ARTIFICIAL NEURAL NETWORK CORRECTION OF ROUGH ERRORS OF OBSERVATIONS   总被引：1，自引：0，他引：1       下载免费PDF全文

蒋国荣  张韧  沙文钰  阎俊岳  姚华栋 《Acta Meteorologica Sinica》2002,(1)

In the context of tower measured radiation datasets.following the correction principle meetinga diagnostic equation in data quality control and in terms of a technique for model construction ondata and ANN(artificial neural network)retrieval for BP correction of radiation measurementswith rough errors available,a BP model is presented.Evidence suggests that the developed modelworks well and is superior to a convenient multivariate linear regression model,indicating its wideapplications.  相似文献   

EH-4系统观测资料的非远区场校正研究   总被引：6，自引：1，他引：6  

昌彦君  王华军  罗延钟 《吉林大学学报(地球科学版)》2002,32(2):177-180

EH－4系统实测的卡尼亚视电阻率在非远区场时应作必要的校正。基于导出的EH－4系统的卡尼亚电阻率ρxy和ρyx的表达式，采用多项式分段逼近的方法，建立EH－4系统测深数据的全频域的视电阻率算法。根据建立的算法对均匀大地、二层大地和三层大地模型的EH－4系统测深数据进行非远区场校正的结果表明：均匀大地时，全频域的视电阻率与真电阻率吻合很好，D型、K型和Q型断面的视电阻率曲线与MT法的接近，G型、H型和A型的视电阻率曲线得到很大改善。  相似文献   

Numerical Analysis of Space–Time Finite Element Formulations for Miscible Displacements     

Rigoberto G. Sanabria Castro  Sandra M. C. Malta  Abimael F. D. Loula  Luiz Landau 《Computational Geosciences》2002,5(4):301-330

A finite element formulation is proposed to approximate a nonlinear system of partial differential equations, composed by an elliptic subsystem for the pressure–velocity and a transport equation (convection–diffusion) for the concentration, which models the incompressible miscible displacement of one fluid by another in a rigid porous media. The pressure is approximated by the classical Galerkin method and the velocity is calculated by a post-processing technique. Then, the concentration is obtained by a Galerkin/least-squares space–time (GLS/ST) finite element method. A numerical analysis is developed for the concentration approximation. Then, stability, convergence and numerical results are presented confirming the a priori error estimates.  相似文献   

一种计算固体潮观测数据改正值的新方法     

熊先保 《地震研究》2002,25(4):346-350

从标定前一天和标定当天的地形变前兆数据变化趋势入手，在分析当天数据结构的基础上采用最小二乘法原理，提出了一种计算数采改正值的新方法。经典型实例计算表明，该方法精度较高，效果明显。并对误差的来源作了进一步的分析。  相似文献   

ARTIFICIAL NEURAL NETWORK CORRECTION OF ROUGH ERRORS OF OBSERVATIONS^*          下载免费PDF全文

JIANG Guorong  ZHANG Ren  SHA Wenyu  YAN Junyue  YAO Huadong 《Acta Meteorologica Sinica》2002,16(1):123-132

In the context of tower measured radiation datasets.following the correction principle meeting a diagnostic equation in data quality control and in terms of a technique for model construction on data and ANN (artificial neural network) retrieval for BP correction of radiation measurements with rough errors available,a BP model is presented.Evidence suggests that the developed model works well and is superior to a convenient multivariate linear regression model,indicating its wide applications.  相似文献   

