Characteristics of shallow gas hydrate in Okhotsk Sea   总被引：1，自引：0，他引：1  

LUAN XiWu  JIN YoungKeun  Anatoly OBZHIROV  YUE BaoJing Key Lab of Marine Geology  Environment  Institute of Oceanology  Chinese Academy of Sciences  Qingdao  China  Korea Polar Research Institute  KORDI  Incheon  -  Korea  V.I. Il’ichev Pacific Oceanological Institute of the Far Eastern Branch of Russian Academy of Sciences  Vladivostok  Russia 《中国科学D辑(英文版)》2008,51(3):415-421

Multidisciplinary field investigations were carried out in Okhotsk Sea by R/V Akademik M.A. Lavrentyev (LV) of the Russian Academy of Sciences (RAS) in May 2006, supported by funding agencies from Ko- rea, Russia, Japan and China. Geophysical data including echo-sounder, bottom profile, side-scan- sonar, and gravity core sample were obtained aimed to understand the characteristics and formation mechanism of shallow gas hydrates. Based on the geophysical data, we found that the methane flare detected by echo-sounder was the evidence of free gas in the sediment, while the dome structure de- tected by side-scan sonar and bottom profile was the root of gas venting. Gas hydrate retrieved from core on top of the dome structure which was interbedded as thin lamination or lenses with thickness varying from a few millimeters to 3 cm. Gas hydrate content in hydrate-bearing intervals visually amounted to 5%―30% of the sediment volume. This paper argued that gases in the sediment core were not all from gas hydrate decomposition during the gravity core lifting process, free gases must existed in the gas hydrate stability zone, and tectonic structure like dome structure in this paper was free gas central, gas hydrate formed only when gases over-saturated in this gas central, away from these struc- tures, gas hydrate could not form due to low gas concentration.  相似文献   

序言     

中国冶金地质总局"湘西-滇东地区矿产地质调查"二级项目项目管理办公室 《地质与勘探》2019,55(z1)

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前言     

主编副主编简介- 《《地质学报》英文版》2017,91(5)

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A Special Issue Devoted to Geological Research of the tethyan-Himalayan Orogen and the Qinghai-Tibet Plateau     

年特提斯-喜马拉雅与青藏高原研究文集 《《地质学报》英文版》2017,91(2)

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安大略州格林维尔区西港整合深成岩体的构造     

H.  R.  外尼-爱德华 《地质力学学报》1959,(1):275-282

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国家305项目"九五"科技攻关取得重要进展     

年月日至月日  新疆维吾尔自治区人民政府项目办公室分别在桂林南京北京召开会议  对"九五"科技攻关-项目大部分专题进行了验收。"九五"攻关在前两个五年攻关研究的基础上  按照"深化北疆主攻天山开拓南疆"的总体部署  在基础地质矿带评价和开发应用等方面又取得了一系列重要进展。…… 《新疆地质》2000,18(4):356

2000年9月20日至10月31日,新疆维吾尔自治区人民政府305项目办公室分别在桂林、南京、北京召开会议,对"九五"科技攻关96-915项目大部分专题进行了验收。"九五"攻关在前两个五年攻关研究的基础上,按照"深化北疆、主攻天山、开拓南疆"的总体部署,在基础地质、矿带评价和开发应用等方面又取得了一系列重要进展。一、基础研究方面 （1）完成了纵贯新疆南北,穿越三山两盆的2 000 km地学断面地质-地球物理综合研究,测制了全线的人工地震宽角反射／折射剖面,并完成重点地区的深地震反射剖面及宽频带天然地震观测,运用了大地电磁测深、天然…  相似文献   

EXPECTATION-MAXIMIZATION ALGORITHM FOR REGRESSION,DECONVOLUTION AND SMOOTHING OF SHOT-NOISE LIMITED DATA     

S.E.BIALKOWSKI Department of Chemistry  Biochemistry  Utah Stale University  Logan  UT -  U.S.A. 《地理学报(英文版)》1991,(3)

A simple algorithm for deconvolution and regression of shot-noise-limited data is illustrated in this paper.The algorithm is easily adapted to almost any model and converges to the global optimum.Multiple-component spectrum regression,spectrum deconvolution and smoothing examples are used to illustratethe algorithm.The algorithm and a method for determining uncertainties in the parameters based on theFisher information matrix are given and illustrated with three examples.An experimental example ofspectrograph grating order compensation of a diode array solar spectroradiometer is given to illustratethe use of this technique in environmental analysis.The major advantages of the EM algorithm are foundto be its stability,simplicity,conservation of data magnitude and guaranteed convergence.  相似文献   

九十年代荒漠区的水     

约翰·伦纳德·克劳斯雷-汤普森  袁国映 《干旱区地理》1986,(4)

引言从1840年到1925年世界人口从10亿增加到20亿,到1975年人口已达到40亿。预计到2000年世界总人口可能达到60-80亿。干旱区的面积占世界总面积36%,人口占世界总人口的13%,但人类对沙漠区的环境压力却比湿润区大的多。在环境问题上的失误而造成的沙漠化,已经使干旱和半干旱地区的农牧业发展潜力迅速下降。1966-1973年撒哈拉大沙漠出  相似文献   

TIME EVOLUTION OF LOCAL SCOUR AT OBSTACLES PROTRUDING FROM CHANNEL SIDE WALLS     

J. S. dos SANTOS  A. H. CARDOSO Civil Engineer  M. Sc. in Hydraulics  Water Resources  Project Engineer  ExxonMobil Production Company  U.S. East  P.O. Box  New Orleans  Louisiana -  U.S.A. E-mail: ahc@civil.ist.utl.pt Associate 《国际泥沙研究》2001,16(4)

1 mnCnONLocal scour close to bridge piers and abUtInnts has long been a subect of concem for engineers, sinceit can We total or partial collapse of bridges. Until to the Present, local scour has been assessed, moshy,on the basis of resultS of labOratOry stodis. These sthes were cwhed out for steady flows lashng longenough as to gUarantee the develoPment of equlllbrium scour i.e., the develoPmen of scour holes whosedePth and 8haPe no lOnger significanti evolve with hme.In nta, such long l…  相似文献   

塔中涡动资料不同坐标旋转方法比较分析     

李振杰  何清-  金莉莉  买买提艾力.买买提依明  赵佳伟 《沙漠与绿洲气象(新疆气象)》2019,13(3):105-111

坐标旋转是涡动协方差(EC)通量观测数据后处理当中必须进行的步骤,本文利用塔克拉玛干沙漠腹地塔中西面标校站自然沙丘上3 m高度和塔中本站32 m高度2009年4—10月湍流通量数据,对比分析了不同坐标旋转方法在塔中通量观测数据中的应用。结果表明,塔克拉玛干沙漠腹地塔中湍流各通量在旋转订正前后差别不显著,不订正造成的通量计算误差1%。塔中32 m和塔中西站3 m通量计算误差,与两个站点的采集仪器架设高度差别较大有关。即使对于相对平坦的下垫面,也必须要进行倾斜校正,以修正地势、仪器振动、安装倾斜等产生的虚假信息。本研究对塔中涡动资料进行旋转时采用了二次坐标旋转方法。此结果为塔克拉玛干沙漠腹地EC通量观测的风速仪倾斜校正提供参考。  相似文献