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Gobi is one of the most important landscapes in northwest China, and it is also one of the dust sources in north China and even in central Asia. Based on the different land surface characteristics on the gobi surface, sand and dust emission process and mechanism are obviously different with other landscapes, such as sandy desert. Dust emission process and mechanism on the gobi surface were analyzed in this paper. Wind power system, geomorphology pattern and underlying characteristics were considered for their effect on the sand and dust emission process. Then, the mechanism of land surface characteristics on threshold wind velocity was analyzed. Finally, based on the previous studies on dust emission and mechanism, and in combination with the regional and global requirement, we suggested that the land surface characteristics parameterization, identification of the dust sources and sediment emission mechanism should be the main issues in the future gobi sand and dust research. 相似文献
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地统计分析在滑坡遥感监测中的研究进展 总被引:1,自引:0,他引:1
滑坡监测的常规技术方法有多种,如大地精密测量法、近景摄影测量法等,但这些技术往往会受到气候与地形的限制,实施困难较大。而遥感技术可以克服观测条件的限制,并可针对滑坡不同阶段实行监测。此外,地统计分析方法可充分利用遥感数据本身具有的空间相关性,可以提高影像信息提取的准确性。因此,结合遥感与地统计方法进行滑坡监测具有广阔的应用前景。 相似文献
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深厚软基上多(高)层建筑桩基础的共同作用分析 总被引:1,自引:0,他引:1
探讨了深厚软弱地基上多(高)层建筑桩基础的共同作用分析方法,建立了桩土相互作用的界面模型,采用子结构法考虑上部结构刚度对基础变形和地基沉降的影响,同时考虑地基为弹塑性的,并采用无限元法考虑远场区域的影响。通过一个工程实例验证了模型的合理性,计算结果表明,计算方法能反应深厚软弱地基上桩基础的沉降特性。 相似文献
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陆地中低放核废物地质处置的发展与现状 总被引:4,自引:0,他引:4
介绍全球陆地中的中低放核废物处置的发展与现状,重点介绍近地表埋藏处置法,废矿井处置法和深岩硐地质处置法,并简要概述一些国家在陆地核废物处置领域内出现的问题及对策。 相似文献
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David Amat Pinilla 《Environmental Earth Sciences》2012,67(8):2487-2487
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The literature of explosives and blasting consists of a great variety of printed materials. These materials include technical papers, books, and articles by individuals and organizations; manufacturer's product catalogs and brochures; handbooks offering guidance for the field blaster; complete encyclopedias on the subjects (and short entries in general-interest encyclopedias); government publications; proceedings of meetings of organizations devoted to the subjects; magazines specific to the subjects; articles in general circulation magazines; and other miscellaneous sources. In short, there is a multitude of literature, some well indexed for retrieval, but most not. This is a broad-brush look at the literature. 相似文献
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Jörg W. Schneider 《Environmental Earth Sciences》2013,68(4):1211-1211
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James W. LaMoreaux 《Environmental Earth Sciences》2014,72(10):4217-4218
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基于"以人为本"的理念,结合水电勘察设计企业科技型特点,分析水电工程设计专业技术属性,探讨管理内涵及其管理要素,关键是人才与技术的培养机制,提出科学合理的技术管理模式,顺应"以人为本",发挥人的核心作用,促进企业协调发展,具有决定企业成败之深远意义。 相似文献
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A.E. Scheidegger 《Earth》1984,21(4):225-249
This paper reviews the recent developments in the field of mass movements on slopes. The subjects treated include surface-slips, deep-seated soil creep, rock mass creep, surficial landslides, mud flows and Alpine debris flows. In this instance, the paper supplements the Chapter “Accidents on slopes” in the author's book “Physical Aspects of Natural Catastrophes (1975)” by new data published mainly between 1976 and 1983. 相似文献
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DENG Tianlong WANG Shiqiang MENG Lingzong GUO Yafei YU Xiaoping LIU Yuanhui 《《地质学报》英文版》2014,88(Z1):307-309
正1 Introduction Salt lakes are widely distributed in the world,and salt lakes in China are mainly located in the area of the Qinghai-Xizang(Tibet),and the Autonomous Regions of Xinjiang and Inner Mongolia.There are more than 700salt lakes,each with an area larger than 1 km2,in the 相似文献
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基于GIS技术电信基站管理系统的设计与实现 总被引:4,自引:0,他引:4
电信基站管理信息系统是以地理信息系统(Geographic Information System,GIS)为基础开发平台,应用Microsoft Visual Basic 6.0作为开发语言,通过调用ESRI公司ARC/INFO软件中的MapObjects组件,实现了基站内点、线、区空间数据与属性数据的管理,基线的维护、查询和量算,以及规范基站管线设备图的编辑和制图等功能。其中,对GIS图形编辑功能的扩展开发,实现基站管线的编辑和制图功能是系统成功的关键。 相似文献
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钻探进尺、数量、终孔深度、单位进尺的费用等参数是铀矿勘探中的重要实物工作量和可量化指标。以"红皮书"和美国能源信息署等公布的数据为依据,对比分析了中、美两国近两年铀矿钻探统计参数,以及与铀矿勘查之间的关系。 相似文献
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解析群落物种间的个体数量关系,也称群落物种多度分布,被认为是理解群落物种多样性决定机制的关键.近年来已建立了许多物种多度分布模型,但却因模型众多且又难以区分而引发了许多争议.已有研究表明,对物种多度分布模型的筛选不仅要考察其与群落样本实测数据的拟合效果,还要检验其能否在更深层次上揭示某些宏观生态学现象.Su建立的分形模型拟合效果较好,并揭示了物种多度分布的一般性规律,即Nr/N1往往趋近于1∶1/2∶1/3……(Nr和N1分别为降序排序中第r位和第1位物种的个体数量).但该模型尚未得到充分的重视,相关的验证研究也较为欠缺.鉴于此,通过一个全球性群落物种数据库资料,对该模型及物种多度分布的一般性规律进行更为详细的检验.结果显示,分形模型的实际拟合效果很好;物种多度分布的一般性规律可以得到该数据库的支持与验证.上述结果可为比较全面地理解物种多度分布、探究物种多样性的决定机制提供更加可靠的科学依据. 相似文献