羌塘盆地石油地震反射新剖面及基底构造浅析   总被引：8，自引：1，他引：8       下载免费PDF全文

卢占武高 锐薛爱民匡朝阳  李秋生贺日政李鹏武 《中国地质》2006,33(2):286-290

针对羌塘盆地地表地质条件复杂,地震资料信噪比低,取得高质量的地震剖面存在很大困难等问题,中国地质调查局在羌塘布设了总长约52km的试验剖面,初步摸索出一套适用于羌塘地区地震资料采集与处理的方法技术。处理后的地震叠加剖面上反射信息丰富,揭示出盆地基底以上各构造层的空间展布特征,为查明构造圈闭和构造界面,确定地层的组合等方面,提供了高质量数据。文中在对地震反射特征分析的基础上对两条剖面显示的盆地基底的埋深、形态等方面进行了初步研究。  相似文献   

广西资源红辉沸石性能开发与应用试验的研究     

匡永红  张良钜 《矿产与地质》2006,20(2):182-186

阐述了广西资源红辉沸石矿的地质特征及该产地红辉沸石的物理性质、化学成分及其差热-热重分析特征。根据该产地红辉沸石的性能,试图开发其在高强建筑材料中的应用。在粘土中加入不同比例该产地红辉沸石后,经高温烧结所形成的固体材料的各种物理性质,如密度、表观密度、孔隙度、吸水率等有所降低,而力学性质如抗压强度、抗折强度等则增大。经过反复试验对比,获得了红辉沸石的添加量对烧成材料性质的影响规律。  相似文献   

桂西晚古生代深水沉积研究的新进展     

邝国敦 《南方国土资源》2001,14(3):1-6

文章综述了近年来桂西地区基础地质研究的重要进展。阐述了桂西晚古生代深水沉积的分布特征 ,简介了深水相地层序列并对桂西晚古生代的构造沉积背景作了新的解释。对长期以来认为是侵入岩的广泛分布于桂西晚古生代地层中之基性岩浆岩 ,认为应属火山岩 ;文章还对右江海盆晚生古代以来的地质发展史提出了与“右江再生地槽”理论完全不同的观点 ,并对桂西地区特殊的地质观象———“化石脉”的成因作了探讨  相似文献   

贵州高原北部河流阶地发育与喀斯特地貌演化     

蒋玺  陈文奇  宁凡  孙玉慧  敖进  罗维均  况光显 《地理研究》2021,40(1):81-92

贵州高原北部发育平缓丘丛和深切峰丛2种喀斯特地貌组合,保存于喀斯特山间盆地的河流阶地对区域地貌演化具有指示意义。本文根据阶地发育特征和光释光（OSL）测年,分析阶地形成的时代和动力,结合区域地质背景,探讨构造抬升和河流侵蚀对黔北喀斯特地貌演化的驱动作用。结果显示,绥阳盆地T1阶地时代18.8~8.2 ka,T2时代144.4~104.1 ka;旺草盆地T1年龄为5.5 ka,T2年龄为45.1 ka。绥阳盆地阶地以漫滩相沉积物为主,旺草盆地阶地则多切割了白云岩基岩。分析认为,气候条件影响了阶地的沉积过程,但差异性构造抬升应为区域河流阶地差异发育的主要因素。阶地测年显示,旺草盆地的河流平均下切速率明显高于绥阳盆地,表明芙蓉江流域构造抬升和河流下切强度明显高于洋川河。在差异性构造抬升和河流侵蚀综合作用下,北部大娄山区形成了深切的喀斯特峰丛-峡谷地貌,南部乌江中游流域则发育以平坦盆地和宽缓丘丛为主的地貌组合。  相似文献   