Precise revision of the garnet-muscovite geothermometer     

吴春明  赵英俊 《中国科学D辑(英文版)》2002,45(3):270-279

The garnet-muscovite geothermometer was refined through empirical calibration by using natural rocks metamorphosed under the physical conditions of 238—1306 MPa and 490—700℃. Input temperatures and pressures were determined through simultaneously applying the garnet-biotite geothermometer and the garnet-biotite-plagioclase-quartz barometer, assuming that all FeO in muscovite and garnet be ferrous. Garnet was treated as the asymmetric quaternary solid solution, and muscovite as the symmetric binary solid solution. Input muscovite compositions include Fe atoms between 0.03—0.19 and Mg atoms between 0.04—0.16 on the basis of 11 oxygen atoms, and input garnet compositions include spessartine fractions between 0.01—0.289, grossular fractions between 0.028—0.273, and the Fe/Mg ratio between 3.387-18.986. The resulting garnet-muscovite geothermometer reproduces temperatures within (50℃ compared with the garnet-biotite thermometer. Total random error of ±37℃ of the new thermometer may stem from the pressure uncertainty of ±200 MPa, and uncertainties of ±5% of Fe and Mg components in muscovite, and ±5% of Fe, Mg, Mn and Ca components in garnet, altogether. When there exist 10%, 20%, 30%, 40% and 50% Fe3+ in muscovite, respectively, the computed garnet-muscovite temperatures will be 1—6℃, 2—12℃, 3—16℃, 5—24℃ and 7—29℃, respectively, lower than those obtained when assuming that all FeO be ferrous. The new garnet-muscovite geothermometer can efficiently reflect temperature change of typical prograde sequences and contact aureole rocks, and may be applied to low- to high-grade and low- to high-pressure metamorphic rocks.  相似文献   

Data and model uncertainty estimation for linear inversion   总被引：1，自引：0，他引：1  

Kasper van Wijk  John A. Scales  William Navidi  Luis Tenorio 《Geophysical Journal International》2002,149(3):625-632

  相似文献   

GPS在地面沉降监测中的应用探讨   总被引：5，自引：0，他引：5  

徐建芳  张发旺  张进才 《地理与地理信息科学》2003,19(5):43-45

利用GPS进行地面沉降监测能够解决传统测量方法工作量大、周期长的问题。该文结合实例，论述了GPS在地面沉降监测中的应用，分析了GPS测量方法的优点和误差，提出了GPS测量地面沉降的适用条件。  相似文献   

天山1号冰川厚度和冰下地形探测与冰储量分析   总被引：12，自引：0，他引：12       下载免费PDF全文

孙波  何茂兵  张鹏  焦克勤  温家洪  李院生 《极地研究》2003,14(1):35-44

通过对天山乌鲁木齐河源 1号冰川的雷达回波探测 ,清晰地揭示出冰川底部冰 /岩界面的位置及其起伏变化特征 ,显示出雷达波对山地冰川良好的穿透能力和对冰下地形的高分辨能力 ,冰川雷达测厚的误差小于 1 .2 %。研究结果显示 ,1号冰川东支冰川平均厚度为 5 8.77m ,西支冰川平均厚度为 44.84m ,冰体厚度最大值发育于冰川中部趋于主流线位置。冰川冰储量计算表明 ,东支冰储量为 0 .0 5 1 868km3,西支冰储量为 0 .0 2 0 2 1 0km3。表面和底部地形有明显差异 ,主要因冰川动力过程对基岩强烈的地貌作用所致 ,意味着冰床的起伏地形对冰川浅层冰体的运动过程影响不显著。  相似文献   

地中蒸渗计水分运移机理及其监测误差分析   总被引：1，自引：0，他引：1  

李金柱  杨晓俊  杜琦 《水文》2003,23(5):10-12,37

对地中蒸渗计与自然潜水水分运移机理存在的差异及误差进行了分析。结果表明：地中蒸渗计与自然潜水在水位动态、水分存储、水分运移等方面存在一定的差异，使得利用地中蒸渗计监测的潜水蒸发量、降雨入渗补给量与自然潜水的实际情况产生了一定的误差，这种误差随着潜水埋深的变化而变化，潜水埋深越浅，误差越大，潜水埋深越深，误差越小。特别对于潜水埋深小于1．5m的地中蒸渗计，使用其资料时一定要作适当的技术处理，如果直接引用，将会给计算成果带来较大的误差。  相似文献