03_Field measurements of temperature in vertical lake-bottom profiles near a permeable reactive barrier, Ashumet Pond, Falmouth, MA

Dates

Publication Date: 2018-05-22
Time Period: 2015-08-21
Time Period: 2015-09-04

Citation

McCobb, T.D., Briggs, M.A., LeBlanc, D.R., Day-Lewis, F.D., and Johnson C.D., 2018, Temperature and seepage data from a lake-bottom permeable reactive barrier, Ashumet Pond, Falmouth, MA, 2004-2015: U.S. Geological Survey data release, https://doi.org/10.5066/F78914ZS.

Summary

This dataset contains field measurements of temperature in shallow vertical profiles beneath a lake-bottom in the vicinity of a permeable reactive barrier (PRB) at Ashumet Pond, Falmouth, MA. From August 21, 2015 – September 3, 2015 vertical temperature profilers designed to quantify groundwater upwelling dynamics were installed at seven locations. Hollow stainless steel pipes (2.5 cm OD) were slotted horizontally to allow installation of iButton thermal data loggers (Maxim Integrated DS1922L, 0.0625 oC precision) protected with waterproof silicone caulking. The temperature profilers were gently tapped into the cobbly bed by first driving guide-hole of slightly smaller diameter. After installation, the thermal loggers were located [...]

Summary

This dataset contains field measurements of temperature in shallow vertical profiles beneath a lake-bottom in the vicinity of a permeable reactive barrier (PRB) at Ashumet Pond, Falmouth, MA. From August 21, 2015 – September 3, 2015 vertical temperature profilers designed to quantify groundwater upwelling dynamics were installed at seven locations. Hollow stainless steel pipes (2.5 cm OD) were slotted horizontally to allow installation of iButton thermal data loggers (Maxim Integrated DS1922L, 0.0625 oC precision) protected with waterproof silicone caulking. The temperature profilers were gently tapped into the cobbly bed by first driving guide-hole of slightly smaller diameter. After installation, the thermal loggers were located at 0.01, 0.04, and 0.11 m depths, except at two locations where a 0.07 m depth logger was also included. Thermal time series at locations S1 and S4 indicated poor physical coupling between the profiler and bed sediments, and possibly preferential flow along the profiler housing, so these locations were excluded from final seepage flux modeling. Vertical flux results from the most shallow temperature depth paired time series were derived from the remaining 5 bed locations using the “vflux_qar_opt”" analytical relationship using the automated VFLUX software run in Matlab (version 1.2.5). vflux1.2.5 can be downloaded for free at: http://hydrology.syr.edu/vflux/. A porosity of 0.38, solid grain heat capacity of 0.47 cal/cm3-C, liquid water heat capacity of 1.0 cal/cm3-C, thermal diffusivity of 0.13 m2/d, and beta of 0.0001 m was used for all calculations. All profiles indicated upwelling of groundwater that was variable over time. The absolute value of calculated vertical flux rates is presented so that the negative fluxes determined by VFLUX that indicate upward flow are converted to positive values as reported in the manuscript.

This data release is provided in support of the journal article:
McCobb, T.D., Briggs, M.A., LeBlanc, D.R., Day-Lewis, F.D., and Johnson C.D., 2018, Evaluating long-term patterns of decreasing groundwater discharge through a lake-bottom permeable reactive barrier: Journal of Environmental Management,v. 220: p. 233–245. https://doi.org/10.1016/j.jenvman.2018.02.083.

This data release contains all files required to replicate the results of the associated journal article.

Contacts

Point of Contact :: Timothy D McCobb
Originator :: Timothy D McCobb, Martin A Briggs, Denis R LeBlanc, Frederick D Day-Lewis, Carole D Johnson
Metadata Contact :: Timothy D McCobb
Publisher :: U.S. Geological Survey
SDC Data Owner :: New England Water Science Center
USGS Mission Area :: Environmental Health
Distributor :: U.S. Geological Survey - ScienceBase

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CSV_Field_Measurements_Temperature_Vertical_Profiles_Ashumet_Pond_MA_2015.xml Original FGDC Metadata	View	14.52 KB	application/fgdc+xml
CSV_Field_Measurements_Temperature_Vertical_Profiles_Ashumet_Pond_MA_2015.csv		497.01 KB	text/csv

Purpose

These data were obtained in order to assess vertical groundwater seepage at sub-daily intervals in the area of a lake-bottom permeable reactive barrier.

03_Field measurements of temperature in vertical lake-bottom profiles near a permeable reactive barrier, Ashumet Pond, Falmouth, MA

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