椒江河口浮泥的分布和调整   总被引：7，自引：3，他引：4  

李炎  夏小明  董礼先 《海洋学报》1998,20(4):72-82

应用光学和声学泥沙剖面监测系统,进行1991、1994和1995年3个航次的椒江河口最大混浊带纵横剖面和时间剖面观测.在受控于潮流和径流对比条件的周期性调整基础上,椒江河口浮泥层还表现出非主流聚集趋向和洼地聚集趋向,促使最大混浊带保持对边界条件十分敏感的泥沙储库.  相似文献   

Numerical sea ice prediction in China   总被引：5，自引：2，他引：3  

Wu Huiding  Bai Shan  Zhang Zhanhai 《海洋学报(英文版)》1998,17(2):167-185

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苏北盆地高邮凹陷深凹带古近系戴南组一段沉积格局与时空演化*   总被引：1，自引：0，他引：1       下载免费PDF全文

袁静  董道涛  宋璠  梁绘媛  梁兵  李鹤永  马英俊 《古地理学报》2016,18(2):147-160

以苏北盆地高邮凹陷深凹带古近系戴南组一段为研究对象,综合运用钻井、录井、测井、地震解释和测试分析等手段,识别其主要沉积相类型,总结其砂层组级别的沉积格局与时空演化。结果表明:研究区戴一段主要发育三角洲相、扇三角洲相、近岸水下扇相和湖相等沉积相类型,且在滨浅湖区发育滩坝和非深水事件成因砂体。戴一段沉积时期,三角洲主要分布在深凹带北部,主体为前缘亚相;南部断阶带发育一系列小型孤立扇三角洲;肖刘庄和周庄局部地区发育近岸水下扇;联盟庄地区浅湖相带多个砂层组发育滩坝和非深水事件砂体;湖底扇主要分布在一亚段各次凹中心。真②-1和真②-2断层、汉留断层以及吴①断层形成的梳状断槽等的构造活动,从(弱)氧化水环境为主、演化至各次凹中心以还原水环境为主的水体环境演变等因素,影响并控制着深凹带戴一段沉积格局。高邮凹陷深凹带戴一段沉积充填分为3个阶段:三亚段为明显的退积型式,二亚段呈加积充填型式,一亚段为退积—进积—退积充填型式;邵伯、樊川和刘五舍3个次凹水深和沉积充填过程呈现略有差异的规律性变化。  相似文献   

锡林郭勒盟春季沙尘暴时空分布特征及影响因子分析   总被引：1，自引：0，他引：1  

戴宏丽  董春燕  游晓勇  鲁双宁  王平  郝艳霞 《内蒙古气象》2011,(5):24-28

以锡林郭勒地区沙尘暴高发季节15个气象站1961-2008年春季(3-5月)的气象资料为数据源,分析沙尘暴发生的时空分布规律及气象因子对锡盟春季沙尘暴发生的影响,结果表明:春季沙尘暴发生频次与大风、前期降水量等气象因子有关;另外,沙尘暴的发生与蒙古气旋这一特定的天气系统间存在一致的变化趋势。掌握沙尘暴分布规律及其与气象因素的关系,在预报和监测沙尘暴工作中具有重要的实际意义。  相似文献   

Application of Numerical Models in Marine Pollution Research in China   总被引：6，自引：0，他引：6  

SU Jilan  Dong Lixian 《Marine pollution bulletin》1999,39(1-12):73-79

Like many countries in the world, China is also facing serious problems of marine pollution in the coastal zone. The prevailing concern is eutrophication of the coastal water due to river inputs and, in some bays, also due to the over-expansion of aquaculture. As part of the marine pollution research activities in China, applications of mathematical models are also widely used, both to understand the present and to project the future. In this paper, selected Chinese works are reviewed, especially with respect to the effort in reducing the errors introduced in the numerical treatment of the water quality equation.  相似文献   

Reworking Intensity—A Key Factor Leading to the Formation of Superlarge Gold Deposits in Greenstone Belts and Metamorphosed Microclastic Rocks in China     

