Dataset: Groundwater Well Water Level Data

Name: Groundwater well water level data collected from porewater profiles within a shallow, sandy subterranean estuary (STE) in Gloucester Point, Virginia USA, from 2018 to 2020
Published: 2023-01-04
Keywords: Subterranean Estuary, groundwater, water level, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.886319.1

Spatial Extent: N:37.248884 E:-76.505324 S:37.248884 W:-76.505324

Temporal Extent: 2018-04-01 - 2020-06-05

Project:

Collaborative Research: Cryptic nitrogen cycling in the anoxic subterranean estuary (Subsurface cryptic N cycle)

Co-Principal Investigator:

Iris C. Anderson (Virginia Institute of Marine Science, VIMS)

Bongkeun Song (Virginia Institute of Marine Science, VIMS)

Craig Tobias (University of Connecticut, UConn - Avery Point)

Student:

Stephanie J. Wilson (Virginia Institute of Marine Science, VIMS)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-01-04

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Groundwater well water level data collected from porewater profiles within a shallow, sandy subterranean estuary (STE) in Gloucester Point, Virginia USA, from 2018 to 2020

Abstract:

These water level data were collected during 2018-2020 from a sandy subterranean estuary (STE) located in Gloucester Point, Virginia, USA using HOBO pressure transducers deployed in groundwater wells. The pressure transducers measured pressure and water temperature every 15 minutes when sampling and were deployed seasonally.

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2023-01-04	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.886319.1	2023-03-27

Methods & Sampling

These water level data were collected during 2018-2020 from a sandy subterranean estuary (STE) located in Gloucester Point, Virginia, USA (37.248884, -76.505324). HOBO pressure transducers were deployed in groundwater wells installed at the Gloucester Point beach along the mid-tide and low-tide lines of the beach. Three pressure transducer wells were constructed out of PVC with 10 centimeters (cm) of slotted PVC centered at 50, 70, and 100 cm depths along the mid-tide line and one at 100 cm depth along the low tide line. The mid-tide line wells were 1 meter apart from one another across the beach face along the mid-tide line. The 100c m wells at the mid- and low-tide lines were 3 meters apart. The pressure transducers measured pressure and water temperature every 15 minutes when sampling and were deployed seasonally. Pressure was converted to water level using the HOBOware software and by manually measuring water depth in the well at deployment and recollection.

Data Processing Description

BCO-DMO Processing:
- concatenated data from 4 separate Excel sheets (one per well) into one data table;
- added Latitude and Longitude columns;
- converted date-time local to ISO 8601 format and added column for UTC date-time;
- renamed fields to comply with BCO-DMO naming conventions.

Data Files

File
water_level.csv (Comma Separated Values (.csv), 6.64 MB) MD5:b9e8d870c3b439473f1c15da425aeba0 Primary data file for dataset ID 886319

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1657801

Deployments

None available yet

Instruments

Onset HOBO U20L water level logger series

Supplied Name: HOBO water level data loggers (U20L)

Supplied Description:

Instrument Type

Generic Name: Onset HOBO U20L water level logger series

Acronym: HOBO U20L

Generic Description:

The HOBO U20L is designed for monitoring changing water levels in a variety of applications including tidal areas, streams, lakes, wetlands, and groundwater. It outputs pressure, water level, and temperature data. The instrument can record samples, sensor measurements at each logging interval, and events data, occurrences such as a bad battery or host connected. The samples are recorded as absolute pressure values, which are later converted to water level readings using software. Absolute pressure is atmospheric pressure plus water head. The deployment of an additional HOBO U20L at the surface can be used to compensate for barometric pressure changes. Each instrument is individually calibrated. They require a coupler and optic base station or HOBO waterproof shuttle to connect to a computer. The instrument is operated with a 3.6 V lithium battery.

This series contains 3 models, U20L-01, U20L-02, and U20L-04, with different operation ranges, calibrated ranges, and burst pressures. The pressure sensor is temperature compensated between 0 and 40 degrees Celsius (C), and calibrated between 69 and a maximum of 400 kPa (depending on the model). Its accuracy is within 0.3 % of the full scale for absolute pressure, and 0.1 % FS for water level readings. The temperature sensor operates between -20 and 50 degrees C, with an accuracy of 0.44 deg C, and a resolution of 0.1 deg C. The drift is 0.1 deg C per year.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Well_ID	Well ID number: MTL 100 = Mid tide line groundwater well with screened pvc centered at depth = 100 cm; MTL 70 = Mid tide line groundwater well with screened pvc centered at depth= 70 cm; MTL 50 = Mid tide line groundwater well with screened pvc centered at depth= 50 cm; LTL 100 = Low tide line groundwater well with screened pvc centered at depth= 100cm.	unitless	Site_ID
ISO_DateTime_Local	Date and time in local time zone (US EST/EDT) in ISO 8601 format Format: %Y-%m-%dT%H:%M	unitless	ISO_DateTime_Local
ISO_DateTime_UTC	Date and time in UTC in ISO 8601 format Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Waterlevel_m	The calculated water level in meters from the top of the well; all wells normalized to a single datum to allow for comparison	meters (m)	depth
AbsPres_kPa	Raw pressure recorded by HOBO pressure transducer in kPa	kilo Pascals (kPa)	press
Temp_C	Temperature in the water level well in degrees C measured by HOBO pressure transducer	degrees Celsius	temp
AbsPresBarom_kPa	Barometric pressure recorded by HOBO pressure transducer in kPa in upland well	kilo Pascals (kPa)	press_bar
Latitude	Latitude of the sampling location	degrees North	lat
Longitude	Longitude of the sampling location	degrees East	lon

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Dataset: Groundwater Well Water Level Data