Subsurface imaging using a combination of magnetic, ERT, TEM, and CSRMT data at the Weidenpesch waste site in Cologne

结合使用磁力、ERT、TEM 和 CSRMT 数据在科隆 Weidenpesch 废物场进行地下成像

• 批准号: 528467239
• 负责人: Professor Dr. Bülent Tezkan
• 金额: --
• 依托单位: Arbeitsgruppe Angewandte Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/528467239?language=en
• 关键词: Subsurface; imaging; using; combination; magnetic

Geophysical characterization of landfills represents an important procedure in site remediation. Nowadays, the use of non-destructive and non-invasive geophysical techniques directed toward detecting the waste body and imaging contamination plumes, has been clearly increased. In the Weidenpesch waste site, northwest of Cologne/Germany, magnetic, ERT, TEM, and CSRMT data were measured in the frame of the DFG project TE 170/21-1. The measurements were delayed for several months (c. 9 months) because of the travel restrictions during the covid-19 epidemic and the decision of changing the investigated landfill chosen in the original plan located in Russia. This influenced the achievement of the planned goals within the allotted time. By the integrated interpretation of magnetic, ERT, and TEM data we were able to successfully determine the geometry of the waste body of the Weidenpesch landfill. Additionally, dumped magnetic and non-magnetic materials were obviously distinguished. The different techniques used for determining the waste site's horizontal boundaries showed a good degree of consistency. The findings demonstrate that, in contrast to the highly resistive hosting gravelly sand layer, the dumped materials have low resistivity values making it easier to image the waste body. An interesting, very conductive layer (less than 5 Ω.m) has been found at deep depths using ERT and TEM data. This layer was interpreted as a wet brown lignite layer based on the available borehole and geological information. It is detected at a depth up of 20-25 m and its base wasn’t detected by the used techniques. The resistivity of this layer could not be resolved. The current proposed project (duration 6 months) will focus on detecting the base of the coal layer using larger loops than the used ones; eight TEM stations with loops of 50m × 50m or even 80m × 80m inside and outside the landfill are planned. Moreover, 2D/3D modelling of TEM data will be carried, and the TEM data obtained from large-loop stations will be integrated in the modelling study. Furthermore, constraints from ERT, magnetic and CSRMT will be utilized. The finite element algorithm CustTEM and the well-known finite difference algorithm SLDMem3t will be applied. Finally, combining the findings from the different used geophysical techniques will aid in improving the imaging of the waste body and, more precisely, in tracing any potential contaminant plumes. Thus, this strategy will be quite useful in risk assessment and constructing the final model of the landfill.

垃圾填埋场的地球物理表征在现场修复中检测到的地球物理技术总监，垃圾污染物和成像污染物显然已经增加了。在俄罗斯的原始计划中选择了在俄罗斯的原始计划中选择的旅行限制和更改所调查的限制。成功地确定了魏登普斯垃圾填埋场的几何形状。倾倒材料具有低电阻率值，使其易于使用，将其引导层（小于5Ω.m）在深度上使用EERT EERT和TEM数据被解释为湿的棕色木质石。基于可用的钻孔和地质信息。使用器循环比用过的八个TEM站的层，该电路台的循环范围为50m×50m，甚至80m×80m，在垃圾填埋场内和外部填充了TEM数据的2D/3D模型。电台将集成在模型中。因此，在追踪任何潜在的容器时，因此，此策略将在风险评估和构建垃圾填埋场的最终模型中非常有用。