Frederick D. Day-Lewis (Former Employee)
Science and Products
Filter Total Items: 13
Example data from MoisturEC: a new R program for moisture content estimation from electrical conductivity data Example data from MoisturEC: a new R program for moisture content estimation from electrical conductivity data
This dataset includes example data used for demonstration of the moisturEC program. This includes inverted electrical resistivity data, model resolution from the inversion, point moisture information, and conductivity-saturation calibration information. The data are from a field site in Coventry, CT outfitted with five, Decagon 5TE moisture probes, arranged along a 28 m transect at...
Filter Total Items: 94
Evaluation of riverbed magnetic susceptibility for mapping biogeochemical hot spots in groundwater-impacted rivers Evaluation of riverbed magnetic susceptibility for mapping biogeochemical hot spots in groundwater-impacted rivers
Redox hot spots occurring as metal-rich anoxic groundwater discharges through oxic wetland and river sediments commonly result in the formation of iron (Fe) oxide precipitates. These redox-sensitive precipitates influence the release of nutrients and metals to surface water and can act as ‘contaminant sponges’ by absorbing toxic compounds. We explore the feasibility of a non-invasive...
Authors
Cheng-Hui Wang, Martin A. Briggs, Frederick Day-Lewis, L. Slater
Beware of spatial autocorrelation when applying machine learning algorithms to borehole geophysical logs Beware of spatial autocorrelation when applying machine learning algorithms to borehole geophysical logs
Although many of the algorithms now considered to be machine learning algorithms (MLAs) have existed for nearly a century (e.g., Rosenblatt 1958), interest in MLAs has recently increased exponentially for solving data-driven problems across a variety of fields due to the expanded availability of large, complex datasets that may be difficult to interrogate using other methods, increases...
Authors
Neil Terry, Carole D. Johnson, Frederick Day-Lewis, Beth L. Parker, Lee D. Slater
Characterizing physical properties of streambed interface sediments using in situ complex electrical conductivity measurements Characterizing physical properties of streambed interface sediments using in situ complex electrical conductivity measurements
Streambed sediment physical properties such as surface area, are difficult to quantify in situ but exert a high‐level control on a wide range of biogeochemical processes and sorption of contaminants. We introduce the use of complex electrical conductivity (CC) methods (also known as spectral induced polarization (SIP)) that measure both real and imaginary conductivity to non‐invasively...
Authors
Cheng-Hui Wang, Martin A. Briggs, Frederick Day-Lewis, L. Slater
Experimental shifts of hydrologic residence time in a sandy urban stream sediment-water interface alter nitrate removal and nitrous oxide fluxes Experimental shifts of hydrologic residence time in a sandy urban stream sediment-water interface alter nitrate removal and nitrous oxide fluxes
The sediment–water interfaces (SWI) of streams serve as important biogeochemical hotspots in watersheds and contribute to whole-catchment reactive nitrogen budgets and water-quality conditions. Recently, the SWI has been identified as an important source of nitrous oxide (N2O) produced in streams, with SWI residence time among the principal controls on its production. Here, we conducted...
Authors
T. Hampton, J. Zarnetske, Martin A. Briggs, F. M. P. Dehkordy, K. Singha, Frederick Day-Lewis, Judson Harvey, S. R. Chowdhury, John W. Lane
Formation criteria for hyporheic anoxic microzones: Assessing interactions of hydraulics, nutrients and biofilms Formation criteria for hyporheic anoxic microzones: Assessing interactions of hydraulics, nutrients and biofilms
Recent experimental studies have detected the presence of anoxic microzones in hyporheic sediments. These microzones are small‐scale anoxic pores, embedded within oxygen‐rich porous media and can act as anaerobic reaction sites producing reduction compounds such as nitrous oxide, a potent greenhouse gas. Microbes are a key control on nutrient transformation in hyporheic sediment, but...
Authors
S. R. Chowdhury, J. Zarnetske, M.S. Phanikumar, Martin A. Briggs, Frederick D. Day-Lewis, K. Singha
Geophysical mapping of plume discharge to surface water at a crude oil spill site: Inversion versus machine learning Geophysical mapping of plume discharge to surface water at a crude oil spill site: Inversion versus machine learning
The interpretation of geophysical survey results to answer hydrologic, engineering, and geologic questions is critical to diverse problems for management of water, energy, and mineral resources. Although geophysical images provide valuable qualitative insight into subsurface architecture and conditions, translating geophysical images into quantitative information (e.g., saturation...