耕地安全时空变化及其驱动力研究——以江西省鹰潭市为例   总被引：1，自引：1，他引：0  

匡丽花  叶英聪  郭熙  谢文  赵小敏 《资源与生态学报(英文版)》2021,12(2):280-291

耕地安全是保障我国持续增长的人口能健康生存的关键。掌握耕地安全的时空变化特征及其驱动力对维护耕地安全意义很大。本研究考虑耕地数量、质量和生态安全的平衡与稳定性,构建了耕地安全评价指标体系,采用改进的TOPSIS方法,对江西省鹰潭市1995-2015年耕地安全状况进行评价,并分析其时空变化特征。利用空间回归模型研究耕地安全时空变化的驱动力,可消除空间自相关的影响。研究结果表明:1995-2005年鹰潭市耕地安全呈快速下降趋势,2005-2015年耕地安全呈缓慢上升趋势。非常危险的耕地主要分布在月湖区,而安全状态的耕地主要位于南部山地区域,一般危险的耕地范围随城市发展方向往西部扩张延伸。驱动因素中,社会经济因素和政策因素对耕地安全变化有显著影响。根据耕地安全的时空变化规律和耕地安全的驱动因素,可采取相应措施提高耕地安全水平。  相似文献   

新国家空间框架解读中国空间转型现象的再审视   总被引：1，自引：0，他引：1  

匡贞胜  孙斌栋 《地理科学进展》2021,40(3):511-523

作为全球化背景下城市与区域空间转型的主流理论框架,新国家空间(New State Space, NSS)框架已被国内学者应用于诠释中国国家空间重构过程。论文梳理了NSS框架的提出背景、重要概念、主要观点以及国内外相关研究成果,发现NSS框架虽能为碎片化的全球空间治理研究提供一个统一的分析视角与平台,但却可能因概念泛化且缺乏可证伪性、框架固化而难以捕捉繁复情境、复杂化现象问题等潜在缺陷而引发理论本体模糊。同时,中国存在特殊的国土空间行政结构、政府间关系、所有制安排、地方官员晋升机制以及市场经济发展路径,基于欧美背景的NSS框架难以准确解析中国的本地化场景。此外,国内学界对NSS框架涉及的概念术语尚缺乏必要的辨析,在某种程度上存在对本土现象的机械化解读,可能导致难以深入探究多尺度国家空间转型的实际过程与底层逻辑,不能实现国内外学界的深度学术对话,进而无法掌握改革开放以来中国空间转型研究领域的话语权。未来有必要重新审视NSS框架的内涵外延,理性解读中国空间转型的实践,力争以本土化实践为基础,构建更具普适性的理论框架来兼容不同国家的情境,在国际上发出中国学者的声音。  相似文献   

基于BCC＿CSM模式的破纪录高温事件研究     

张羽充  况雪源 《气象科学》2018,38(4):531-538

利用国家气候中心发展的海气耦合模式BCC_CSM 1.1模拟的北半球逐日最高气温数据探讨了近年来破纪录高温事件频数变化特征,并预估了其在未来不同情景排放下的可能变化。基于单点逐日最高气温模拟资料呈正态分布及破纪录高温事件符合随机理论,对北半球近50 a破纪录高温事件频数进行了模拟与理论的对比分析。结果表明:破纪录高温事件频数模拟理论比呈现显著的上升趋势,且这种上升趋势海洋大于陆地,低纬大于高纬;通过与气温相关分析得知破纪录高温事件频数模拟理论比的上升趋势主要是由北半球气温上升导致。在此基础上,比较了RCP4.5与RCP8.5两种不同排放情景下破纪录高温事件频数模拟理论比的变化特征,结果表明在后期(2060—2098)二者差异显著,前者变化较为平稳,而后者具有显著上升趋势,这种差异是对气温不同变化的响应,且低纬海洋的响应比陆地更为敏感。  相似文献   

Spatiotemporal characteristics,patterns, and caus-es of land-use changes in China since the late 1980s   总被引：10，自引：0，他引：10  

LIU Jiyuan  KUANG Wenhui  ZHANG Zengxiang  XU Xinliang  QIN Yuanwei  NING Jia  ZHOU Wancun  ZHANG Shuwen  LI Rendong  YAN Changzhen  WU Shixin  SHI Xuezheng  JIANG Nan  YU Dongsheng  PAN Xianzhang  CHI Wenfeng 《地理学报》2014,24(2):195-210

