生活垃圾卫生填埋地质环境(LFGE)效应的系统分析方法研究——以上海浦东新区为例     

陈岳 《地质灾害与环境保护》1999,(Z1)

在系统分析总结国内外本领域的研究发展现状的基础上,以上海浦东新区城市生活垃圾卫生填埋处理为研究背景,首次提出ＬＦＧＥ效应系统分析方法的完整理论和应用体系,体系主要包括：ＬＦＧＥ效应的主控因素特征分析;在垃圾淋滤试验、有关土的工程性能试验和反映运移转化特征的土柱试验基础上的作用机制研究;具单元、组合、整体模拟及压实效应模拟功能的模拟计算研究;在不确定性条件存在下,随机模拟研究和以贝叶斯决策分析理论为基础的ＬＦＧＥ效应决策分析技术经济转换研究  相似文献   

Bayes判别分析法与地震短临预测   总被引：5，自引：0，他引：5  

王晓青  石绍先  丁香 《地震》1999,19(1):33-40

建立了一套完整的Bayes判别分析方法,并提出了明确的衡量综合预测结果所冒风险大小的风险代价比Kdn该方法可用于不同时间尺度的地震综合预测。选取云南地区1994～1996年的水氡观测资料,采用X2统计检验法识别前兆异常,利用Bayes判别分析方法对云南地区的强震活动性进行了内符检验和外推预测。在风险代价比Kdn取4的情况下,内符检验的R值可达0．54,外推时空占有率0．07,获得了满意的效果。  相似文献   

DÉTERMINATION DU DÉBIT DES PUITS INCOMPLETS DE NAPPES LIBRES FONCÉS EN TERRAIN ISOTROPE ET ANISOTROPE     

D. LE GOURIÉRÈS 《水文科学杂志》2013,58(3):301-313

ABSTRACT

In this paper, the author relies on Darcy's law and on an hypothesis formulated from experimental considerations to establish a semi-empirical formula for the calculation of the discharge of partially penetrating wells of free aquifer sunk in isotropic soils.

This relatively simple relation applied to 27 cases studied under an experimental design or numerical computations, reveals itself to have an unexpected accuracy.

Starting from previous formula, the author establishes another one for partially penetrating wells bored in anisotropic soils.  相似文献   

A new Likelihood Ratio for supervised classification of fully polarimetric SAR data: An application for sea ice type mapping     

《ISPRS Journal of Photogrammetry and Remote Sensing》2013

One of the potential applications of polarimetric Synthetic Aperture Radar (SAR) data is the classification of land cover, such as forest canopies, vegetation, sea ice types, and urban areas. In contrast to single or dual polarized SAR systems, full polarimetric SAR systems provide more information about the physical and geometrical properties of the imaged area. This paper proposes a new Bayes risk function which can be minimized to obtain a Likelihood Ratio (LR) for the supervised classification of polarimetric SAR data. The derived Bayes risk function is based on the complex Wishart distribution. Furthermore, a new spatial criterion is incorporated with the LR classification process to produce more homogeneous classes. The application for Arctic sea ice mapping shows that the LR and the proposed spatial criterion are able to provide promising classification results. Comparison with classification results based on the Wishart classifier, the Wishart Likelihood Ratio Test Statistic (WLRTS) proposed by Conradsen et al. (2003) and the Expectation Maximization with Probabilistic Label Relaxation (EMPLR) algorithm are presented. High overall classification accuracy of selected study areas which reaches 97.8% using the LR is obtained. Combining the derived spatial criterion with the LR can improve the overall classification accuracy to reach 99.9%. In this study, fully polarimetric C-band RADARSAT-2 data collected over Franklin Bay, Canadian Arctic, is used.  相似文献   

结合非线性贝叶斯反演算法的油田储层参数反演     

张旭东  符华年  杨崇 《测绘通报》2019,(12):137-141

基于地球物理反演算法，利用地表沉降信息快速获取油田储层状态信息，对于油田储层安全的实时监控具有重要意义。目前国内外对油田储层参数反演的研究相对较少，因此本文以典型的因石油开采引起地表沉降的辽河盘锦地区作为研究区域，以InSAR沉降监测结果作为观测数据，以Okada模型作为反演模型，首次将非线性贝叶斯反演算法引入到油田储层参数反演中。在试验过程中，发现油田地下存在不止一个油层，首次将双Okada模型引入到油田储层参数反演中。试验表明：①非线性贝叶斯反演算法不仅能够获取模型参数的最优值，同时可以对反演结果的不确定性做出解释。②与单源Okada模型相比，双Okada模型更符合该地区油田储层参数变化与地表沉降之间的映射关系，基于双Okada模型反演得到的油田储层参数更可靠。  相似文献   

