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These data were collected in coordination with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. Water quality data were collected using an Ecomapper Autonomous Underwater Vehicle (AUV) and measured parameters include temperature, specific conductance, salinity, water density, pH, dissolved oxygen, total chlorophyll, and blue-green algae. These data are provided in two formats: a CSV file named AUV_WQ_South.csv, and in the Environmental Systems Research Institute (ESRI) shapefile format consisting of a group of files that have been compressed into a zip archive that is named AUV_WQ_South_shapefile.zip.
In summer 2018, a total of 43 passive seismic surveys were conducted in the Des Moines River floodplain. The horizontal-to-vertical spectral ratio (HVSR) method is a passive seismic technique that uses a three-component seismometer to measure the vertical and horizontal components of ambient seismic noise. A resonance frequency (f0) is induced in the unconsolidated deposits when there is a substantial contrast (greater than 2:1) in shear-wave acoustic impedance between the overburden and the bedrock. The f0 is determined from the analysis of the spectral ratio of the horizontal and vertical components of the seismic data. The thickness of the overburden can be related to the f0. In general, lower f0 relates to thicker...
Categories: Data;
Tags: Aquifer Characterization,
Des Moines,
Geophysics,
Horizontal-to-Vertical Spectral Ratio,
Hydrogeology,
A suite of geophysical methods was used along the Des Moines River, Beaver Creek, and in the Des Moines River floodplain in Des Moines, Iowa to support the hydrogeologic characterization of the alluvial aquifer associated with the river. The aquifer consists of sands and gravels underlain by weathered shale bedrock. Groundwater from the aquifer along with surface water sources are used for municipal drinking water for the City of Des Moines and surrounding communities. The raw data provided in this data release are minimally processed to filter out erroneous measurements. Data provided in this data release includes continuous resistivity profiling (CRP) and continuous seismic profiling (CSP) that were collected...
Electrical resistivity tomography (ERT) surveys were collected in summer 2018 to support hydrogeologic characterization of the alluvial aquifer. For this investigation, 7 surveys were conducted with ERT methods. At each site three surveys were collected, including dipole-dipole (DD), Wenner-Schlumberger (WS), and Inverse Schlumberger (SI )configurations. For each survey a total of 56 electrodes spaced 5-meters (m) apart were used. During the ERT measurement, current is injected through two current electrodes and voltage is measured sequentially across multiple pairs of potential electrodes, which is used to determine the apparent resistivity of the subsurface. Results were combined into a merged dataset. ERT surveys...
Categories: Data;
Tags: Aquifer Characterization,
Des Moines,
Electrical Resistivity Tomography,
Geophysics,
Hydrogeology,
A suite of geophysical methods was used along the Cedar River in Cedar Rapids, Iowa to support the hydrogeologic characterization of the alluvial aquifer associated with the river and to assess the area for suitability for larger-scale airborne geophysics. The aquifer is comprised of sand and gravel, interbedded with finer sediments, and underlain by carbonate-dominated bedrock. The aquifer is the principal source of municipal drinking water for the City of Cedar Rapids. The raw data provided here includes waterborne continuous resistivity profiling (CRP) and continuous seismic profiling (CSP) data (collected at the same time), electrical resistivity tomography (ERT) profiles, and horizontal-to-vertical spectral...
In June 2017, the U.S. Geological Survey (USGS)collected borehole geophysical logs to characterize the shallow alluvial aquifer in and near Cedar Rapids, Iowa. Borehole geophysical logs were collected from nine shallow boreholes to identify geophysical properties of the aquifer in the area surrounding the boreholes. Electromagnetic induction logs were used to determine the electrical properties of the fluid and formation surrounding the borehole. A natural gamma tool was used to identify the naturally occurring gamma radiation that is emitted from the earth materials. Nuclear magnetic resonance (NMR) tools were used to measure the water content and estimate the pore-size distribution and hydraulic conductivity (K)...