王秀璋  陆德复等 《中国地球化学学报》1999,18(4):289-297

The greenstone belt and metamorphosed microclastic rock-type superlarge gold deposits in China are hosted in metamorphic rocks and later intrusive bodies.Sedimentation.regional metamorphism and mineralization contributed a lot to the formation of the deposits,so did remelting magmatic process to some deposits,but the deposits were finally formed by reworking processes.The key factor leading to the formation of superlarge gold deposits is the reworking intensity,which for superlarge gold deposits is reflected by the large-scale reworked source rocks and even ore materials of various sources,strongly oxidized ore-forming fluids with a long and repeated active history and stable geothermal heat current.The factor which decides the reworking intensity is the network consisting of structures of different classes.  相似文献   

公王岭蓝田人时期的季风气候特征   总被引：2，自引：0，他引：2       下载免费PDF全文

董军社  魏明建  邓涛 《第四纪研究》1999,19(2):176-183

作者用目前在黄上与全球变化研究中使用较多、效果较好的气候代用指标,重建了公王岭蓝田人生活时期高分辨率的气候演变序列。从气候环境变迁的角度,研究了115MaBP的公王岭蓝田人及其伴生动物群与气候环境演化的关系。明确提出,蓝田人及其伴生动物群的死亡与夏季风剧烈衰减和冬季风猛烈增强的气候严重恶化事件有关。这种气候恶化除受与地球轨道变化密切相关的太阳辐射和全球冰量变化的影响外,还与青藏高原的剧烈隆升有关。  相似文献   

How did the foreland react? Yangtze foreland fold-and-thrust belt deformation related to exhumation of the Dabie Shan ultrahigh-pressure continental crust (eastern China)   总被引：5，自引：0，他引：5  

J.C.. Schmid  L. Ratschbacher  B.R.. Hacker  I. Gaitzsch  S. Dong 《地学学报》1999,11(6):266-272

During the Triassic collision of the Yangtze and Sino-Korean cratons, the leading edge of the Yangtze crust subducted to mantle depths and was subsequently exhumed as a penetratively deformed, coherent slab capped by a normal shear zone. This geometry requires a reverse shear zone at the base of the slab, and we suggest that the Yangtze foreland fold-and-thrust belt constitutes this zone. Lower Triassic rocks of the eastern foreland record NW–SE compression as the oldest compressional stress field; onset of related deformation is indicated by Middle Triassic clastic sedimentation. Subsequent Jurassic stress fields show a clockwise change of compression directions. Based on nearly coeval onset and termination of deformation, and on a common clockwise change in the principal strain/stress directions, we propose that the foreland deformation was controlled by the extrusion of the ultra high-pressure slab. Widespread Cretaceous–Cenozoic reactivation occurred under regional extension to transtension, which characteristically shows a large-scale clockwise change of the principal extension directions during the Lower Cretaceous.  相似文献   

平潭和漳州深成杂岩中斜长石捕虏晶与岩浆混合作用   总被引：17，自引：5，他引：12  

李武显  董传万 《岩石学报》1999,15(2):286-290

在闽东南平潭和漳州火成杂岩中,广泛发育岩浆混合现象,表现为花岗质岩石中存在辉长－闪长质同深成岩墙和淬冷岩石包体。花岗质和闪长质岩石中普遍存在Ａｎ＞７０％的斜长石捕虏晶。这种成分的斜长石是辉长岩特有的,而不是任一种花岗岩的斑晶。在斜长石捕虏晶四周,都有与花岗岩中的斜长石成分相当的斜长石加生膜。斜长石捕虏晶可分为自形的、熔融状、筛孔状和碎片状等四类,它们各自形成于不同的动力环境  相似文献   

象山港潮波响应和变形研究 Ⅱ.象山港潮波数值研究     

董礼先  苏纪兰 《海洋学报》1999,21(2):1-8

通过象山港水域的潮波运动数值模拟,分析了象山港M4分潮的生成和增长机制．结果说明,潮波传播中的非线性底摩擦效应是M4分潮生成和增长的主要控制因子,M4分潮在湾内的共振现象也起着重要的放大作用二平流效应在绝大部分区域中抑制了M4分潮的发展,只有在佛渡水道中一些岛屿周围极小区域内对M4分潮有增强作用．潮滩在湾内对M4分潮的影响极其微弱．  相似文献