Estimating DNAPL Composition and VOC Dilution from Extraction Well Data   总被引：1，自引：0，他引：1  

R. E. Jackson  P. E. Marine 《Ground water》1995,33(3):407-414

  相似文献   

REE and εNd of clay fractions in sediments from the eastern Pacific Ocean:Evidence for clay sources   总被引：1，自引：0，他引：1  

LIU Jihua    SHI Xuefa  CHEN Lirong  HUANG Yongyang  WANG Yinxi  CUI Yingchun & BU Wenrui . Key Laboratory of Marine Sedimentology & Environmental Geology  First Institute of Oceanography  State Oceanic Administration  Qingdao  China  . Institute of Oceanology  Chinese Academy of Sciences  Qingdao  China  . Guangzhou Marine Geological Survey  Guangzhou  China  . Modern Analysis Center  Nanjing University  Nanjing  China 《中国科学D辑(英文版)》2005,(5)

The surface sediments from the eastern Pacific Ocean are mainly composed of biogenetic fossils, silicate detritus, ferromanganese spherolites and clay fractions. Among them, the clay fractions with grain size less than 2 μm (mainly clay minerals) are mostprevalent, especially in the non-calcareous sediments (the content of calcareous fossils is less than 5%), the clay fraction contents often exceed 70%[1―5]. Because of the influences of Antarctic Bottom Water (AABW), equatorial currents, …  相似文献   

A Comprehensive Investigation of an Offshore Active Fault in the Western Sagami Bay, Central Japan   总被引：1，自引：0，他引：1  

Izumi SAKAMOTO  How Kin WONG 《《地质学报》英文版》2002,76(3):300-307

Offshore active faults, especially those in the deep sea, are very difficult to study because of the water and sedimentary cover. To characterize the nature and geometry of offshore active faults, a combination of methods must be employed. Generally, seismic profiling is used to map these faults, but often only fault-related folds rather than fracture planes are imaged. Multi-beam swath bathymetry provides information on the structure and growth history of a fault because movements of an active fault are reflected in the bottom morphology. Submersible and deep-tow surveys allow direct observations of deformations on the seafloor (including fracture zones and microstructures). In the deep sea, linearly aligned cold seep communities provide indirect evidence for active faults and the spatial migration of their activities.The Western Sagami Bay fault (WSBF) in the western Sagami Bay off central Japan is an active fault that has been studied in detail using the above methods. The bottom morphology, fracture  相似文献   

金矿地理信息系统的设计与初步实现   总被引：3，自引：0，他引：3  

闻建光  许惠平  欧少佳 《世界地质》2003,22(2):196-200

地理信息系统作为一门新的科学技术，已经广泛用于资源的调查与评价。本文对庄官矿区的地质、地球物理数据进行了综合的处理和分析。在Arcview 8．1下用Geodatabase数据格式，建立了该区金矿地理数据库，并以VB6．0 MO2．1作为用户界面的开发语言。实现了金矿地理信息系统的各种分析查询功能。  相似文献   

Paleoclimate Changes during the Early Oligocene in the Hoh Xil Region, Northern Tibetan Plateau   总被引：2，自引：0，他引：2  

Alain TRENTESAUX 《《地质学报》英文版》2003,77(4)

Sedimentological, cyclic-stratigraphic, paleomagnetic, and clay-mineralogical studies on the early Oligocene Yaxicuo Group in the Hoh Xil Basin, the largest Cenozoic sedimentary basin in the hinterland of the Tibetan Plateau, provide abundant information of paleoclimate changes. A 350-m thick section in the middle-lower Yaxicuo Group was analyzed to reveal the climatic history that occurred in the Hoh Xil region during the early Oligocene interval 31.30-30.35 Ma, dated with the paleomagnetic chronostratigraphy. The results indicate that arid and cold climate dominated the Hoh Xil region during the early Oligocene in general, being related to the global cooling and drying events that occurred in the earliest Oligocene. Within this period, relatively warm and wet climate accompanied by strong tectonic activity occurred in the 31.05-30.75 Ma interval; while arid and cold climate and relatively inactive tectonics occurred in the 31.30-31.05 and 30.75-30.35 Ma intervals. Furthermore, spectral analyses of hig  相似文献   

Multi-Objective Fuzzy Optimum Design Based on Reliability for Offshore Jacket Platforms     