Land-use/land-cover changes (LUCCs) have links to both human and nature interactions. China's Land-Use/cover Datasets (CLUDs) were updated regularly at 5-year intervals from the late 1980s to 2010,with standard procedures based on Landsat TM\ETM+ images. A land-use dynamic regionalization method was proposed to analyze major land-use conversions. The spatiotemporal characteristics,differences,and causes of land-use changes at a national scale were then examined. The main findings are summarized as follows. Land-use changes (LUCs) across China indicated a significant variation in spatial and temporal characteristics in the last 20 years (1990-2010). The area of cropland change decreased in the south and increased in the north,but the total area remained almost unchanged. The reclaimed cropland was shifted from the northeast to the northwest. The built-up lands expanded rapidly,were mainly distributed in the east,and gradually spread out to central and western China. Woodland decreased first,and then increased,but desert area was the opposite. Grassland continued decreasing. Different spatial patterns of LUC in China were found between the late 20th century and the early 21st century. The original 13 LUC zones were replaced by 15 units with changes of boundaries in some zones. The main spatial characteristics of these changes included (1) an accelerated expansion of built-up land in the Huang-Huai-Hai region,the southeastern coastal areas,the midstream area of the Yangtze River,and the Sichuan Basin;(2) shifted land reclamation in the north from northeast China and eastern Inner Mongolia to the oasis agricultural areas in northwest China;(3) continuous transformation from rain-fed farmlands in northeast China to paddy fields;and (4) effectiveness of the "Grain for Green" project in the southern agricultural-pastoral ecotones of Inner Mongolia,the Loess Plateau,and southwestern mountainous areas. In the last two decades,although climate change in the north affected the change in cropland,policy regulation and economic driving forces were still the primary causes of LUC across China. During the first decade of the 21st century,the anthropogenic factors that drove variations in land-use patterns have shifted the emphasis from one-way land development to both development and conservation.The "dynamic regionalization method" was used to analyze changes in the spatial patterns of zoning boundaries,the internal characteristics of zones,and the growth and decrease of units. The results revealed "the pattern of the change process," namely the process of LUC and regional differences in characteristics at different stages. The growth and decrease of zones during this dynamic LUC zoning,variations in unit boundaries,and the characteristics of change intensities between the former and latter decades were examined. The patterns of alternative transformation between the "pattern" and "process" of land use and the causes for changes in different types and different regions of land use were explored.  相似文献   

高可靠熔断器温度应力极限评估试验方法     

董宇亮  彭云霄  匡婷  龚建  谢强 《成都信息工程学院学报》2014,29(5)

提出一种熔断器温度应力极限评估试验方法。不同于熔断器现有规范中的常规温度试验和过载熔断试验,试验方法的特征是对熔断器样品施加最小熔断电流,在不同环境温度下测量熔断时间和绝缘电阻,以考察其极限能力和评估可靠性水平。选用两种国产典型型号高可靠熔断器作为试验样品,对设计的温度应力极限评估试验方法进行了试验验证,结果显示方法是合理可行的,可以指导宇航用高可靠熔断器的选择,为熔断器极限评估试验规范提供基础和依据。  相似文献   

曲折海湾中潮汐和环流的数值研究   总被引：1，自引：1，他引：0  

YU Huaming  WANG Zhaohu  KUANG Liang  WANG Lu  BAO Xianwen  WU He  WANG Xin  DENG Xiaodong 《海洋学报(英文版)》2015,34(1):119-128

The Shacheng Bay(SCB) is one of the most complex coastal bays in southeast China and due to the fact of complicated geometry and dynamic coastal processes, it is considered as a challenging area for the numerical simulation of its hydrodynamic characteristics. The most advanced finite volume ocean model, finite-volume coastal ocean model(FVCOM), has adopted to simulate this hydrodynamic system, where tidal currents, tidal residual current and dye diffusion processes were studied and analyzed quantitatively. The validation of this numerical model matches well with various observation data, including elevation and current data. The misfit of a tidal elevation has a relative standard error of 3.66% and 4.67% for M2 and S2 tide components. The current validation shows a good match with an average error of 10 cm/s and 8° in the speed major axis and its direction respectively between the simulation and the measurement. This proves the robustness and reliability of this model. It is also found that the cape effect is significant and important in this system. The dye diffusion simulations show a 53 d flushing period for the whole inner bay waterbody. The results are of its first kind for understanding the hydrodynamic system in the SCB and they can provide helpful and trustful scientific information for others.  相似文献