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等效流体体积模量稳定反演方法 被引量:3
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作者 刘晓晶 印兴耀 +1 位作者 宗兆云 崔维 《石油地球物理勘探》 EI CSCD 北大核心 2016年第6期1164-1170,1051,共7页
基于等效流体体积模量的反射系数近似方程,并结合Connolly弹性阻抗思想,推导了基于等效流体体积模量的弹性阻抗方程,并对弹性阻抗方程进行了归一化处理。在反演等效流体体积模量过程中,发现待反演参数的系数之间存在系数相关性,严重影... 基于等效流体体积模量的反射系数近似方程,并结合Connolly弹性阻抗思想,推导了基于等效流体体积模量的弹性阻抗方程,并对弹性阻抗方程进行了归一化处理。在反演等效流体体积模量过程中,发现待反演参数的系数之间存在系数相关性,严重影响了等效流体体积模量反演的稳定性。首先采用贝叶斯框架下的弹性阻抗反演方法,进而将孔隙度反演结果作为已知信息加入到等效流体体积模量反演方程中,使待反演参数系数矩阵满秩,结合弹性阻抗反演结果,实现了等效流体体积模量的稳定反演。该方法有效地去除了系数之间的相关性,并将待反演参数减少为3个,所需要的角度个数也由4个减少为3个,提高了等效流体体积模量反演的稳定性。模型实验结果与实际数据应用均验证了方法的有效性。 展开更多
关键词 等效流体体积模量 弹性阻抗 稳定反演 孔隙度反演
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自适应迭代求冲激响应法解决散射场反演稳定性问题 被引量:5
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作者 林俊轩 《声学学报》 EI CSCD 北大核心 1997年第3期193-197,共5页
解决反演运算稳定性必须在运算前对信号进行预处理.本文提出时域自适应迭代求层系冲激响应的处理方法,有效地减小由于预处理引起的误差.反演模拟结果与取样实测结果相当符合.
关键词 散射场 海洋声 声散射 反演稳定 自适应迭代
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Magnetotelluric extremum boundary inversion based on different stabilizers and its application in a high radioactive waste repository site selection 被引量:3
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作者 Huang Xian-Yang Deng Ju-Zhi +3 位作者 Chen Xiao Wang Xian-Xiang Chen Hui Yu Hui 《Applied Geophysics》 SCIE CSCD 2019年第3期367-377,397,398,共13页
Geophysical inversion under different stabilizers has different descriptions of the target body boundary,especially in complex geological structures.In this paper,we present an extremum boundary inversion algorithm ba... Geophysical inversion under different stabilizers has different descriptions of the target body boundary,especially in complex geological structures.In this paper,we present an extremum boundary inversion algorithm based on different stabilizers for electrical interface recognition.Firstly,we use the smoothest and minimum-support stabilizing functional to study the applicability of adaptive regularization inversion algorithm.Then,an electrical interface recognition method based on different stabilizers is developed by introducing extremum boundary inversion algorithm.The testing shows that the adaptive regularization inversion method does work for different stabilizers and has a low dependence on the initial models.The ratio of the smooth and focusing upper and lower boundaries obtained using the extremum boundary inversion algorithm can clearly demarcate electrical interfaces.We apply the inversion algorithm to the magnetotelluric(MT)data collected from a preselected area of a high-level-waste clay-rock repository site in the Tamusu area.We recognized regional structures with smooth inversion and the local details with focusing inversion and determined the thickness of the target layer combined with the geological and drilling information,which meets the requirement for the site of the high-level waste clay-rock repository. 展开更多
关键词 MAGNETOTELLURIC adaptive regularization inversion STABILIZER extremum boundary inversion high-level waste repository Tamusu
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航空瞬变电磁数据光滑拟二维反演 被引量:3
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作者 路俊涛 雷达 +1 位作者 任浩 杨良勇 《地球物理学进展》 CSCD 北大核心 2021年第4期1573-1580,共8页
