海上平台桶形基础模型压力压贯与负压沉贯试验研究   总被引：1，自引：0，他引：1  

朱儒弟  何生厚 《海岸工程》1999,18(1):60-66

介绍了海上平台桶形基础模型（模型桶）压力压贯和负压沉贯的试验概况,对比分析了两者贯入力的巨大差异和产生的原因,给出了模型桶压力压贯中贯入深度与压力的关系,负压没贯负压与贯入深度,抽吸泵流量,基土渗流量,桶内土塞隆起之间的关系,试验结果表明,负压沉贯可以大大降低以砂质粉土为基土的土抗力,为在胜利油田类似基土海域海上平台应用桶形基础提供了试验依据,为海上现场导管架桶形基础平台的安装就位施工和控制提供了  相似文献   

Motion Responses Analysis for Tidal Current Energy Platform: Quad-Spar and Catamaran Types     

Junianto  Sony  Mukhtasor  Prastianto  Rudi Walujo  Wardhana  Wisnu 《中国海洋工程》2020,34(5):677-687

China Ocean Engineering - One approach to support floating tidal current turbines is by using a moored catamaran, a barge type platform. Considering its low draft, one might expect that it performs...  相似文献   

澜沧江典型对比流域水力侵蚀快速调查与评价     

陈奇伯  RUDI Hessel  田波  李开书 《云南地理环境研究》2007,19(3):1-6

根据水力侵蚀面蚀和沟蚀两种不同侵蚀形态发生过程尺度空间大小不一的侵蚀特点,确定了研究区面蚀和沟蚀的不同调查评价方法.面蚀的发生过程空间尺度小,选用小区调查方法进行,而沟蚀的发生过程尺度空间大,在典型调查小流域尺度进行全面调查.然后在两种尺度下,分析形成沟蚀和面蚀的影响因素,进行沟蚀程度和面蚀强度分级,并把研究成果展延到澜沧江凤庆河流域和晓街河流域.最后,以在典型调查小流域的研究结果为对照判别依据,判断风庆河和晓街河流域的土壤侵蚀状况.结果显示,澜沧江典型流域的面蚀强度差异不大,沟蚀是造成不同流域土壤侵蚀和沟道输沙差异的主要水力侵蚀形式.  相似文献   

一种四维绘图软件Vis5d使用要点简述     

屠妮妮  陈静  夏茹娣 《高原山地气象研究》2007,27(1)

Vis5D是美国威士康星-麦迪逊大学空间科学与工程中心(SSEC)研制的可视化系统,主要有Bill Hibbard 和Johan Kellum 完成.Vis5D能够直观而清晰地显示3维立体图形,适用于中尺度研究结果,尤其是云物理结构研究.本文介绍了Vis5D的安装过程以及数据文件转换为v5d格式的方法,并以GRAPES数值模式输出产品为例进行了初步的可视化试验.  相似文献   

Microbial ecology of the stratified water column of the Black Sea as revealed by a comprehensive biomarker study   总被引：2，自引：0，他引：2  

Stuart G. Wakeham  Rudi Amann  Katherine H. Freeman  Ellen C. Hopmans  Bo Barker Jrgensen  Isabell F. Putnam  Stefan Schouten  Jaap S. Sinninghe Damst  Helen M. Talbot  Dagmar Woebken 《Organic Geochemistry》2007,38(12):2070-2097

The stratified water column of the Black Sea is partitioned into oxic, suboxic, and euxinic zones, each characterized by different biogeochemical processes and by distinct microbial communities. In 2003, we collected particulate matter by large volume in situ filtration at the highest resolution to date for lipid biomarker analysis and bacterioplankton for enumeration of major prokaryotic groups. Abundances of several prokaryotic groups were estimated using CARD-FISH probes specific for Bacteria, Archaea (Crenarchaeota and Euryarchaeota), epsilonproteobacteria (mainly sulfide oxidizers) and sulfate reducing bacteria. We also measured a wide range of bacterial and archaeal lipid biomarkers. Depth distributions of diagnostic biomarkers are matched with zonation of microbial processes, including aerobic bacterial oxidation of methane, oxidation of ammonium by bacteria and archaea, metal reduction, and sulfide oxidation at the chemocline, and bacterial sulfate reduction and anaerobic oxidation of methane by archaea in the anoxic zone. Cell densities for archaea and sulfate reducing bacteria are estimated based on water column biomarker concentrations and compared with CARD-FISH results.  相似文献   