KANG  Haigui 《中国海洋工程》2001,(4):467-478

In consideration of the fuzzy constraint boundary and through analysis of structural reliability, a model of structural fuzzy optimum design is established based on reliability for offshore jacket platforms. According to the characteristics of offshore jacket platforms, the tolerance coefficient of the constraint boundary is determined with the fuzzy optimization method. The optimum level cut set which is the intersection of the fuzzy constraint set and fuzzy objective set, is determined with the bound search method, and then the fuzzy optimum solution to the fuzzy optimization problem is obtained. The central offshore platform SZ36-1 is designed with the fuzzy optimum model based on reliability; the results are compared with those from deterministic optimum design and fuzzy optimum design. The tendency of design variables in the above three methods and its reasons are analyzed. The results of an example show that the fuzzy optimum design based on reliability is stable and reliable.  相似文献   

Study of Disconnectable Riser Turret Mooring System Applied in the South China Sea     

Chen Jiecheng Engineer  Guangzhou Marine Engineering Corporation  Guangzhou 《中国海洋工程》1991,(3)

- The present research has been made on the Disconnectable Riser Turret Mooring (DRTM) System which could be used in the oil fields of the South China Sea. The selection of the principal dimensions and their effect on the characteristics of the system have been discussed. By means of a computer program, the synthetical appraisement has been made in the ultimate mooring condition, disconnecting condition and reconnecting condition respectively. Mean-while, a comparison has been made between DRTM system and CALM system. It has been indicated that DRTM is suitable for the South China Sea and has technological and economical preponderance.  相似文献   

A coupled ice-ocean model for the Bohai Sea I. Study on model and parameter     

SU Jie  *  WU Huiding  ZHANG Yunfei  LIU Qinzhen  BAI Shan. Key Laboratory of Physical Oceanography of State Education Ministry  Marine Environment College  OceanUniversity of China  Qingdao  China. First Institute of Oceanography  State Oceanic Administration  Qingdao  China. National Marine Environment Forecast Center  Beijing  China 《海洋学报(英文版)》2004,(4)

1 IntroductionAs an important compartment of global cli-mate system, the development and variation ofsea ice directly affect the global atmosphere andocean environment, especially the deep watersformation and circulation. Therefore, it be-comes one of the keys of the global climatestudy to explore the coupling physical processof sea ice to atmosphere and ocean in the cli-mate system and to set up the global coupledairiceocean system. The studies on the in-teraction of iceocean and its coupled…  相似文献   

东海新生代构造运动对比   总被引：1，自引：0，他引：1  

陈颐亨 《上海国土资源》1988,(2)

东海面积大、构造复杂,不同构造单元的发展史有一定差异,因而与沉积和构造圈闭发育有关的地壳运动时代、幕次的性质和表现形式的对比就为人们所关注,更主要的是它们对矿产的形成,特别是油气的聚集息息相关。为此作者据国内外有关东海的地质和地球物理资料,从生物地层学、地震地层学、同位素测年和变质期,以及岩浆活动诸方面对之进行了评述与对比,并特别强调了早第三纪末玉泉运动和中新世末龙井运动对东海油气田形成的重要意义。  相似文献   

Statistics of breaking waves and its applications to estimation of air-sea fluxes (Ⅰ)——Theoretical models   总被引：1，自引：0，他引：1  

ZHANG Shuwen & YUAN YeliKey Laboratory of Marine Science  Numerical Modeling  First Institute of Oceanography  State Oceanic Administration  Qingdao  ChinaCorrespondence should be addressed to Zhang Shuwen 《中国科学D辑(英文版)》2004,(1)

Wave breaking statistics, such as the whitecap coverage and average volume of broken seawater, are evaluated in terms of wave parameters by use of wave breaking model (Yuan et al., 1988) taking the fifth order Stokes's wave as the analog of the original wave field. Based on the observed fact that breaking waves play an important role in the exchange of mass, momentum and energy between the atmosphere and the ocean, the influence of wave breaking on air-sea fluxes of heat and moisture is investigated. Theoretical expressions of bubble-volume flux and sea spray spectrum at the sea surface and models for bubble-induced and spray droplet-induced heat and moisture fluxes are established. This work can be taken as the basis for further understanding the mechanism of air-sea coupling and parameterization models.  相似文献