航空瞬变电磁法适用于浅表地层的大面积探测,由于实测数据量巨大,一维反演作为一种快速高效的方法被广泛应用.在层状地电条件下,横向约束反演能有效的改善传统单点阻尼最小二乘反演结果中界面横向不连续的情况,但其存在反演过程依赖初... 航空瞬变电磁法适用于浅表地层的大面积探测,由于实测数据量巨大,一维反演作为一种快速高效的方法被广泛应用.在层状地电条件下,横向约束反演能有效的改善传统单点阻尼最小二乘反演结果中界面横向不连续的情况,但其存在反演过程依赖初始模型,且在复杂层状情况下迭代不稳定的问题.本文提出一种基于OCCAM反演并在正则化项中引入横向光滑约束的光滑拟二维反演方法,在保持OCCAM方法对初始模型依赖性小优势的同时,也使得相邻测点电性横向连续.在反演过程中采用令满足迭代误差的测点不再参与后续迭代的策略,以此减少不必要的正演和雅可比计算,提高反演效率.通过对三个不同地电情况的理论模拟数据进行光滑拟二维反演,并与其他传统反演方法对比,验证了该方法能有效的提高反演稳定性,得到与理论模型高度吻合的反演结果. 展开更多
关键词 航空瞬变电磁 拟二维反演 横向光滑 反演稳定
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小坑山滑坡成因分析及稳定分析研究
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作者 金建鸿 白亮 《公路交通科技(应用技术版)》 CAS CSCD 2014年第6期71-75,共5页
本文以小坑山滑坡体为工程背景,对滑坡体进行成因分析。根据滑坡宏观变形状况假设滑坡稳定系数,用剩余推力法建立滑坡反演分析的平衡方程,反算出滑带土的抗剪强度参数,进而实现滑坡稳定性分析与评价。
关键词 滑坡 成因分析 反演稳定分析
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Meteorological conditions for the persistent severe fog and haze event over eastern China in January 2013 被引量:117
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作者 ZHANG RenHe LI Qiang ZHANG RuoNan 《Science China Earth Sciences》 SCIE EI CAS 2014年第1期26-35,共10页
In January 2013,a severe fog and haze event(FHE)of strong intensity,long duration,and extensive coverage occurred in eastern China.The present study investigates meteorological conditions for this FHE by diagnosing bo... In January 2013,a severe fog and haze event(FHE)of strong intensity,long duration,and extensive coverage occurred in eastern China.The present study investigates meteorological conditions for this FHE by diagnosing both its atmospheric background fields and daily evolution in January 2013.The results show that a weak East Asian winter monsoon existed in January2013.Over eastern China,the anomalous southerly winds in the middle and lower troposphere are favorable for more water vapor transported to eastern China.An anomalous high at 500 hPa suppresses convection.The weakened surface winds are favorable for the fog and haze concentrating in eastern China.The reduction of the vertical shear of horizontal winds weakens the synoptic disturbances and vertical mixing of atmosphere.The anomalous inversion in near-surface increases the stability of surface air.All these meteorological background fields in January 2013 were conducive to the maintenance and development of fog and haze over eastern China.The diagnosis of the daily evolution of the FHE shows that the surface wind velocity and the vertical shear of horizontal winds in the middle and lower troposphere can exert dynamic effects on fog and haze.The larger(smaller)they are,the weaker(stronger)the fog and haze are.The thermodynamic effects include stratification instability in middle and lower troposphere and the inversion and dew-point deficit in near-surface.The larger(smaller)the stratification instability and the inversion are,the stronger(weaker)the fog and haze are.Meanwhile,the smaller(larger)the dewpoint deficit is,the stronger(weaker)the fog and haze are.Based on the meteorological factors,a multi-variate linear regression model is set up.The model results show that the dynamic and thermodynamic effects on the variance of the fog and haze evolution are almost the same.The contribution of the meteorological factors to the variance of the daily fog and haze evolution reaches 0.68,which explains more than 2/3 of the variance. 展开更多
关键词 fog and haze event meteorological conditions eastern China January 2013
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