污染场地调查动态追补钻井点位的方法研究

发布时间：2018-03-15 10:33

本文选题：补充采样　切入点：克里格　出处：《环境科学学报》2017年04期 　论文类型：期刊论文

【摘要】：污染场地中的污染区域较小,但污染物的空间变异性大,污染土体较深,因而在场地调查中通常需采集场地钻井数据进行三维模拟.为了准确估计场地土壤污染物的空间分布和需修复的污染土方量,提出了场地污染调查补充采样钻井点位布设的优化方法.在初始采样的基础上,首先利用克里格方法预测场地中土壤污染物的克里格方差,基于克里格方差估算置信度,再结合场地置信度和场地污染物含量的空间分布确定场地的最大不确定性点,并将该点作为下一阶段补充采样点,以实现逼近式动态追补钻井点位的布设.最后,以某硝基苯污染的工业场地为例对该方法进行验证.结果表明:场地中硝基苯的空间变异性大,增加采样点会显著减少基台值,提高研究区总体的置信度,同时减少总体的不确定性.在项目经费约束条件下,不确定性减少65%时,需要至少增加采样点10个.10个样点的增加使得总体估值方差降低了40%,同时总体的估计精度提高了22.4%.案例结果验证了该方法在单一类有机污染场地中的可行性和适用性,能够在保证场地污染调查精度的同时,显著降低样本量,实现场地调查的成本-效益最大化.
[Abstract]:The polluted area in the polluted site is small, but the spatial variability of the pollutant is large, and the polluted soil is deeper. Therefore, in order to accurately estimate the spatial distribution of soil pollutants and the amount of contaminated earthwork to be repaired, it is usually necessary to collect site drilling data for three-dimensional simulation in site investigation. Based on the initial sampling, the Kriging method is used to predict the Kriging variance of soil pollutants in the site, and the confidence degree is estimated based on the Kriging variance. The maximum uncertainty point of the site is determined by combining the spatial distribution of the confidence degree of the site and the content of pollutants in the site, and this point is used as the next stage to supplement the sampling point in order to realize the location of the drilling point dynamically and approximatively. Finally, the maximum uncertainty point of the site is determined. The results show that the spatial variability of nitrobenzene in the site is large, and the increase of sampling point will significantly reduce the base value and increase the overall confidence of the study area. At the same time reduce the overall uncertainty. In the project funding constraints, uncertainty is reduced by 65%, At least 10 additional sampling sites are required. The increase of 10 samples reduces the overall variance of estimates by 40 and improves the overall estimation accuracy by 22.4. The case results verify the feasibility and applicability of the method in a single class of organic pollution sites. At the same time, the accuracy of site pollution investigation can be guaranteed, and the sample size can be significantly reduced, and the cost and benefit of site investigation can be maximized.
【作者单位】：北京农业信息技术研究中心;中国科学院地理科学与资源研究所;
【基金】：国家自然科学基金项目(No.41271339) 北京市科技计划项目(No.D16110900470000) 中国科学院重点部署项目(No.ZDRW-ZS-2016-5-5) 国家重点研发计划(No.2016YFD0800906-1)~~
【分类号】：X53

【相似文献】