如何确定对场地地震危险性贡献量最大的潜在震源区   总被引：2，自引：0，他引：2       下载免费PDF全文

韩竹军  张裕明  于贵华 《地震地质》1999,21(4):443-451

分别以北京市清河镇和密云水库大坝邻近地区作为场地,讨论了贡献量最大潜在震源区的确定问题。对于北京市清河镇场地,不同周期下对场地贡献量最大的潜在震源区都是北京潜在震源区;但对于密云水库大坝邻近地区,在年超越概率小于1-00E- 2 条件下,短周期( T= 0-1s) 时对场地贡献量最大的潜在震源区是怀柔潜在震源区,而长周期( T= 1-0s) 时对场地贡献量最大的潜在震源区是夏垫潜在震源区。这种变化说明近源在短周期时所起作用较为明显,而远源对长周期部分的贡献量增大。区分不同周期下贡献量最大的潜在震源区,对于确定期望地震或设定地震以及计算场地地震动持续时间等参数是重要的  相似文献   

Damage and Seismic Intensity in the Meizoseismal Region of the M_S8.0 Wenchuan Earthquake,Sichuan,China     

Yang Zhu’en  Deng Zhihui  Ma Wentao  Sun Qian  Chen Guihua 《中国地震研究》2009,23(1):28-33

This paper presents the damage in the meizoseismal region of the Ms8.0 Wenchuan earthquake, Sichuan, China, and the seismic intensifies determined according to "the Chinese Seismic Intensity Scale", and discusses briefly the types of earthquake-generating faults and some features of seismic damage.  相似文献   

《中国图书馆分类法·地震学专业分类表》的编制修订   总被引：1，自引：0，他引：1  

付桂华 《国际地震动态》2008,(8)

本课题是"十五"期间地震科技信息发展的重点课题之一. 运用文献分类技术方法, 对<中国图书馆分类法>(第4版)中的地震学类目进行了扩充, 客观地反映了防震减灾事业的发展, 并将相关类目纳入<中国图书馆分类法>(第5版)中.  相似文献   

碧塔海景区旅游活动对湿地生态环境影响研究   总被引：11，自引：0，他引：11  

王金亮  王平  鲁芬  杨桂华 《地理科学进展》2004,23(5):101-108

碧塔海湿地是最能体现“香格里拉”意境的景区之一,它强烈地吸引着国内外游客,成为香格里拉风景区的重中之重。在野外调查与室内分析的基础上,分析了碧塔海旅游活动的时空分布特点及其对湿地土壤物理性质及植物的影响。结果表明,愈靠近旅游路线,旅游活动时间愈长,旅游活动对土壤性质和植物的影响愈大,但不同压力条件下,这种影响明显不同。因而应该积极采取措施保护该地湿地生态环境。  相似文献   

Advances in research of the mid-deep South China Sea circulation     

Wang  Dongxiao  Wang  Qiang  Cai  Shuqun  Shang  Xiaodong  Peng  Shiqiu  Shu  Yeqiang  Xiao  Jingen  Xie  Xiaohui  Zhang  Zhiwei  Liu  Zhiqiang  Lan  Jian  Chen  Dake  Xue  Huijie  Wang  Guihua  Gan  Jianping  Xie  Xinong  Zhang  Rui  Chen  Hui  Yang  Qingxuan 《中国科学:地球科学(英文版)》2019,62(12):1992-2004

The South China Sea(SCS) is a large marginal sea connecting the Indian and Pacific oceans.Under the factors of monsoons,strait transport,and varied bathymetry,the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open ocean.Theoretical analysis and observations reveal that internal tides,internal solitary waves,and strong winds are the sources of the strong mixing in the northern SCS.A major consequence of the strong mixing is an active mid-deep circulation system.This system promotes exchange of water between the SCS and adjacent oceans,and also regulates the upper layer of wind-driven circulation,making the 3 dimensional SCS circulation clearly different from that in other tropical and subtropical marginal seas.The mass transport capacity of the mid-deep circulation has a substantial impact on marine sedimentation,the biogeochemical cycle,and other processes in the SCS.This paper summarizes the recent advances in middeep sea circulation dynamics of the SCS,and discusses the opportunities and challenges in this area.  相似文献   

移动终端的水上便携智能导航系统研发     

彭文  王立平  陈贵花 《测绘通报》2016,(6):133-137

介绍了一种基于移动终端设备(Windows、iOS、Android)的水上便携智能导航系统的需求分析、主要功能及设计与实现,分析了主要技术难点和系统特点,并对其在船舶导航、智慧引航、电子海图自动更新等方面的应用技术进行了探讨。  相似文献   

