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Locations of groundwater discharging to surface water are hydrologically and ecologically important for nutrient processing and thermal refugia, yet little is known about the spatial distribution of groundwater discharges at the river network scale. Groundwater discharge locations can be used to identify anomalous groundwater discharging to surface water as colder groundwater interfaces with warmer surface water in late summer. This data release contains GPS locations, thermal infrared images, and direct temperature measurements of groundwater discharges throughout the Farmington and Housatonic River watersheds. These data were collected in late summer/ early fall 2019 to characterize the spatial distribution of groundwater discharges throughout the Farmington and Housatonic River networks. The initial data release contains groundwater discharge locations and associated thermal images along the Salmon Brook River in the Farmington River watershed. Additional data for the Farmington and Housatonic River watersheds will be added to this dataset in the future. This dataset contains 3 files: 1) SalmonBrook_FLIR.zip is a zipped directory containing thermal infrared and real color images. 2) SalmonBrook_Image_Details.csv contains attribute information for each thermal image. 3) SalmonBrook_Seeps.shp is an ESRI shapefile of the groundwater discharge locations with FLIR thermal images and field notes. Files associated with this shapefile include: the database file SalmonBrook_Seeps.dbf, the projection file SalmonBrook_Seeps.prj, and the geodatabse file SalmonBrook_Seeps.shx. 4) LegacyN_FLIR_2019_readme is a high level readme text file that describes all of the files on the root landing page.
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Passive seismic depth to bedrock data collected along streams of the Farmington River watershed, CT, USA
Using the horizontal-to-vertical spectral-ratio (HVSR) method, we infer regolith thickness (i.e., depth to bedrock) throughout the Farmington River Watershed, CT, USA. Between Nov. 2019 and Nov. 2020, MOHO Tromino Model TEP-3C (MOHO, S.R.L.) three-component seismometers collected passive seismic recordings along the Farmington River and the upstream West Branch of Salmon Brook. From these recordings, we derived resonance frequencies using the GRILLA software (MOHO, S.R.L.), and then inferred potential regolith thicknesses based on likely shear wave velocities, Vs, intrinsic to the underlying sediment. Three potential shear wave velocities (Vs = 300m/s, 337m/s, 362 m/s) were considered for Farmington River watershed sediments, providing a range of potential depth estimates along the Farmington. This release contains raw passive seismic recording data, processed resonance frequency data, and the resulting inferred depth estimates displayed in both tabular and vector form. This dataset currently contains 3 zipped files: 1) ?Processed.zip? is a zipped directory containing .asc text files of processed passive seismic data, individual processed reports, tabulated results, and an associated summary text file, 'readme_Processed.txt'; 2) 'Raw.zip' contains .saf text files of passive seismic recordings and an associated 'readme_Raw.txt;' and 3) ?XYLegacyN_HVSR.zip'? contains ESRI shapefile of HVSR point locations with attribute data & a map image offering a visualization of the depth results (where, Vs = 300m/s). Additionally, the main folder contains LegacyN_HVSR_readme.txt which describes these sub-directories in further detail.
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- Award ID(s):
- 1824820
- PAR ID:
- 10478254
- Publisher / Repository:
- U.S. Geological Survey
- Date Published:
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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We used spatial data from previously mapped preferential groundwater discharges throughout the Farmington River watershed in Connecticut and Massachusetts (https://doi.org/10.5066/P915E8JY) to guide water sample collection at known locations of groundwater discharging to surface water. In 2017 and 2019 - 2021, samples were collected during general river baseflow conditions (July ? November, less than 30.9 cms mean daily discharge (USGS gage 01189995, statistics 2010-2022) when the riverbank discharge points were exposed. We collected a suite of dissolved constituents and stable isotopes of water directly in the shallow saturated sediments of active points of discharge, and coincident stream chemical samples were also collected adjacent to locations of groundwater discharge. Data collected includes nutrients (NO3, NH4, Cl, SO4, PO4, dissolved organic carbon (DOC), and total nitrogen (TN)), greenhouse gases (CO2, CH4, and N2O), dissolved gases (N2, dissolved oxygen (DO)), conductivity, sediment characteristics, temperature, and spatial information. This dataset includes 2 main files: 1) Farmington_Chemistry_2017_2021.csv contains attribute information for each biogeochemical constituent collected at preferential groundwater discharges along the Farmington River network. 2)Farmington_Temporal_Cl_Rn_Iso_2020.csv contain attribute information for source characteristic data (Chloride, Radon, Isotope) collected at locations of repeat sampling at 5 groundwater seep faces along the Farmington River (Alsop and Rainbow Island).more » « less
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