Groundwater Systems and Eco-hydrological Features in the Main Karst Regions of China     

LU Yaoru  ZHANG Feng''e  LIU Changli  TONG Guobang  ZHANG Yun Chinese Academy of Geological Sciences  Beijing Institute of Hydrogeology  Environmental Geology  Chinese Academy of Geological Sciences  Shijiazhuang  Hebei 《《地质学报》英文版》2006,80(5):743-753

1 Introduction Karst topography is widespread in China (Lu et al., 1973; Lu, 1986a), but its basic features are quite different in the main karstified areas in southern and northern China (Lu, 1999, 2003). The karst development appears to differ not only in the karst geomorphological types but also in the forms of the different karst water systems. The eco-hydrological features have obviously been influenced by human activities. The eco-hydrogeology is thus of great importance to study. Th…  相似文献   

不同实验条件下软质岩石地基承载力分析     

张云  杨忠 《贵州地质》2006,23(2):137-141

现行《岩土工程勘察规范》(GB50021-2001)及《建筑地基基础设计规范》(GB50007-2002)规定,确定岩石地基承载力特征值常用方法有取岩样作室内试验和现场原位载荷试验等。软质岩的岩石试样作室内试验时,因环境条件与实地有明显的差异,试验结果多不理想,现场静载试验在实际环境条件下进行,能更好地挖掘软质岩石地基承载力特征值的潜力,减少基础工程造价。  相似文献   

关于VTI介质中多分量转换波地震数据采集的最佳接收时窗   总被引：6，自引：1，他引：6       下载免费PDF全文

芦俊  王赟  石瑛 《地球物理学报》2006,49(1):234-243

以P_P波时窗和P_SV波时窗的交叉部分作为VTI介质中P_P波、P_SV波联合采集的最佳时窗，在有效时窗内通过基于VTI介质的射线追踪法确定每个反射点的P_P波、P_SV波射线路径和相角，求解Zoeppritz方程得出P_SV波与P_P波反射系数(或透射系数)的比值，并将该比值的绝对值定义为控制因子G. 以G值作为控制VTI介质中P_P波、P_SV波联合采集观测系统设计的主要参数，通过分析G值确定检波器位置的最佳接收时窗，得出优化VTI介质中多分量转换波地震数据采集的接收时窗的方法.  相似文献   

用红外云图估算热带气旋短时雨量     

胡波  杜惠良  滕卫平  肖云 《气象》2006,32(1):74-77

以热带气旋降水云区的云顶亮温和1小时云顶亮温差为BP人工神经网络的输入层，以实况1小时的雨量为人工神经网络的输出层，建立了4类人工神经网络预报模型，分别为点模型、线模型、小面模型和大面模型。通过大量的人工神经网络试报表明小面模型能较好地抓住热带气旋红外云图中的主要降水影响因子（移向、移速、云顶亮温、发展率、云顶亮温梯度），具有“过拟合”现象低、泛化性能高、预报能力强等特点。  相似文献   

利用GRACE轨道和加速度数据恢复地球重力场     

肖云夏哲仁  王兴涛 《测绘科学与工程》2006,26(2):8-10

本文基于高低卫卫跟踪的模式，用积分方法研究了不同重力场模型对于轨道的影响，并用3个月的GRACE轨道数据计算了新的60阶地球重力场模型，为了分析其精度，与EGM96和EIGENIS作了比较．结果表明新模型在40阶前更接近GGM02C模型。  相似文献   

商城库区气候生态资源开发利用研究     

刘召华  王金海  杨云 《气象与环境科学》2006,(2):60-61

分析结果表明,商城库区气候温和,热量变化平缓,降水充沛,空气湿度大,雾日多,大部分时间库区水温高于气温.库内应以生态资源开发为主,发展水上交通运输、旅游观光、水产养殖业;库区周边陆地应以气候资源开发为主,发展畜牧业生产,扩大茶、果等特种经济林木种植规模.  相似文献   

江苏省县（市）防震减灾宣传工作综合调查     

凌云 《国际地震动态》1998,(12):26-30

文章对江苏省１０个县（市）的防震减灾宣传工作的组织管理、宣传内容、宣传形式、宣传队伍建设和社会效果几个方面进行了抽样调查,分析了各地防震减灾宣传工作的状况,提出了今后防震减灾宣传工作的思路。  相似文献   

A preliminary research establishing the present-time intraplate blocks movement model on the Chinese mainland based on GPS data   总被引：4，自引：0，他引：4  

Shuo-Yu Zhou  Yue-Gang Zhang  Guo-Yu Ding  Yun Wu  Xiao-Jun Qin  Shun-Ying Shi  Qi Wang  Xin-Zhao You  Xue-Jun Qiao  Ping Shuai  Gan-Jin Deng 《地震学报(英文版)》1998,11(4):403-412

The Chinese mainland is regarded as the best area for studying the continental crustal movement and dynamics. In the past, based on the ground surface observation, it was very difficult to study the movement of the intraplate blocks within a range of larger space and a time scale of several years quantitatively. In this paper, a method of calculating the Euler vectors of present-time motion among blocks by using Cardan angles has been given completely based on two periods of GPS repetition measurement data of the National Ascending Plan of China (NAPC) — the study and application of current crustal movement and geodynamics in 1994 and 1996. A present-time blocks movement model on the Chinese mainland (PBMC-1), which describes the motion of seven blocks—Tibet, Chuan-Dian, Gan-Qing, Xinjiang, South China, North China and Heilongjiang block, is established preliminarily. The velocity field of the relative motion among the intraplate blocks and boundary motion in the Chinese mainland are firstly given within several years time scale. It is shown by the results calculated with the model that the velocity-rate of each block is reduced gradually from the south to north and from the west to east, and the motion direction changes gradually from NNE to E, even SEE or SE. The collision of Indian plate plays a leading role in the movement of the intraplate blocks in the Chinese mainland, while the motion manner and velocity-rate of block boundary zone (fracture zone) depend on the motion of every block again. The present-time motion of a time scale of several years computed with the model is not only largely consistent with the average motion of a time scale of several million years derived from geology, but also very coincident with the results of geophysical and astronomic observation. It is shown preliminarily that the observed results of space geodesy techniques such as GPS etc. are capable of discovering the crustal movement at present. This study is supported by the National Natural Science Foundation of China (NNSFC), National Ascending Plan of China (NAPC) and Chinese Joint Seismological Science Foundation (CJSSF).  相似文献   

模型反演折射静校正方法及软件技术     

戴云  钟本善  江玉乐 《矿物岩石》1998,(Z1)

本文叙述了模型反演折射静校正的一般原理。首先介绍了折射初至波的自动拾取,其次介绍了最佳拟合旅行时反演。在软件实现中本文提出了几项技术包括提高初至拾取的准确率及初至结果的质量评价,如何使系统对不同地震数据格式具有通用性;静校效果的初步评估。本文的方法和技术在实际生产应用中广泛使用。  相似文献   

Study on Liquefying Simulation Test of Retaining Structure Ground of Kobe Port     

Fang Yun  Ghalandarzadeh A. 《中国地质大学学报(英文版)》1998,9(2)

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