Modern geostatistics: computational BME analysis in the light of uncertain physical knowledge – the Equus Beds study     

M. L. Serre  G. Christakos 《Stochastic Environmental Research and Risk Assessment (SERRA)》1999,13(1-2):1-26

This paper is concerned with a computational formulation of the Bayesian maximum entropy (BME) mapping method, which can handle rigorously and efficiently spatiotemporal applications of considerable practical importance. BME is a method of modern geostatistics that can integrate and process physical knowledge that belongs to two major bases: general knowledge (i.e., obtained from general principles and laws, summary statistics and background information), and specificatory knowledge (i.e., obtained through experience with the specific situation). BME allows considerable flexibility regarding the choice of an appropriate spatiotemporal map, offers a complete assessment of the mapping uncertainty and contributes to the scientific understanding of the underlying natural phenomenon. Valuable insight is gained by studying a spatiotemporal data set representing water-level elevations at the Equus Beds aquifer (Kansas). Numerical results show that, as was expected in theory, classical geostatistics analysis is obtained as a special case of the considerably more general BME approach. Moreover, modern geostatistical analysis in terms of BME offers more accurate and informative results in practice, by incorporating various sources of physical knowledge that cannot be processed by the classical methods.  相似文献   

矿井突水水源的Bayes逐步判别分析研究     

关维娟  许光泉  陈明强  许峰 《地下水》2014,(1):40-42,47

对Bayes逐步判别法在矿井突水水源判别中的应用进行研究分析。选用六大常规离子（ Ca2＋、Mg2＋、K＋＋Na＋、SO42-、Cl-、HCO3-）作为判别因子,建立Bayes逐步判别分析模型,以内蒙唐家汇矿区突水水源判别为例,在建立的判别模型回判检验准确率仅60%,分析原因可能与选定的特征判别因子对该矿区水样分类影响能力较弱有关。增加总硬度、碱度、PH值和矿化度作为判别因子,重新建立Bayes判别分析模型,使回判准确率提高至90%,证明适当增加特征判别因子对改善Bayes逐步判别模型的可靠性和稳定性有利。经对唐家会矿区的3个未知样本进行了判别分析,并与距离判别法和模糊综合评判法判别结果对比,结果表明Bayes逐步判别模型准确性较好,判别准确率与距离判别结果完全相同,而优于模糊综合评判方法。在合理选取特征判别因子的情况下,Bayes逐步判别法是目前矿井突水水源判别的有效方法。  相似文献   

利用Bayes估计进行多波束测深异常数据探测   总被引：1，自引：1，他引：0  

黄贤源  隋立芬  翟国君  柴洪洲 《武汉大学学报(信息科学版)》2010,(2)

在海底地形变化连续、平缓的假设条件下,基于Bayes估计理论提出了多波束测深异常数据探测方法,并与选权迭代加权平均滤波法进行了分析和比较。结果证明,该方法可以解决测深异常值判断标准可靠性的问题,而且能合理、有效地探测出异常值。  相似文献   

利用Bayes判别分析进行矢量地图修改检测     

郭建忠  谢明霞  陈科 《测绘工程》2014,(1):1-4

针对现有的矢量地图修改检测方法计算速度慢、效率低等问题,设计利用Bayes判别分析进行地图修改检测的方法。首先对同一幅修改前后的矢量地图分别进行栅格化,并进行配准;然后利用Bayes判别分析方法对配准后的栅格图像进行变化检测,获得矢量地图的修改区域;最后将修改区域与审校结果进行对比,发现错修改和漏修改问题。实际矢量地图数据的修改检测实验结果验证了利用Bayes判别分析方法实现地图修改检测的有效性和可行性。  相似文献   

岩质边坡楔形体稳定模糊随机可靠性研究   总被引：1，自引：0，他引：1  

王宇  魏献忠  黎明  余宏明 《地质科技情报》2012,(4):111-116

在统计矩点估计法和模糊随机理论的基础上,提出了楔形体模糊随机可靠性分析改进的模糊点估计法,将楔形体稳定极限状态方程由模糊随机集向普通随机集转化,首先采用Bayes推断方法求解小样本条件下结构面力学参数的概率分布函数,用正态模糊数对随机变量进行模糊随机化处理,然后利用模糊点估计法求解楔形体的可靠度指标。算例分析结果表明,该法使用简便,结果可靠,更能客观地反映楔形体的真实状态,从而为工程决策提供依据。  相似文献