基于移动测量数据的公路路况调查软件设计与实现     

李元博  王卫安  丁美  邓迅 《测绘与空间地理信息》2011,34(1):147-150

针对国内路况调查工作效率不高、周期长等问题,提出了将移动测量系统应用于公路路况调查的实现方案并分析其技术优势,同时,根据路况调查的业务特点,在数据准备、数据组织、系统设计和业务管理等方面进行了一些研究和尝试,实现了一个C/S架构的移动测量公路路况调查系统,最后对本应用的现实意义做出了总结.  相似文献   

河北省冰雹气候特征及其与环流异常的关系   总被引：3，自引：1，他引：2       下载免费PDF全文

顾光芹  史印山  池俊成  张梅 《高原气象》2011,30(4):1132-1138

根据1961-2007年河北省142个测站的冰雹实测资料、月平均气温和NCEP再分析资料,利用M-K突变检验、小波分析及相关分析等统计分析方法,分析了47年来河北省冰雹天气的时空分布特征、历史演变规律以及多雹年与少雹年的环流特征。结果表明,河北省冰雹日数年际变化明显,1994年有明显的突变,此后,雹日数减少了;河北冰雹...  相似文献   

基于多模式短期集合预报技术的热带气旋降水预报试验   总被引：3，自引：1，他引：2  

张亚洲  李盛林  邓文彬  梅华 《气象与减灾研究》2011,34(2):26-33

利用中尺度AREM和WRF模式为试验模式,由对降水预报结果影响颇大的积云和边界层参数化方案构成的10个集合预报成员,开展有限区域多模式短期集合预报在热带气旋降水预报中的应用与研究.分别研究了单个模式集合预报和多模式集合预报在热带气旋"天鹅"(0907)降水预报中的应用.试验结果表明:(1) WRF模式集合预报效果整体上...  相似文献   

江苏省汛期强降水过程的延伸期预报试验   总被引：1，自引：1，他引：0  

蒋薇  孙国武  陈伯民  项瑛  陶玫 《气象科学》2011,31(Z1)

针对汛期延伸期降水预报问题,根据大气低频振荡特性,运用低频天气图预报方法,通过分析关键区低频天气系统(低频气旋和低频反气旋)的活动特征,建立低频系统与强降水过程间的对应关系,通过低频系统的活动特征来预报降水过程.在2011年7-9月江苏省延伸期强降水过程预报试验中,低频天气图预报方法的预报效果较好,且预报时效为10 ～30 d,可以在延伸期业务预报中加以应用.此外,还运用模式统计降尺度方法预报降水落区,为强降水过程的发生提供背景依据和参考信息,具有一定的实用意义.  相似文献   

The factors controlling the partitioning of polybrominated diphenyl ethers and polychlorinated biphenyls in the water-column of the Pearl River Estuary in South China   总被引：1，自引：0，他引：1  

Chen MY  Yu M  Luo XJ  Chen SJ  Mai BX 《Marine pollution bulletin》2011,62(1):29-35

In this study, the distribution and partition of polybrominateddiphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in water from the Pearl River Estuary were investigated. A seasonal dependence for dissolved and particle phase PCB and PBDE levels was observed. A high dissolved phase level occurred in the dry season. The positive correlation between POC content in the particles and phase distribution coefficients (K_p) suggested that POC may play an important role in determining the partition of PBDEs and PCBs. A linear correlation between the observed log K_OC and log K_OW for PBDEs and PCBs was found with slopes less than one. The observed log K_OC values were lower than the predicted log K_OC values for PBDEs (except for BDE28). The log K_OC values were higher than the predicted values for PCBs. A combination of sorption to colloids (10-98% for PBDEs and less than 25% for PCBs) and adsorption to BC was responsible for this observation.  相似文献   

"电纸"服务平台的研制     

方梅  余家树  吴利民 《地理空间信息》2011,9(1):71-72

从GIS平民化服务的角度,研制一种"电纸平台",即把纸质地图和电子地图的展现方式融为一体,使其优势互补,在老百姓应用和享受地理信息成果时,既能像纸质地图一样,一目了然,使用方便,又能具有电子地图海量数据库的支持,灵活方便展现、更新和网络化操作.  相似文献   

LA–ICP–MS U–Pb zircon geochronology, geochemistry and kinetics of the Wenquan ore-bearing granites from West Qinling, China     

Xiaofeng Cao  Xinbiao Lü  Shuzhen Yao  Wei Mei  Xiaoyan Zou  Chao Chen  Shentai Liu  Ping Zhang  Yuyun Su  Bin Zhang 《Ore Geology Reviews》2011,43(1):120-131

Many hydrothermal Cu–Mo–Au deposits related to granitoid intrusives were recently discovered in the West Qinling Orogenic Belt (WQOB). These deposits were mainly formed during the late Indosinian epoch (ca. 214 Ma), and the regional geological setting of Cu–Mo ore formation in WQOB during this epoch is poorly understood until now. This paper describes the geochronology and geochemistry of the Wenquan ore-bearing pluton, a composite granite body, to study the geologic background of magmatic emplacement and ore formation. The Mo mineralisation occurs at the contact between a fine-grained biotite monzogranite and a medium- to fine-grained porphyritic monzogranite. Zircon ²⁰⁶Pb/²³⁸U ages of 223 ± 3 Ma (biotite monzogranite) and 225 ± 3 Ma (porphyritic monzogranite) were obtained. Geochemical analyses show that the Wenquan pluton is a high-K calc-alkaline to shoshonite series rock with relatively high LREE and low HREE and a moderate to weak negative Eu anomaly. Relatively negative anomalies of Ba, Ti, P, Nb, Ta also exist. These results imply that the Wenquan pluton was emplaced during a transitional process (from collision to extension) between the Yangtze Craton and North China Craton. During the later Indosinian epoch, the East Qinling Orogenic Belt (EQOB) and WQOB had similar tectonic settings, and intensive magmatic activity and Mo mineralisation occurred. The EQOB was then involved in the Mesozoic subduction of the Pacific plate, and its subsequent tectonic evolution was different from that of the WQOB.  相似文献   

