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王伟  杨少敏  赵斌  黄勇  王琪 《大地测量与地球动力学》2012,32(6):29-32

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A velocity projection framework for inferring shallow water currents from surface tracer fields     

Colin Y. Shen  Thomas E. EvansRichard P. Mied  Scott R. Chubb 《Continental Shelf Research》2008

To the extent that sea surface temperature and colors can be considered passive tracers, their motions can be tracked to estimate the current velocities, or a conservation equation can be invoked to relate their temporal variations to the velocities. We investigate the latter, the so-called tracer inversion problem, with a particular focus on (1) the conditions under which the problem can be rendered over-determined for least squares solutions, (2) the possibility of using the tracer conservation equation within the “velocity projection” framework to estimate subsurface current profiles in shallow coastal waters, and (3) the accuracy of the tracer inversion calculation in terms of the data resolution and noise. The velocity projection framework refers to relating surface motion, either measured directly or made visible by tracers, to the subsurface current motion through the equations of motion. The accuracy of the tracer inversion calculation is quantified in terms of the spatial and temporal resolution of the tracer distribution. In the presence of irreducible tracer noise, the accuracy of the inversion rapidly degrades, and it is shown that the inversion with velocity projection can help improve accuracy. The tracer inversion method developed in this study is applied to the satellite sea surface temperature data, and the velocity result is compared to the velocity measurements made with the shore-based HF Coastal Current Radar. The potential of improving the velocity estimation with the present approach is indicated.  相似文献   

WebGIS技术在地震应急指挥信息系统中的应用     

杨斌  蒋晓君 《内陆地震》2008,22(1):48-54

从GIS的最新发展技术WebGIS的概念出发,研究了目前使用WebGIS的几种常见的开发方式,分析了在地震应急指挥信息系统中采用WebGIS技术对地震灾害应急指挥带来的优势,同时探讨了地震信息采集、信息处理、系统集成发布以及地震灾害评估等一系列问题的处理过程。设计研究了基于WebGIS技术建立地震应急指挥系统的理论实现过程和集成实现方案。将WebGIS技术应用在地震应急指挥信息系统中,也为处理其他灾害防御指挥信息系统提出了一种新的解决问题的途径。  相似文献   

A Review of Seismicity in 2007     

Li Gang  Liu Jie  Yu Surong 《中国地震研究》2008,22(1):101-111

1 SURVEY OF GLOBE SEISMICITY IN 2007
A total of 22 strong earthquakes with Ms ≥ 7.0 occurred in the world according to the Chinese Seismic Station Network in 2007 （Table 1 ）.  相似文献   

基于网格搜索法优化支持向量机的围岩稳定性分类模型   总被引：1，自引：0，他引：1  

袁颖  于少将  王晨晖  周爱红 《地质与勘探》2019,55(2):608-613

为科学评价围岩稳定性,本次研究借助支持向量机(SVM)处理小样本、非线性问题能力强的特性,对围岩的稳定性进行了分类。选取16组围岩数据作为学习样本,以岩石质量指标、岩石单轴饱和抗压强度、完整性系数、结构面强度系数和地下水渗水量5个指标作为模型输入,围岩稳定程度为模型输出,建立了基于支持向量机的围岩稳定性分类模型。为增强模型的推广性能,提高其预测准确率,运用改进的网格搜索方法(GSM)寻找最优的支持向量机参数,并对8组围岩数据进行预测,并同BP神经网络模型的预测结果进行对比。结果表明,建立的GSM-SVM模型对预测样本的评判结果与实际结果一致,其预测精度较BP神经网络有很大的提升。  相似文献   

Evaluation of total load sediment transport formulas using ANN   总被引：2，自引：0，他引：2  

Chih Ted YANG  Reza MARSOOLI  Mohammad Taghi AALAMI 《国际泥沙研究》2009,24(3):274-286

The calculated results from various sediment transport formulas often differ from each other and from measured data. Some parameters in the sediment transport formulas are more effective than others to estimate total sediment load. In this study, an Artificial Neural Network （ANN） model is trained using four dominant parameters of sediment transport formulas. ANN models are able to reveal hidden laws of natural phenomena such as sediment transport process. The results of ANN and some total bed material load sediment transport formulas have been compared to indicate the importance of variables which can be used in developing sediment transport formulas. To train ANN, average flow velocity, water surface slopes, average flow depth, and median particle diameter are used as dominant parameters to estimate total bed material load. Two hundreds and fifty samples are used to train the ANN model. Twenty-four sets of field data not used in the training nor calibration of ANN are used to compare or verify the accuracy of ANN and some well-known total bed material load formulas. The test results show that the ANN model developed in this study using minimum number of dominant factors is a reliable and uncomplicated method to predict total sediment transport rate or total bed material load transport rate. Results show that the accuracy of formulas in descending order are those by Yang （1973）, Laursen （1958）, Engelund and Hansen （1972）, Ackers and White （1973）, and Toffaleti （1969）. These results are similar to those made by ASCE （1982） based on laboratory and field data not used in this paper. Study results also show that the formulas based on physical laws of sediment transport, like those formulas that were developed based on power concept, are more accurate than other formulas for estimating total bed material sediment load in rivers.  相似文献   

机房动力环境监控系统     

兰陵  宋立军  周文 《内陆地震》2009,23(2):251-257

通过解决新疆维吾尔自治区地震局应急指挥中心和信息网络机房动力环境设备的控制与管理中遇到的实际问题,介绍了机房动力环境监控系统在网络机房中的应用.  相似文献   

新疆数字地震观测网络信息服务系统建设     

史勇军  陈述新  余英  罗刚 《内陆地震》2009,23(2):275-281

论述了新疆数字地震观测网络信息服务系统的项目建设概况、目标、内容以及系统建成后的网络管理、数据库、信息应用服务和资源共享等平台的基本功能和发挥的效益.  相似文献   

中国国家地震台网中心技术系统   总被引：2，自引：1，他引：1  

侯建民  黄志斌  余书明  黄静  代光辉  赵永 《地震学报》2009,31(6):684-690

“中国数字地震观测网络”项目完成后,我国的地震监测能力得到了很大提高．相比“九五”期间,“十五”计划完成后中国国家地震台网中心的技术系统得到了全面提升．新技术系统庞大而复杂,刚刚运行就成功经受了汶川MS8.0特大地震的考验．本文详细介绍了中国国家地震台网中心技术系统的整体情况及其所包含的子系统的情况．例如,全国测震实时数据流系统、国家台网实时处理系统和人机交互分析系统等．   相似文献   

基于Abaqus软件的并行计算集群平台构建与优化方法   总被引：1，自引：0，他引：1  

阚圣哲  陈国兴  陈磊 《地震学刊》2009,(6):644-651

根据有限元显式算法和隐式算法的特点,研究了岩土工程动力分析并行计算集群系统的硬件要求、集群系统的构建方法,构建了基于EM64T硬件构架、双路Intel Xeon处理器、Linux操作系统和64位Abaqus软件的32CPU并行计算集群平台,测试了存储子系统对集群性能的影响,比较了两种千兆以太网络作为、集群子网络的性能优化方法。以地下结构的地震反应分析为例,测试了优化前后该集群系统的计算速度,发现两种以太网络性能优化方法都可以有效提高集群计算速度。列举了该集群系统在深水桥梁基础流固耦合动力分析、地下结构地震反应分析和快速轨道交通环境振动分析中的应用,显示了该集群在显式算法、隐式算法及小规模、大规模数值计算问题中的并行计算效率,证明所构建的Abaqus数值模拟并行计算集群平台能够满足计算规模、计算精度和时效性的要求。  相似文献