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Type: | Resource | |
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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 | |
Citation: | See how to cite this resource | |
Content types: | Single File Content |
Sharing Status: | Published |
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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
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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
- GRC Weather Station Data, San Salvador Island, Bahamas.
- LineHole Well Field Monitoring, San Salvador Island, Bahamas.
- Pressure, Temperature, and Specific Conductivity from Lakes on San Salvador Island, Bahamas.
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
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/![CC-BY](https://storage.googleapis.com/hydroshare-prod-static-media/static/img/cc-badges/CC-BY.04d377d96855.png)
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