Geochemical Characters of Water Coproduced with Coalbed Gas and Shallow Groundwater in Liulin Coalfield of China     

YANG Mei  JU Yiwen  LIU Guijian  TONG Li  KANG Yu  HOU Quanlin 《《地质学报》英文版》2013,87(6):1690-1700

To reveal the geochemical characters of water coproduced with coalbed gas and shallow groundwater,water samples were collected from 12 wells of coalbed methane and 7 wells of shallow groundwater.The pH,CODMn,fCO2,total dissolved solids （TDS）,total hardness,and concentrations of metasilicic acid,sodium and kalium,calcium ion,magnesium ion,ammonium iron,bicarbonate ion,carbonate,chloride,sulfate ion,nitrate ion,fluoride,lithium,zinc,nickel,manganese,iron,boron,barium,etc.of the samples were measured.Research results showed the following：（1） Concentrations of TDS,chloride,fluoride,sodium and kalium,ammonium,iron,and barium in the water coproduced with coalbed gas exceeded the national standards of China; however,physical,chemical,and biological properties of shallow groundwater could meet the national standard.（2） The water produced from coalbed contained mainly Na-Cl·HCO3,with average TDS of 4588.5 ppm,whereas shallow groundwater contained a mixture of chemicals including Na.Mg.Ca-HCO3·SO4 and Na.Mg-HCO3·SO4,with average TDS of 663.8 ppm.（3） In general,it was observed that bicarbonate and sodium accumulated in a reducing environment and deeper system,while depletion of hydrogen ions and dissolution of sulfate,calcium,and magnesium occurred in a redox environment and shallow system.（4） Sodium and kalium,ammonium,chloride,and bicarbonate ions were the main ions found in the study area.  相似文献   

柴北缘锡铁山两类榴辉岩的退变质过程及其对俯冲带折返机制的制约     

张聪  田作林  张立飞  黄杰  陈梅 《中国区域地质》2013,(12):2044-2054

榴辉岩作为俯冲带中重要的岩石类型保存有丰富的地球动力学信息。对榴辉岩及其退变质岩石的研究有助于建立俯冲带演化的p-T轨迹,了解俯冲岩石在折返过程中温压条件及矿物相的变化,从而对俯冲带折返的动力学机制进行限定。对柴北缘锡铁山双矿物榴辉岩及含多硅白云母榴辉岩进行了详细的岩石学研究。在NC（K）FMASH体系中对两类榴辉岩进行变质相平衡模拟,得到双矿物榴辉岩的峰期温压条件为745～790℃,大于2．8～3．0GPa（M1）,后经历等温降压过程达到角闪石榴辉岩岩相（670～770℃,1．6～2．2GPa,M2）,与含多硅白云母榴辉岩经历了相同的折返过程。锡铁山双矿物榴辉岩的原岩具有N-MORB的地球化学特征,而含多硅白云母榴辉岩则显示E-MORB或者OIB特征,二者原岩成分存在明显差异。两类榴辉岩的p-T演化过程和地球化学特征表明．锡铁山双矿物榴辉岩与含多硅白云母榴辉岩矿物学特征的差异是其原岩的多源性造成的,而与俯冲后折返过程中的退变质作用无必然联系。  相似文献   

U–Pb and Re–Os Geochronology of Karamay Porphyry Mo–Cu Deposit in Western Junggar,NW China     

Ran Wang  Yong‐Jun Li  Xin Han  Jun‐Nian Wang  Jing Yan  Yu‐Mei Zhao 《Resource Geology》2013,63(4):412-420

The Karamay porphyry Mo–Cu deposit, discovered in 2010, is located in the West Junggar region of Xinjiang of northwest China. The deposit is hosted within the Karamay granodiorite porphyry that intruded into Early Carboniferous sedimentary strata and its exo‐contact zone. The LA‐ICPMS U–Pb method was used to date the zircons from the granodiorite samples of the porphyry. Analyses of 12 spots of zircons from the granodiorite samples yield a U–Pb weighted mean age of 300.8 ± 2.1 Ma (2σ). Re–Os dating for five molybdenite samples obtained from two prospecting trenches and three outcrops in the deposit yield a Re–Os isochron age of 294.6 ± 4.6 Ma (2σ), with an initial ¹⁸⁷Os/¹⁸⁸Os of 0.0 ± 1.1. The isochron age is within the error of the Re–Os model ages, demonstrating that the age result is reliable. The Re–Os isochron age of the molybdenite is consistent with the U–Pb age of the granodiorite porphyry, which indicates that the deposit is genetically related with an Early Permian porphyry system. The ages of the Karamay Mo–Cu deposit and the ore‐bearing porphyry are similar to the ages of intermediate‐acid intrusions and Cu–Mo–Au polymetallic deposits in the West Junggar region. This consistency suggests the same geodynamic process to the magmatism and related mineralization.  相似文献