In April 2015, approximately 19 miles of continuous resistivity profiling (CRP) surveys were collected on the Cedar River in Cedar Rapids, Iowa. The CRP method was used to characterize the resistivity of the water column and subbottom materials. Five CRP profiles were collected concurrently with the continuous seismic methods. For this investigation, 11 electrodes spaced 10 m apart and mounted in a streamer were towed behind the boat and data were collected using the dipole-dipole array type. The first two electrodes, closest to the boat, were used to inject current into the water and subbottom materials, and eight electrical potential measurements were made using the remaining nine electrodes. With this system,...
These data were collected in coordination with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. Data were collected while trailing the Ecomapper with an EXO2 multi-parameter sonde suspended at the water surface from a manned boat propelled by a trolling motor. An EXO 2.0 handheld controller was used for coordinate information. Data collected inlcludes barometric pressure, water temperature, specific conductance, pH, dissolved oxygen, total chlorophyll, and blue-green algae. These data are provided in two formats: a CSV file named EXO2_SWQ_South.csv, and in the Environmental Systems Research Institute (ESRI) shapefile format consisting...
These data were collected in cooperation with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. Water-quality data were collected using an Ecomapper Autonomous Underwater Vehicle (AUV) and measured parameters include temperature, specific conductance, salinity, water density, pH, dissolved oxygen, total chlorophyll, and blue-green algae. These data are provided in two formats: a CSV file named AUV_WQ_North.csv, and in the Environmental Systems Research Institute (ESRI) shapefile format consisting of a group of files that have been compressed into a zip archive that is named AUV_WQ_North_shapefile.zip.
In September 2018, approximately 13 miles of continuous seismic profiling (CSP) surveys were collected on the Des Moines River and Beaver Creek in Des Moines, Iowa. The swept frequency (chirp) CSP subbottom profiler was used to characterize the unconsolidated materials above the bedrock. The CSP subbottom profiler is an acoustic sound source that travels through the water column and reflects off the bottom and sub-bottom layers and is received at the transducer. Applying a water column velocity, the two-way travel time can be converted to distance. CSP methods provide the depth to water bottom, and when sufficient signal penetration is achieved, CSP can be used to delineate the depth of subbottom layers and topography...
Categories: Data;
Tags: Aquifer Characterization,
Continuous Seismic Profiling,
Des Moines,
Geophysics,
Hydrogeology,
These data were collected in coordination with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. Data were collected while trailing the Ecomapper with an EXO2 multi-parameter sonde suspended at the water surface from a manned boat propelled by a trolling motor. An EXO 2.0 handheld controller was used for coordinate information. Data collected includes barometric pressure, water temperature, specific conductance, pH, dissolved oxygen, total chlorophyll, and blue-green algae. These data are provided in two formats: a CSV file named EXO2_SWQ_North.csv, and in the Environmental Systems Research Institute (ESRI) shapefile format consisting of...
These data were collected in coordination with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. Data were collected using an EXO2 suspended 5.5 feet below a kayak. Sensor was dragged along the bottom of the lake except in instances where water depth was greater than 5.5 ft. The continuous profiling was conducted while paddling a kayak using Hypack 2017a to navigate survey lines set on a georeferenced background map to the best of ability. An EXO 2.0 handheld controller was used for coordinate information. Data collected includes, water temperature, specific conductance, pH, dissolved oxygen, and turbidity. These data are provided in two...
In April 2015, approximately 22 miles of continuous seismic profiling (CSP) surveys were collected on the Cedar River in Iowa. The swept frequency (chirp) CSP subbottom profiler was used to characterize the unconsolidated materials above the bedrock. The CSP subbottom profiler is an acoustic sound source that travels through the water column and reflects off the bottom and sub-bottom layers and is received at the transducer. (see Collecting resistivity and seismic data Cedar River IA 2.JPG. Applying a water column velocity, the two-way travel time can be converted to distance. CSP methods provide the depth to water bottom, and when sufficient signal penetration is achieved, CSP can be used to delineate the depth...