Authors
Neil Terry, Frederick D. Day-Lewis, John W. Lane, Jared J. Trost, Barbara A. Bekins
Science and Products
Filter Total Items: 13
Example data from MoisturEC: a new R program for moisture content estimation from electrical conductivity data Example data from MoisturEC: a new R program for moisture content estimation from electrical conductivity data
This dataset includes example data used for demonstration of the moisturEC program. This includes inverted electrical resistivity data, model resolution from the inversion, point moisture information, and conductivity-saturation calibration information. The data are from a field site in Coventry, CT outfitted with five, Decagon 5TE moisture probes, arranged along a 28 m transect at...
Filter Total Items: 94
Evaluation of riverbed magnetic susceptibility for mapping biogeochemical hot spots in groundwater-impacted rivers Evaluation of riverbed magnetic susceptibility for mapping biogeochemical hot spots in groundwater-impacted rivers
Redox hot spots occurring as metal-rich anoxic groundwater discharges through oxic wetland and river sediments commonly result in the formation of iron (Fe) oxide precipitates. These redox-sensitive precipitates influence the release of nutrients and metals to surface water and can act as ‘contaminant sponges’ by absorbing toxic compounds. We explore the feasibility of a non-invasive...
Authors
Cheng-Hui Wang, Martin A. Briggs, Frederick Day-Lewis, L. Slater
Beware of spatial autocorrelation when applying machine learning algorithms to borehole geophysical logs Beware of spatial autocorrelation when applying machine learning algorithms to borehole geophysical logs
Although many of the algorithms now considered to be machine learning algorithms (MLAs) have existed for nearly a century (e.g., Rosenblatt 1958), interest in MLAs has recently increased exponentially for solving data-driven problems across a variety of fields due to the expanded availability of large, complex datasets that may be difficult to interrogate using other methods, increases...
Authors
Neil Terry, Carole D. Johnson, Frederick Day-Lewis, Beth L. Parker, Lee D. Slater
Characterizing physical properties of streambed interface sediments using in situ complex electrical conductivity measurements Characterizing physical properties of streambed interface sediments using in situ complex electrical conductivity measurements
Streambed sediment physical properties such as surface area, are difficult to quantify in situ but exert a high‐level control on a wide range of biogeochemical processes and sorption of contaminants. We introduce the use of complex electrical conductivity (CC) methods (also known as spectral induced polarization (SIP)) that measure both real and imaginary conductivity to non‐invasively...
Authors
Cheng-Hui Wang, Martin A. Briggs, Frederick Day-Lewis, L. Slater
Experimental shifts of hydrologic residence time in a sandy urban stream sediment-water interface alter nitrate removal and nitrous oxide fluxes Experimental shifts of hydrologic residence time in a sandy urban stream sediment-water interface alter nitrate removal and nitrous oxide fluxes
The sediment–water interfaces (SWI) of streams serve as important biogeochemical hotspots in watersheds and contribute to whole-catchment reactive nitrogen budgets and water-quality conditions. Recently, the SWI has been identified as an important source of nitrous oxide (N2O) produced in streams, with SWI residence time among the principal controls on its production. Here, we conducted...
Authors
T. Hampton, J. Zarnetske, Martin A. Briggs, F. M. P. Dehkordy, K. Singha, Frederick Day-Lewis, Judson Harvey, S. R. Chowdhury, John W. Lane
Formation criteria for hyporheic anoxic microzones: Assessing interactions of hydraulics, nutrients and biofilms Formation criteria for hyporheic anoxic microzones: Assessing interactions of hydraulics, nutrients and biofilms
Recent experimental studies have detected the presence of anoxic microzones in hyporheic sediments. These microzones are small‐scale anoxic pores, embedded within oxygen‐rich porous media and can act as anaerobic reaction sites producing reduction compounds such as nitrous oxide, a potent greenhouse gas. Microbes are a key control on nutrient transformation in hyporheic sediment, but...
Authors
S. R. Chowdhury, J. Zarnetske, M.S. Phanikumar, Martin A. Briggs, Frederick D. Day-Lewis, K. Singha
Geophysical mapping of plume discharge to surface water at a crude oil spill site: Inversion versus machine learning Geophysical mapping of plume discharge to surface water at a crude oil spill site: Inversion versus machine learning
The interpretation of geophysical survey results to answer hydrologic, engineering, and geologic questions is critical to diverse problems for management of water, energy, and mineral resources. Although geophysical images provide valuable qualitative insight into subsurface architecture and conditions, translating geophysical images into quantitative information (e.g., saturation...
Authors
Neil Terry, Frederick D. Day-Lewis, John W. Lane, Jared J. Trost, Barbara A. Bekins