Correlation Between Total Lightning Activity and Precipitation Particle Characteristics Observed from 34 Thunderstorms     

ZHENG Dong  MENG Qing  ZHANG Yijun  DAI Jianhu  ZHONG Min 《Acta Meteorologica Sinica》2010,24(6):776-788

A total of 34 thunderstorms around Shanghai and Wuhan of China are analyzed in order to determine the relationship between total lightning activity and precipitation particle characteristics.Precipitation particle concentration data are obtained from the 2A12 product of TRMM/TMI(Tropical Rainfall Measuring Mission/TRMM Microwave Image) and lightning activity data are from the TRMM/LIS(Lightning Imaging Sensor) and SAFIR3000(Surveillance et Alerte Founder par Interferometric Radioelectirque).On a spatial ...  相似文献   

Study on Flow Field Around Vertical Breakwater Under Different Overtopping Conditions Based on Numerical Simulation     

蒋学炼  吴米玲  李炎保 《中国海洋工程》2010,(4)

A numerical wave flume is constructed based on the Reynolds Averaged Navier-Stokes (RANS) equations with turbulence closure by a modified k-ε model to study the viscous interactions of waves with vertical breakwaters for different overtopping cases. The governing equations,the turbulence model,boundary conditions,and solution method for the numerical wave flume are introduced briefly. The reliability of the numerical wave flume is examined by comparing the numerical results with the experimental measurement...  相似文献   

Geospatial Information Service Based on Digital Measurable Image——Take Image City·Wuhan as an Example   总被引：1，自引：0，他引：1  

LI Deren  SHEN Xin State Key Laboratory of Information Engineering in Surveying  Mapping  Remote Sensing  Wuhan University  Luoyu Road  Wuhan  China 《地球空间信息科学学报》2010,(2)

LBS (location-based service) is a remarkable outcome of the development from GIS to geospatial information service. Faced by the requirements of geospatial information from the masses and the opportunity provided by the next generation Internet and Web 2.0, a new model of geospatial information service based on DMI (digital measurable image) is presented. First, the concept of LBS and the opportunities of Web 2.0 are introduced, then the characteristic of DMI is discussed. Taking the Image City·Wuhan as an ...  相似文献   

上海市土地有形市场管理信息系统     

白继伟 《国土资源信息化》2010,(1):35-39

本文首先介绍了上海市土地有形市场管理信息系统的建设目标和内容,其次从系统的体系架构、与其他现有系统间的关系、系统功能设计和技术路线等方面详细介绍了系统实现的技术方案,然后总结了系统运行的五个特点,最后介绍了系统的运行情况。  相似文献   

Climatic characteristics of convective and stratiform precipitation over the Tropical and Subtropical areas as derived from TRMM PR   总被引：4，自引：0，他引：4  

LIU Peng  LI ChongYin  WANG Yu  FU YunFei 《中国科学:地球科学(英文版)》2013,(3):375-385

Climatic characteristics of convective and stratiform precipitation over the Tropical and Subtropical areas are investigated based on the measurements of Tropical Rainfall Measuring Mission’s(TRMM) Precipitation Radar(PR) from 1998 to 2007.Results indicate that convective precipitation are distributed mainly over the Intertropical Convergence Zone(ITCZ),the South Pacific Convergence Zone(SPCZ),the Asian Monsoon Region,regions between the South America and the Mid-America,and the Tropical Africa where the frequencies lie between 1% and 2%.But in four seasons,total area fractions of convective precipitation frequencies less than 1% all exceed 85%.The frequencies of stratiform precipitation are much higher than those of convective precipitation,and total area fractions of stratiform precipitation frequencies >1% are over 55% during four seasons.However,frequencies of the two rain types show not only remarkable regionality,but also distinct seasonal variations.Conditional rain rates of convective precipitation range from 6 to 14 mm/h whereas those of stratiform precipitation are smaller than 4 mm/h.Meanwhile,rain tops of convective precipitation are higher than those of stratiform precipitation.The mean profiles of the two rain types show significant latitudinal dependency.And the seasonal variations of precipitation profiles are displayed mainly in the variations of rain tops.The frequencies and conditional rain rates of both rain types over ocean are higher than those over land,but rain tops are just the opposite.Moreover,the seasonal variations of both rain types over ocean are weaker than those over land because of the different stable states of underlying surfaces.  相似文献   

Physics of Seismic Source Ⅲ. Statistical Mechanics of Earthquakes     

Chen Yuntai  Wu ZhongliangInstitute of Geophysics  CSB  Beijing  China 《中国地震研究》1999,(2)

The statistical mechanics of earthquakes adopts the concepts and methodology of statistical mechanics, especially the theory of critical phenomena, in studying the preparation, initiation, propagation and healing of earthquake rupture, which forms a new branch in the physics of seismic source in recent years. This article introduces to the fundamental concepts of the statistical mechanics of earthquakes. The introduction includes the seismic Hamiltonian, percolation model, earthquake rupture nucleation, and Burridge-Knopoff spring-block model. It is pointed out that some of the statistical mechanical models of earthquakes have a sound seismological basis. There is a smooth "transition" from the "classical" theory to the "modern" theory of seismic source.  相似文献   

A preliminary report on the recent eruptions of Hibok-Hibok volcano,Camiguin Island,Philippines     

Philippine Geodetic  Geophysical Institute 《Bulletin of Volcanology》1952,12(1):215-225

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SOME NOTES ON THE CONTACT BETWEEN THE YANGFANG GRANITE AND THE OVERLYING TIAO-CHI-SHAN BEDS.     

朱森  黄汲清 《地质学报》1928,(Z1)

Early in July, 1928, Mr. H. K. Lin, the noted lawyer of Peking, approached Dr. W. H. Wong, director of the Geological Survey of China, for solution of some water supply problems, recently arisen in a tract of hilly land (of which Mr. Lin is the owner) in the eastern foot of the Mont Miao FengShan  相似文献   

ON THE OCCURRENCE OF LYTTONIA FAUNA IN THE VICINITY OF KWEI-YANG,KWEI-CHOW PROVINCE     

乐森璕 《地质学报》1927,6(1):51-52

The so-called Lyttonia Fauna in its broader sense, is known at presentto have an universally wide geographical distribution. It had been reportedoccurring in Texas and Canada of North America; Palermo of Mediterranean  相似文献   

BRIEF NOTE ON REDDISH BROWN SANDSTONE FORMA TION AND TERRACE DEPOSIT IN NORTHERN SOUTH MANCHURIA     

JUKICHI HATA 《地质学报》1927,6(1):38-42

As regards to the geological features of the vast area in the northernSouth Manchuria which extends from the north of Kaiyuan(开原) to theneighbouring districts of Harbin, no detailed survey report has yet been  相似文献