In June and July of 2020, 45 groundwater wells in McHenry County, Illinois, were sampled for water quality (field properties, major ions, nutrients, and trace metals) and 12 wells were sampled for contaminants of emerging concern (pharmaceuticals, pesticides, and wastewater indicator compounds). Quality-assurance and quality-control samples were collected during the June and July 2020 sampling that included equipment blanks, field blanks, and replicates. The results of these samples were used to understand the sources of bias and variability associated with sample collection, processing, storage, and shipping. This data release contains one comma separated values files containing the results of the quality-control...
Categories: Data;
Tags: Illinois,
McHenry County,
USGS Science Data Catalog (SDC),
United States,
Water Quality,
These data were collected in coordination with the U.S. Geological Survey Hydrogeophysics Branch for the National Crude Oil Spill Fate and Natural Attenuation Research Site. An EXO2 multi-parameter sonde was used to vertically characterize water quality at point locations around the perimeter of the north unnamed lake, and in area of the lake suspected to contain a hydrocarbon plume. Measurements were taken from a kayak using Hypack 2017a to navigate and set target points. Data collected includes barometric pressure, dissolved oxygen, specific conductance, turbidity, pH, and water temperature. At each location and specific depth there were typically multiple measurements made, especially in the organic sediments...
Electrical resistivity tomography (ERT) surveys were collected in April 2015 to support hydrogeologic characterization of the alluvial aquifer and to assess the suitability of larger-scale airborne geophysics. For this investigation, five sites were surveyed with ERT methods. At each site three surveys were collected, including dipole-dipole, Schlumberger, and inverse Schlumberger configurations. For each survey a total of 56 electrodes spaced 5-meters (m) apart were used. During the ERT measurement, current is injected through two current electrodes and voltage is measured sequentially across multiple pairs of potential electrodes, which is used to determine the apparent resistivity of the subsurface. Results were...
The National Crude Oil Spill Fate and Natural Attenuation Research Site is located near where about 1.7 million liters of crude oil spilled in 1979. Much of the oil spill leached into groundwater which flows towards an unnamed lake at the site. The U.S. Geological Survey Branch of Hydrogeophysics has been working to map the plume's extent on land and into the lake using a variety of geophysical techniques. In 2018, the group was able to map a group of anomalies within the lake consisting of elevated specific conductance concentrations. It was determined that these specific conductance anomalies were likely attributed to hydrocarbon plumes leaching into the lake. In 2019, the U.S. Geological Survey Central Midwest...
In April 2015, a total of 34 passive seismic surveys were conducted in the Cedar River Floodplain. The horizontal-to-vertical spectral ratio (HVSR) method is a passive seismic technique that uses a three-component seismometer to measure the vertical and horizontal components of ambient seismic noise. Seismic noise in the range of approximately 0.1 to 1 Hertz (Hz) is caused by ocean waves, large regional storms, and tectonic sources. A resonance frequency (f0) is induced in the unconsolidated deposits when there is a substantial contrast (greater than 2:1) in shear-wave acoustic impedance between the overburden and the bedrock. The f0 is determined from the analysis of the spectral ratio of the horizontal and vertical...
In September 2018, approximately 13 miles of continuous resistivity profiling (CRP) surveys were collected on the Des Moines River and Beaver Creek in Des Moines, Iowa. The CRP method was used to characterize the resistivity of the water column and the underlying geologic materials. Three CRP line profiles were collected during one day of field work and were collected concurrently with continuous seismic profiling (CSP) methods. For this investigation, 11 electrodes spaced 10 m apart and mounted in a streamer were towed behind a manned boat and data were collected using the dipole-dipole array type. The first two electrodes, closest to the boat were used to inject current into the water and river bottom, and eight...
Categories: Data;
Tags: Aquifer Characterization,
Continuous Resistivity Profiling,
Des Moines,
Geophysics,
Hydrogeology,
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