Concentration of chemical constituents in lake sediments from selected coring locations on Lake Lanier, Georgia, May 2018 (ver. 2.0, June 2021)
Dates
Publication Date
2019-06-14
Start Date
2018-05-21
End Date
2018-05-25
Revision
2021-06-22
Last Revision
2021-06-22
Citation
Riley, J.W., Fitzgerald, S.A., Wilson, J.T., and Calhoun, D.L., 2019, Concentration of chemical constituents in lake sediments from selected coring locations on Lake Lanier, Georgia, May 2018 (ver. 2.0, June 2021): U.S. Geological Survey data release, https://doi.org/10.5066/P920L16R.
Summary
The data herein were collected in support of a larger study in Gwinnett County, Georgia, on the potential impacts of on-site waste water treatment (septic systems) on Lake Lanier water quality. Until recently, a missing component in this assessment was the inclusion of historical sediment and associated nutrient accumulation data from the lake to place results in a broader context. To this end, the USGS collected sediment cores from ten locations that varied in water depth as well as proximity to residential areas with septic systems. Samples were collected using either a gravity corer or box corer depending on site conditions. Cores were sub-sampled and processed for laboratory analyses. Laboratory analyses were conducted to evaluate [...]
Summary
The data herein were collected in support of a larger study in Gwinnett County, Georgia, on the potential impacts of on-site waste water treatment (septic systems) on Lake Lanier water quality. Until recently, a missing component in this assessment was the inclusion of historical sediment and associated nutrient accumulation data from the lake to place results in a broader context. To this end, the USGS collected sediment cores from ten locations that varied in water depth as well as proximity to residential areas with septic systems. Samples were collected using either a gravity corer or box corer depending on site conditions. Cores were sub-sampled and processed for laboratory analyses. Laboratory analyses were conducted to evaluate nutrient concentrations (carbon, nitrogen, and phosphorus) in sediments, stable isotope ratios of carbon and nitrogen in the sediment organic matter, cesium-137 for select samples, and trace and heavy metals. The latter constituents (cesium-137 and trace and heavy metals) were used primarily to help constrain mass accumulations rates (MAR) and assign ages to each sub-sample so that temporal changes in nutrient concentrations could be evaluated in concert with timing of shoreline development.
Version 2.0 adds three new data files: 1) information linking specific replicate sediment cores to specific laboratory analyses, 2) activities of five radioisotopes (cesium-137, lead-210, radium-226, thorium-234, and potassium-40), and 3) the concentration of biogenic silica of sediment samples from all 10 coring sites. This revision also corrects a shift in the latitude and longitude of the coring sites.
Click on title to download individual files attached to this item.
Lake.Lanier.Sediment.Core.Data.Version.2.xml Original FGDC Metadata
View
23.02 KB
application/fgdc+xml
Lake Lanier sediment coring site information.REV.csv “Updated core descriptions”
1.59 KB
text/csv
revision.history.txt “revision history”
1.15 KB
text/plain
Purpose
These data were collected to better understand the historical accumulation of sediment and nutrients at select locations in Lake Lanier. The locations were selected to supplement a larger study investigating the role of septic systems on Lake Lanier water quality. Sites were distributed among selected study coves with residential septic systems adjacent to the lake and also include a reference cove without development. Potential users of this data should recognize the rationale driving the site selection process and the subsequent effect on the associated data collected. Furthermore, it is unknown whether the data from the selected sites are representative of the lake as a whole.
