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Monitoring Line Hole Well Field, San Salvador Island, Bahamas, 2015-2017


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Created: May 25, 2021 at 3:42 p.m.
Last updated: Jun 02, 2021 at 7:15 p.m.
DOI: 10.4211/hs.bb01ce1e21214f93b197d6855823af53
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Abstract

San Salvador Island is a small isolated carbonate platform on the southeastern edge of the Bahamian Archipelago. The Line Hole well field is located on an eogenetic karst aquifer on San Salvador Island's northern coast. The island's negative water budget and extensive lake cover have resulted in the upconing of saline water that has fragmented the once continuous freshwater lens. The Line Hole well field consists of several 15-cm diameter wells drilled into the fresh-water lens and arranged in a line perpendicular to the shore. The well field also has two monitoring wells (LH 1, and LH 13), that penetrate approximately 7 m below the water table into higher salinity groundwater. The well field was abandoned in 2016 upon saltwater intrusion to the aquifer. To evaluate the connectivity between the eogenetic karst aquifer monitored by the Line Hole well field and the ocean, we instrumented wells with HOBO U20L-04 loggers to measure pressure and temperature timeseries. We instrumented wells LH4, and LH8, in addition to the monitoring wells LH1 and LH13.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Line Hole Well Field
North Latitude
24.1149°
East Longitude
-74.4878°
South Latitude
24.1119°
West Longitude
-74.4893°

Temporal

Start Date:
End Date:

Content

README.md

Monitoring Line Hole Well Field, San Salvador Island, Bahamas

San Salvador Island is a small isolated carbonate platform on the southeastern edge of the Bahamian Archipelago. The Line Hole well field is located on an eogenetic karst aquifer on San Salvador Island's northern coast. The island's negative water budget and extensive lake cover have resulted in the upconing of saline water that has fragmented the once continuous freshwater lens. The Line Hole well field consists of several 15-cm diameter wells drilled into the fresh-water lens and arranged in a line perpendicular to the shore. The well field also has two monitoring wells (LH 1, and LH 13), that penetrate approximately 7 m below the water table into higher salinity groundwater. The well field was abandoned in 2016 upon saltwater intrusion to the aquifer.

To evaluate the connectivity between the eogenetic karst aquifer monitored by the Line Hole well field and the ocean, we instrumented wells with HOBO U20L-04 loggers to measure pressure and temperature timeseries. We instrumented wells LH4, and LH8, in addition to the monitoring wells LH1 and LH13.

To evaluate the degree of connectivity between the aquifer and the ocean, we recorded a timeseries of water level and temperature within four of the abandoned Line Hole wells. We monitored Line Hole wells 1, 4, 8, and 13 with HOBO U20L-04 loggers in 2015-2017 with sampling rates ranging between 30 seconds and 15 minutes. See below for details on the datasets within this archive, for associated data sets and publications, and contact information.

Data Files

Header

Each data file has a single header

Header description

Date, UTC-5 (str): Timestamp, index, format "YYYY-MM-DD hh:mm:ss" with minute percision. Times are reported in the timezone UTC-5.
P_kPa (float): Water pressure in kilopascals.
Temp, C (float): Water temperature in degrees Celsius.

Unit Abbreviations

kPa : Kilopascal
C : Degree Celsius
UTC : Coordinated Universal Time
UTC-5 : Time offset from UTC of -05:00. In North America, this is the Eastern Time Zone during standard time. The western Caribbean uses UTC-5 year round.

Null Values

While files with null (or no value) are rare for this dataset, we have specified the string "NaN" to be used to fill in missing values. We use this convention across all files.

Well Monitoring Records and Sampling Rates

LH 1 -- Monitoring well
``` Well_LH01.csv start 2015-07-24 11:06:00
end 2015-07-27 07:55:00
sampling rate 1 minute

        start    2017-02-20 10:00:00  
          end    2017-02-21 09:45:00  
sampling rate    5 minutes

```

LH 4
``` Well_LH04.csv
start 2015-07-24 11:11:00
end 2015-07-27 08:14:00
sampling rate 1 minute

        start    2019-01-06 10:00:00  
          end    2019-03-27 12:55:15  
sampling rate    15 minutes

```

LH 8
``` Well_LH08.csv
start 2015-07-24 11:23:00
end 2015-07-27 08:15:00
sampling rate 30 seconds

        start    2015-07-24 11:29:00  
          end    2015-07-27 08:21:00  
sampling rate    1 minute

```

LH 13 -- Monitoring well
``` Well_LH13.csv
start 2017-02-05 12:00:00
end 2017-02-19 08:25:00

        start    2017-04-24 17:00:00  
          end    2017-05-31 13:55:00

        start    2017-11-04 20:00:00  
          end    2017-11-07 17:35:00  
sampling rate    5 minutes

        start    2016-01-12 09:00:00  
          end    2016-01-15 11:17:00  
sampling rate    1 minute

```


Site characteristics

Well | Bottom Elevation | Distance from coast
------- | -- |
LH 1 | -2 m | 180 m
LH 4 | +1 m | 302 m
LH 8 | +1 m | 424 m
LH13 | +1 m | 544 m
||

Age at depth for all wells was MIS 5 Marine Isotope Substage 5 (~80-130 ka)

Associated Datasets



See Gulley et al., 2015 for a description of water chemestry for the Line Hole well field.

See Brithaupt et al., 2020 for results and analysis with this data.


Contact Information

For general questions about this dataset please contact Dr. Jason Gulley of the University of South Florida.
jdgulley@usf.edu, website



HydroShare data archive and readme.md compiled by J. Mejia on 24 May 2021

Additional Metadata

Name Value
Data types, measurements, and unit descriptions Each datafile is structured with the following three columns: index/column 0: Date, UTC-5 (str) : "YYYY-MM-DD hh:mm:ss" with precision to the minute. Time stamp associated with each measurement, times are reported in UTC-5. column 1: P_kPa (float) : Water pressure in kilopascals column 2: Temp_C (float) : Water temperature in degrees Celsius Null values: "NaN"

Related Resources

This resource is described by Breithaupt, C. I. (2020). Porosity and Permeability Extremes in an Eogenetic Carbonate Platform: Mechanisms for Formation and Implications for Fluid Flow (Order No. 28155419). Available from Dissertations & Theses @ University of South Florida - FCLA; ProQuest Dissertations & Theses A&I; ProQuest Dissertations & Theses Global. (2475129033). http://ezproxy.lib.usf.edu/login?url=https://www.proquest.com/dissertations-theses/porosity-permeability-extremes-eogenetic/docview/2475129033/se-2?accountid
This resource is referenced by Breithaupt CI, Gulley JD, Moore PJ, Fullmer SM, Kerans C, Mejia JZ. Flank margin caves can connect to regionally extensive touching vug networks before burial: Implications for cave formation and fluid flow. Earth Surf. Process. Landforms. 2021;1–24. https://doi.org/10.1002/esp.5114

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
U.S. National Science Foundation Collaborative Research: How does groundwater inundation of carbonate island interiors from sea level rise impact surface water-aquifer interactions and evaporative losses? 1743383

How to Cite

Breithaupt, C., R. Knoll, J. Gulley, J. Mejia (2021). Monitoring Line Hole Well Field, San Salvador Island, Bahamas, 2015-2017, HydroShare, https://doi.org/10.4211/hs.bb01ce1e21214f93b197d6855823af53

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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