2017年1月上旬泰国南部暴雨反复发生机制的研究          下载免费PDF全文

JIN Shuanglong  FU Shenming 《大气和海洋科学快报》2020,(2):155-162

基于0.25°×0.25°的CMORPH日降水量产品以及ECMWF 0.25°×0.25°的ERA5再分析数据,本文对2017年1月上旬泰国南部反复发生暴雨事件的机制进行了研究,这些暴雨事件造成了Ko Samui和Ko Phangan近三十多年来最强的洪水事件。结果表明,初生于中南半岛西南方,向东北方向移动的一个中尺度涡旋是泰国南部重复发生暴雨事件的直接原因。涡度收支分析表明,水平辐合项是这个中尺度涡旋维持的最有利因子,倾斜项是第二有利的因子,而水平和垂直输送则主要造成了涡旋三维空间范围内正涡度向外的净输出,这是不利于涡旋维持的。进一步的分析表明,倾斜项与垂直涡度输送项分别对涡旋的移动及涡旋周边对流层低层的涡度增长较为敏感,这两个作用项在涡旋维持的两个不同阶段内各自表现出了完全不同的作用。  相似文献   

Petrological Characteristics of the Altered Rock in No. 2 Mining Area of the Gongchangling Iron Deposit     

ZHANG Jianmin  FU Jianfei  JIA Sanshi  WU Zhongjian 《地质学报》2014,88(Z2):138-140

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Redefinition and Formation Age of the Tanjianshan Group in Xitieshan Region,Qinghai     

LIANG Xinquan  FU Jiangang  WANG Ce  JIANG Ying  ZHOU Yun  YANG Yongqiang  WANG Zeli  PAN Chuanchu 《《地质学报》英文版》2014,88(2):394-409

The Tanjianshan Group, which was previously divided into a, b, c and d formations, has been controversial for a long time. It mainly distributes in the northern margin of Qaidam Basin and is an important early Paleozoic greenschist facies metamorphic volcanic sedimentary rock formation. Detailed field investigation and zircon LA-ICPMS U-Pb dating of the key strata suggest that the original lower part of a Formation(a-1) versus the original middle upper of d Formation(d-3 and d-4), the original upper part of a Formation(a-2) and b Formation versus the original lower part of d Formation(d-1 and d-2) of Tanjianshan Group are contemporaneous heterotopic facies volcanicclasolite deposit, respectively. The former formations formed during the middle-late Ordovician(463–458 Ma), while the latter ones formed in the late Ordovician(about 445 Ma). The original c formation of Tanjianshan Group, which formed after 430 Ma, is similar to the Maoniushan Formation of Kunlun Mountains and north Qaidam Basin. According to the rules of stratigraphic division and naming, new stratum formations of Tanjianshan Group are re-built and divided into Duancenggou(O1-2td), Zhongjiangou(O2-3tz) and Xitieshan(O3tx) formations. The original c Formation is separated from Tanjianshan Group and is renamed as the Wuminggou Formation(S3-D1w), which shows a discordant contact with underlying Tanjianshan Group and overlying Amunike Formation(D3a). The zircon U-Pb age frequency spectrogram of Tanjianshan Group indicates three prominent peaks of 430 Ma, 460 Ma and 908 Ma, which is consistent with the metamorphic and magmatic crystallization ages obtained from para- and orthogneisses in north Qaidam HP-UHP metamorphic belt, implying that strong Caledonian and Jinningian tectonic and magmatic events have ever happened in North Qaidam.  相似文献   

Tension and Drag Forces of Flexible Risers Undergoing Vortex-Induced Vibration     

SONG Lei-jian  FU Shi-xiao  LI Man  GAO Yun  MA Lei-xin 《海洋工程》2017,31(1):1-10

This paper presents the results of an experimental investigation on the variation in the tension and the distribution of drag force coefficients along flexible risers under vortex-induced vibration (VIV) in a uniform flow for Reynolds numbers (Re) up to 2.2×10⁵. The results show that the mean tension is proportional to the square of the incoming current speed, and the tension coefficient of a flexible riser undergoing VIV can be up to 12. The mean drag force is uniformly and symmetrically distributed along the axes of the risers undergoing VIV. The corresponding drag coefficient can vary between 1.6 and 2.4 but is not a constant value of 1.2, as it is for a fixed cylinder in the absence of VIV. These experimental results are used to develop a new empirical prediction model to estimate the drag force coefficient for flexible risers undergoing VIV for Reynolds number on the order of 10⁵, which accounts for the effects of the incoming current speed, the VIV dominant modal number and the frequency.  相似文献   

LA-ICPMS Zircon U–Pb and Molybdenite Re–Os Isotopic Dating of the Tungsten Deposits in the Dengfuxian W–Sn Orefield, Eastern Hunan Province, South China, and Their Geological Implications          下载免费PDF全文

LIANG Xinquan  JIANG Ying  DONG Chaoge  FU Jiangang  WANG Ce  ZHOU Yun 《地质学报》2014,88(Z2):99-100

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Giant Iron Ore Characteristics in the Region of Anshan-Benxi          下载免费PDF全文

FU Haitao 《地质学报》2014,88(Z2):79-80

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Geochemical Characteristics of Zircon and Apatite in the Alkaline Porphyry in Beiya Gold-Polymetallic Deposit, Western Yunnan Province, South China     

FU Yu  SUN Xiaoming  LIN Hai  OUYANG Xianqing  ZHOU Haoyang 《地质学报》2014,88(Z2):1452-1453

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Multi-source Data-driven Identification of Urban Functional Areas: A Case of Shenyang,China     

XUE Bing  XIAO Xiao  LI Jingzhong  ZHAO Bingyu  FU Bo 《中国地理科学(英文版)》2023,(1):21-35

Urban functional area(UFA) is a core scientific issue affecting urban sustainability. The current knowledge gap is mainly reflected in the lack of multi-scale quantitative interpretation methods from the perspective of human-land interaction. In this paper, based on multi-source big data include 250 m × 250 m resolution cell phone data, 1.81 × 105 Points of Interest(POI) data and administrative boundary data, we built a UFA identification method and demonstrated empirically in Shenyang City, Chi...  相似文献   

REE Geochemical Characteristics of Two Granite-Derived Weathering Profiles, Guangxi, South China: Implications for the Formation of the Ion Adsorption Type REE Deposit          下载免费PDF全文

FU Wei  YAN Xiaodong  LI Wei  ZHANG Yaqian  Zeng Xiangwei 《地质学报》2014,88(Z2):433-434

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Garnierite in A Laterite-Ni Deposit from Kolonodale Area, Sulawesi, Indonesia: A Preliminary Study on Mineralogy     

FU Wei  YANG Mengli  HUANG Xiaorong  ZHANG Yaqian 《地质学报》2014,88(Z2):1451-1451

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