Temperature data collected in the Indian River Lagoon to evaluate groundwater seepage, Brevard County, Florida, 2017-2018 (ver. 2.0, July 2018)

The data set includes temperature data from the base of the water column and below the bottom of the Indian River Lagoon, Brevard County, Florida. Data were collected near Eau Gallie, Melbourne, Florida and Riverwalk Park, Rockledge, Florida, on the western shore of the Lagoon. These data will ultimately be used to evaluate groundwater seepage.  Data collection includes, temperature profiling using temperature stakes and distributed temperature sensing.   
Temperature stakes consist of 4 to 5 temperature sensors imbedded in 0.6 to 0.9 meter long polyvinyl chloride stakes that are designed to be driven into the sediment at the bottom of the lagoon. Temperature data were collected hourly at a resolution of 0.0625 degrees Celsius (°C), and according to the manufacturer have an accuracy of 0.5 °C. Given this resolution the loggers can store 4096 readings, or 170 days of record.Sensors provide a time series of temperature in the sediments at several depths beneath the bottom of the lagoon. The variations in the temperature profile with depth can be modeled to evaluate groundwater seepage. The locations of these stakes are provided in geographic information system files, and the raw and final data from the individual stakes are provided. 
The initial release included data from 8 stakes deployed on March 22, 2017 and retrieved on April 28, 2017. This data release contains the previously published temperature stake data and the raw and final data from 27 of the  28  temperature stakes  installed between May 25 and June 12, 2017 and retrieved between October 11 and November 3, 2018. Stake number 27 was not recovered.   
Distributed temperature sensing was conducted from May 23, 2017 to May 30, 2017. Distributed temperature sensing was conducted by sending light through a fiber optic cable that had been deployed on the bottom of the lagoon. The light refracted back to a sensor is dependent on the temperature of the cable. The deployed cables were about one kilometer (0.62 mile) long. This method provided temperatures measured every 20 minutes for each meter (3.3 feet) of the fiber-optic cable. The coordinates of the cable were determined using a hand-held geographic positioning system unit. The geospatial temperature data are provided through spreadsheet, comma delimited, and geographic information system files. Raw data files from the distributed temperature sensing instrumentation are also provided. These data were used to help guide the deployment of the temperature stakes. 
The original data files from the 2017 data release are available in the zip file "TemperatureStakeData2.0" in the folder TemperatureStakeDataPublished2017.  
Included in the folder "ReplacedFiles" are the original maps “Rock Ledge Site Map.png” and “IRL_Map_RockLedge_Stakes.tif” on which one of the stakes had incorrectly been labeled as Stake 8, and the original xml file for the 2017 data release.

Tags: brevard-county, florida, flow, groundwater, indian-river-lagoon, lagoon, measurement, seepage, temperature, usgs-59564bb1e4b0d1f9f050d75c
Organization: Department of the Interior