the turbulent regime with initially a slumping phase of a conslant current front speed and later an inviseid self-similar phase of front speed decreasing as t^-1/3(where t is the time measured from release), the viseous self-similar regime is satisfactorily reproduced with front speed decreasing as t^-4/5,consistent with well known experimental observations.  相似文献   

Geophysical Evidence of a Relict Oceanic Crust in the Southwestern Scotia Sea     

Lodolo  Emanuele  Coren  Franco  Schreider  Anatoly A.  Ceccone  Giulio 《Marine Geophysical Researches》1997,19(5):439-450

The southwestern part of the Scotia Sea, at the corner of the Shackleton Fracture Zone with the South Scotia Ridge has been investigated, combining marine magnetic profiles, multichannel seismic reflection data, and satellite-derived gravity anomaly data. From the integrated analysis of data, we identified the presence of the oldest part of the crust in this sector, which tentative age is older than anomaly C10 (28.7 Ma). The area is surrounded by structural features clearly imaged by seismic data, which correspond to gravity lows in the satellite-derived map, and presents a rhomboid-shaped geometry. Along its southern boundary, structural features related to convergence and possible incipient subduction beneath the continental South Scotia Ridge have been evidenced from the seismic profile. We interpret this area, now located at the edge of the south-western Scotia Sea, as a relict of ocean-like crust formed during an earlier, possibly diffuse and disorganized episode of spreading at the first onset of the Drake Passage opening. The successive episode of organized seafloor spreading responsible for the opening of the Drake Passage that definitively separated southern South America from the Antarctic Peninsula, instigated ridge-push forces that can account for the subduction-related structures found along the western part of the South Scotia Ridge. This seafloor accretion phase occurred from 27 to about 10 Ma, when spreading stopped in the western Scotia Sea Ridge, as resulted from the identification of the marine magnetic anomalies.  相似文献   

开展我国海洋区域地质调查势在必行     

莫杰  刘守全 《海洋地质与第四纪地质》1993,13(2):99-108

本文概述了建国以来我国海洋地质调查与研究工作取得的丰硕成果。论述区域地质调查在海洋地质基础工作和未来海洋开发中的战略意义,介绍了国内外海洋区域地质调查的现状,对开展这项调查的可行性条件,以及进行1/100万海洋区域地质调查的项目内容、技术方法和提交成果等提出了设想和建议。  相似文献