Basement morphology and rift geometry near the former junction of India,Australia, and Antarctica     

Rudi G. Markl 《Earth and Planetary Science Letters》1978,39(2):211-225

Magnetic and gravity anomaly data, together with features of the basement topography presented here show that the continental margin of western Australia, including the Naturaliste plateau, was shaped by NE-SW-trending rift segments offset by nearly orthogonal transform faults. A steep landward gradient of the isostatic gravity field and a lineated magnetic anomaly which occur together at the continental slope are interpreted as marking the ocean-continent boundary of the rifted margin off Perth and the sheared margin between Perth and the Wallaby plateaus. Anomalies diagnostic of the ocean-continent boundary are not observed at the margins of the Naturaliste plateau; the geometry of the rift zone here is adduced from the disposition of magnetic lineations, fracture zones, and basement features. A geophysical survey of the Naturaliste fracture zone shows it to be a continuous basement trough extending from the Diamantina fracture zone 800 km northwest to Dirck Hartog ridge. Similar basement troughs west of and orthogonal to the fracture zone imply that the region west/southwest of the Naturaliste plateau was, like the region north of it, formerly occupied by Greater India. Marine magnetic anomaly and basement trends suggest that the oceanic crust between the plateau and Diamantina fracture zone could be substantially older than Paleocene, heretofore the oldest crust identified between Australia and Antarctica.  相似文献   

An Observational Analysis of a Derecho in South China          下载免费PDF全文

XIA Rudi  WANG Donghai  SUN Jianhu  WANG Gaili  XIA Guancong 《Acta Meteorologica Sinica》2012,26(6):773-787

Derechos occur frequently in Europe and the United States, but reports of derechos in China are scarce. In this paper, radar, satellite, and surface observation data are used to analyze a derecho event in South China on 17 April 2011. A derecho-producing mesoscale convective system formed in an environment with medium convective available energy, strong vertical wind shear, and a dry layer in the middle troposphere, and progressed southward in tandem with a front and a surface wind convergence line. The windstorm can be divided into two stages according to differences in the characteristics of the radar echo and the causes of the gale. One stage was a supercell stage, in which the sinking rear inflow of a high-precipitation supercell with a bow-shaped radar echo induced a Fujita F0 class gale. The other stage was a non-supercell stage (the echo was sequentially kidney-shaped, foot-shaped, and an ordinary single cell), in which downbursts induced a gale in Fujita F1 class. This derecho event had many similarities with derechos observed in western countries. For example, the windstorm was perpendicular to the mean flow, the gale was located in the bulging portion of the bow echo, and the derecho moved southward along with the surface front. Some differences were observed as well. The synoptic-scale forcing was weak in the absence of an advancing high-amplitude midlevel trough and an accompanying strong surface cyclone; however, the vertical wind shear was very strong, a characteristic typical of derechos associated with strong synoptic-scale forcing. Extremely high values of convective available potential energy and downdraft convective available potential energy have previously been considered necessary to the formation of weak-forcing archetype and hybrid derechos; however, these values were much less than 2000 J during this derecho event.  相似文献   

单只桶基安全负压沉贯操作方法物模试验初探     

张亭健  刘志安 《海岸工程》1999,18(1):25-32

提出了由物质试验方法初步选择的一种可操作的单只桶基安全负压沉贯操作程序,它可作为试验室内多桶基导管架物模试验以及海上（近）原型尺度桶基试验实施负压沉贯操作方法的试验依据,通过对这些试验及其操作程序的修正和完善,可为实际桶基实施海上沉贯作业出一种可靠,安全的操作程序或方法。  相似文献   

Biotechnology of Metal Removal from Industrial Wastewater: Zinc Case Study          下载免费PDF全文

Inga Zinicovscaia  Gheorghe Duca  Liliana Cepoi  Tatiana Chiriac  Ludmila Rudi  Tatiana Mitina  Marina V. Frontasyeva  Sergey Pavlov  Svetlana F. Gundorina 《洁净——土壤、空气、水》2015,43(1):112-117

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Western Europe: geographical perspectives: Clout, H. et al. London: Longman, 1985. 193 pp. £7.95 paperback     

Rudi Ngeli-Oertle 《Applied geography (Sevenoaks, England)》1985,5(4):361-362

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