Using Geophysical Methods to Differentiate Between Till and Glacial Rhythmite Sediment at Wildwood Metropark, Toledo, Ohio

Okoko, George; Emmanuel, Efemena D.; Adebayo, Moses B.; Casaus, Maureen; Ogunkoya, Akinwale; Otchere, E.; Ogundeji, Seyi E.; Doro, Kennedy O.; Fisher, Timothy G.

doi:10.1130/abs/2022nc-374964

Cited by 2 publications

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“…To assess the application of the conceptual model developed for the STAR site at other locations within the OOR, the results of this study were compared with geophysical results at the WWPM (Okoko et al, 2022) and SHC (Becker et al, 2021) as well as the sur cial geology mapping of the region by Larsen et al (2005). A 2-D geologic cross-section extending from the STAR site through WWPM to SHC was created using the sur cial geology map with subsurface geological details from well-logs (Larsen et al, 2005).…”

Section: Comparing Results At Star With Other Sites In the Oormentioning

confidence: 99%

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

Ogunkoya,

Martin-Hayden,

Fisher

et al. 2023

Environ Earth Sci

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In this study, geophysical and geologic data were combined to develop a 3D conceptual hydrogeological model of a section of the Oak Openings Region (OOR) in northwest Ohio with a globally rare ecosystem of oak savanna and grassland prairie. The presence of a rhythmically laminated silt and clay unit underlying the study area is now widely realized. Assessing the in uence of this unit on the interaction between shallow uncon ned, sandy, and con ned carbonate bedrock aquifers requires an appropriate groundwater model. A rst step to this is to update the current conceptual hydrogeological model of the region, which either neglects the rhythmites or combines it with the till as a single hydrogeological unit. To do this, twenty electrical resistivity soundings and eleven 166 m long 2D transects of electrical resistivity data were combined with refraction seismic data acquired along a 96 m long transect. The geophysics results were validated with lithological data from a public database and two wells drilled during the study. A digital elevation model and stratigraphic layers extracted from the geophysics result were used to create a 3D site model. The model shows four layers consisting of a carbonate bedrock aquifer, con ning till layer, rhythmically laminated silt and clay, and a sandy aquifer in a bottom-up sequence. The rhythmites consist of horizontal laminae that are more permeable than the underlying till. Combining geophysics with geologic data distinguished the till from rhythmites and de nes the hydrostratigraphic layers used to re ne the aquifer conceptual model across sections of the OOR.

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Section: Comparing Results At Star With Other Sites In the Oormentioning

confidence: 99%

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

Ogunkoya,

Martin-Hayden,

Fisher

et al. 2023

Environ Earth Sci

View full text Add to dashboard Cite

show abstract

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

Ogunkoya

Martin-Hayden

Fisher

et al. 2023

Preprint

View full text Add to dashboard Cite

In this study, geophysical and geologic data were combined to develop a 3D conceptual hydrogeological model of a section of the Oak Openings Region (OOR) in northwest Ohio with a globally rare ecosystem of oak savanna and grassland prairie. The presence of a rhythmically laminated silt and clay unit underlying the study area is now widely realized. Assessing the influence of this unit on the interaction between shallow unconfined, sandy, and confined carbonate bedrock aquifers requires an appropriate groundwater model. A first step to this is to update the current conceptual hydrogeological model of the region, which either neglects the rhythmites or combines it with the till as a single hydrogeological unit. To do this, twenty electrical resistivity soundings and eleven 166 m long 2D transects of electrical resistivity data were combined with refraction seismic data acquired along a 96 m long transect. The geophysics results were validated with lithological data from a public database and two wells drilled during the study. A digital elevation model and stratigraphic layers extracted from the geophysics result were used to create a 3D site model. The model shows four layers consisting of a carbonate bedrock aquifer, confining till layer, rhythmically laminated silt and clay, and a sandy aquifer in a bottom-up sequence. The rhythmites consist of horizontal laminae that are more permeable than the underlying till. Combining geophysics with geologic data distinguished the till from rhythmites and defines the hydrostratigraphic layers used to refine the aquifer conceptual model across sections of the OOR.

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Using Geophysical Methods to Differentiate Between Till and Glacial Rhythmite Sediment at Wildwood Metropark, Toledo, Ohio

Cited by 2 publications

References 0 publications

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

Combining geophysical and geological datasets to improve a conceptual aquifer model of the Oak Openings Region in northwest Ohio, USA

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