天气形势对哈尔滨市空气质量影响的初步研究   总被引：15，自引：0，他引：15  

袁美英  周秀杰  张桂华  李铁  潘华盛 《气象》2005,31(1):55-58

应用2000～2003年哈尔滨市三年来空气污染物浓度资料,研究空气质量与天气形势的关系,总结出哈尔滨市冬春两季空气污染的主要天气形势特征,研制了哈尔滨市空气质量天气图客观预报方法。  相似文献   

Influence of Vegetation Characteristics on Soil Denitrification in Shoreline Wetlands of the Danjiangkou Reservoir in China     

Wenzhi Liu  Guihua Liu  Quanfa Zhang 《洁净——土壤、空气、水》2011,39(2):109-115

Soil denitrification in reservoir shoreline wetlands is an important process for removing excess inorganic nitrogen from upland runoff and controlling eutrophication in aquatic ecosystems. As yet, little is known about the influence of vegetation characteristics on the soil denitrification potential in reservoir shoreline wetlands, although vegetation can affect both denitrifying bacteria and soil properties. In this study, we measured the spatial variability of denitrification enzyme activity (DEA) using acetylene block method in shoreline wetlands of the Danjiangkou Reservoir, a water source of the South‐to‐North Water Transfer Project in China. Results indicated that DEA ranged from 0.001 to 2.449 µg N (N₂O) g^?1 h^?1, with a mean of 0.384 µg N (N₂O) g^?1 h^?1. DEA varied significantly among five representative plant communities and the highest DEA (0.248–2.449 µg N (N₂O) g^?1 h^?1) was observed in the Polygonum hydropiper community. Plant biomass and vegetation cover were significantly and positively related to DEA and together explained 44.2% of the total variance. These results suggest that vegetation characteristics should also be considered in assessing soil denitrification capacity and restoring shoreline wetlands for nitrogen pollution removal in the Danjiangkou Reservoir after dam heightening.  相似文献   

Hydrocarbon Generation Kinetic Characteristics from Different Types of Organic Matter     

WANG Min  LU Shuangfang  XUE Haitao  WANG Weiming  LIU Min  DONG Qi  WANG Guihua 《《地质学报》英文版》2011,85(3):702-711

In order to contrast the hydrocarbon generation kinetic characteristics from different types of organic matter (OM), 18 samples from different basins were pyrolyzed using Rock-Eval-II apparatus under the open system. From the experimental results, the curve of hydrocarbon generation rate vs. temperature can be easily obtained, which usually can be used to optimize kinetic parameters (A, E, F) of the hydrocarbon generation model. In this paper, the parallel first-order reaction with a single frequency factor model is selected to describe the hydrocarbon generation kinetic characteristics. The hydrocarbon generation kinetic parameters reveal that the types of compound structures and chemical bonds of the lacustrine facies type I OM are relatively homogeneous, with one dominating activation energy. The types of chemical bonds of the lacustrine facies type II2 OM and the terrestrial facies type III OM are relative complex, with a broad activation energy distribution, and the reaction fraction of the preponderant activation energy drops with the decrease of hydrogen index. The impact of the activation energy distribution spaces on the geological extrapolation of kinetic parameters is also investigated. The results show that it has little effect on the hydrocarbon transformation ratio (TR) and therefore, the parallel first-order reaction model with proper number of activation energies can be better used to describe the hydrocarbon generation process. The geological extrapolation results of 18 samples of kinetic parameters show that the distribution range of the hydrocarbon generation rate of the type I OM is relatively narrow and the hydrocarbon generation curve is smooth. In comparison, the distribution range of the hydrocarbon generation for type II1 and type II2-III OM are quite wide, and the hydrocarbon generation curves have fluctuation phenomena. The distribution range of the hydrocarbon generation rate and the fluctuation phenomena are related to the kinetic parameters of OM; the narrower the activation energy distribution, the narrower the hydrocarbon generation rate distribution, and the smoother the hydrocarbon generation curve, and vice versa.  相似文献   

Different effects of tropical cyclones generated in the South China Sea and the northwest Pacific on the summer South China Sea circulation     

Zheng Ling  Guihua Wang  Chunzai Wang  Zhi-Song Fan 《Journal of Oceanography》2011,67(3):347-355

Tropical cyclones (TCs) that affect the South China Sea (SCS) can be generated in either the SCS or the northwestern Pacific (NWP). Using satellite measurements, the Sverdrup theory and a 1.5-layer nonlinear reduced gravity model, the present paper investigates the effects of SCS and NWP TCs on the summer SCS upper layer ocean circulation. Both SCS and NWP TCs enhance the summer mean circulation pattern of the cyclonic gyre in the northern SCS and the anti-cyclonic gyre in the southern SCS. However, the effect of SCS TCs is much larger than that of NWP TCs, although the number of SCS TCs is smaller than NWP TCs. This is because the SCS TCs-induced wind stress curl pattern is favorable for enhancing the summer SCS mean circulation.  相似文献