Vertical Hydraulic Gradient Estimation in Clay Till, Using <scp>MiHPT</scp> Advanced Direct‐Push Technology

Rosenberg, Louise; Broholm, Mette Martina; Tuxen, Nina; Kerrn-Jespersen, Ida Henriette; Lilbæk, Gro; Bjerg, Poul Løgstrup

doi:10.1111/gwmr.12470

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…In this study, we use the available data within the local investigation area set in the source zone (NIRAS 2019; Rosenberg et al 2022) to make a more detailed local geological model (Figure 1, top). Specific borehole logs and grain size analyses associated with boreholes B301, B302, and B303 were included in this study, while relative permeability data were obtained from MiHPT14, MiHPT15, and MiHPT16.…”

Section: Methodsmentioning

confidence: 99%

“…The relative permeability data were collected using the Membrane Interface and Hydraulic Profiling Tool (MiHPT), but only the HPT data will be used in this study as a measure for the relative permeability of the subsurface (McCall et al 2014; McCall and Christy 2020). Further details can be found in Data S1 and Rosenberg et al (2022).…”

Section: Methodsmentioning

confidence: 99%

“…The field site has previously been thoroughly investigated in order to understand the spreading of an identified TCE contamination from the source zone in the clayey till to the underlying sand aquifer and to estimate the contaminant mass discharge (NIRAS 2019;Rosenberg et al 2022Rosenberg et al , 2023. The GPR investigation in this study took place in the suspected source zone area in the clayey till.…”

Section: Field Site-contamination and Geological Settingmentioning

confidence: 99%

“…The GPR investigation in this study took place in the suspected source zone area in the clayey till. Further details of the site and contamination can be found in Rosenberg et al (2022Rosenberg et al ( , 2023.…”

Section: Field Site-contamination and Geological Settingmentioning

confidence: 99%

See 3 more Smart Citations

High‐Resolution Geological Information from Crosshole Ground Penetrating Radar in Clayey Tills

Jensen¹,

Rosenberg²,

Tsitonaki³

et al. 2023

Groundwater Monitoring Rem

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Heterogeneous glacial deposits dominate large parts of the Northern Hemisphere. In these landscapes, high‐resolution characterization of the geology is crucial for understanding contaminant transport. Geological information is mostly obtained from multiple boreholes drilled during a site investigation, but such point‐based data alone do not always provide the required resolution to map small‐scale heterogeneity between boreholes. Crosshole ground penetrating radar (GPR) is suggested as a tool for adding credible geological information between boreholes at contaminated site investigations in industrial sites where infrastructure, such as electrical installations, can pose a challenge to other geophysical methods. GPR data are sensitive to the dielectric permittivity and the bulk electrical conductivity, which can be related to the distribution of water content and sand/clay occurrences. Here we present a detailed crosshole GPR dataset collected at an industrial contaminated site in a clay till setting. The data are processed using a novel inversion approach where information on changes in the velocity and attenuation of the radar signal are obtained independently. The GPR results are compared to borehole logs, grain size analyses, and relative permeability data from the site. The GPR data analysis provided valuable information on the understanding of the lateral geological variability. A silt layer with a thickness of a few decimeters, likely important for flow characterization, was confirmed and resolved by GPR data. Our findings suggest that crosshole GPR has the potential for contributing with high‐resolution geological information by filling the data gap between boreholes, thereby becoming a relevant tool in contaminated site investigations.

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Section: Methodsmentioning

confidence: 99%