地质统计学法在地下水污染溯源中的应用及参数敏感性分析

发布时间：2018-12-12 13:31

【摘要】：为了确定地下水污染物来源,将地质统计学方法应用于追溯一维均质含水层中污染源的排放过程,利用数值实验分析了观测点布设位置、污染物浓度观测误差、水动力弥散参数和地下水流速对地质统计学法溯源效果的影响。结果表明,观测点提供的浓度信息能准确反映观测时刻污染物浓度的分布时,根据这些浓度信息可得到好的溯源效果。反演出的污染物排放过程与真实排放过程相似度较高时,污染物浓度测量误差的数量级介于10-6~10-3.5之间,水动力弥散系数的变化幅度在-10%~5%内,实际平均流速的变化幅度在±2%间。在本次数值实验条件下,地质统计学法给出了较好的溯源效果,与观测浓度误差相比,水动力弥散参数和地下水流速对溯源效果影响更显著。
[Abstract]:In order to determine the source of groundwater pollutants, geostatistical method is applied to trace the discharge process of pollution sources in one-dimensional homogeneous aquifer. The location of observation points and the observation error of pollutant concentration are analyzed by numerical experiments. Effects of hydrodynamic dispersion parameters and groundwater velocity on traceability of geostatistics. The results show that the concentration information provided by the observation point can accurately reflect the distribution of pollutant concentration at the observation time, according to which good traceability can be obtained. When the similarity between the reverse emission process and the real emission process is high, the order of magnitude of the measurement error of pollutant concentration is between 10-6 and 10-3.5, and the variation of hydrodynamic dispersion coefficient is within -1010 ~ 5%. The range of actual mean velocity is 卤2%. Under the condition of this numerical experiment, the geostatistics method gives a better traceability effect. Compared with the error of observed concentration, hydrodynamic dispersion parameters and groundwater velocity have more significant influence on the traceability effect.
【作者单位】：南京水利科学研究院;水文水资源与水利工程科学国家重点实验室;南京瑞迪建设科技有限公司;
【基金】：国家自然科学基金项目(51409161,51509157) 江苏省自然科学基金项目(BK20140080) 水利部技术示范项目(SF-201706)
【分类号】：X523

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