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Data server object:  ADP

    Tidal water velocities in Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2014

Tidal water velocities in Groves Creek salt marsh, Skidaway Island Georgia, USA, 2013-2014

Website: https://www.bco-dmo.org/dataset/682783
Data Type: Other Field Results
Version Date: 2017-02-22

» Tempo and mode of salt marsh exchange (GrovesCreek)
Savidge, WilliamSkidaway Institute of Oceanography (SkIO)Principal Investigator
Brandes, JaySkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Edwards, CatherineSkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Stubbins, AronSkidaway Institute of Oceanography (SkIO)Co-Principal Investigator
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Spatial Extent: N:31.97132 E:-81.01454 S:31.96751 W:-81.02768
Temporal Extent: 2013-08-09 - 2014-07-01

Dataset Description

Tidal water velocities were measured at two stations in Groves Creek salt marsh, Skidaway Island Georgia, USA from August 2013 to July 2014.

Acquisition Description

ADP sampling:
Model Serial # (Hz) Nortek ADPs were used to sample water velocities in the tidal creeks.  (Initial compass setting procedure.  Other setup details?)  Bins were set to 30 or 40 cm with a blanking distance of XXX.  ADP transducer heads were coated with a mixture of cayenne pepper and petroleum jelly to discourage hard fouling.  

Units were affixed to a concrete plate that was lowered from a small boat by hand and rope to the bottom of the creek channel.  Deployments were blind: effort was made to assure that the units were oriented channel-parallel and on flat bottom, but the exact location and orientation of each deployment depended greatly on the swing of the boat’s anchor in the current.  The a priori objective of each deployment was to locate a unit in the center of a straight section of creek seaward of the water quality sampling stations.  Each ADP mount was fixed to a weighted line that ran to the nearest shoreline where it was anchored and marked with a buoy.  Individual deployments lasted ~A to B months.  Units were recovered by retrieving the line at the shore and hand-hauling it to the surface. 

ADPs were returned to the lab for cleaning, downloading data, charging batteries and setting up the unit for the next deployment.  Units were re-deployed at the next convenient opportunity.  Gaps in the record were on the order of a week to a month.

Processing Description

BCO-DMO Processing notes:
- added conventional header with dataset name, PI name, version date
- modified parameter names to conform with BCO-DMO naming conventions
- added station, lat, lon, date, time, ISO_DateTIme columns
- ISO Date format generated from date and time values
- reduced decimal places of lat and lon to 5; reduced depth to 2

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stationstation identifier unitless
deploymentdeployment number unitless
latlatitude; north is positive decimal degrees
lonlongitude; east is positive decimal degrees
dateUTC date formatted as yyyy-mm-dd unitless
timeUTC time; formatted as hh:mm unitless
ISO_DateTime_UTCDate/Time (UTC) ISO formatted based on ISO 8601:2004(E) with format YYYY-mm-ddTHH:MM:SS[.xx]Z unitless
datenum_matlabMATLAB formatted datenum unitless
pitchorientation (pitch) of measurement platform by inclinometer degrees
rollorientation (roll angle) of measurement platform by inclinometer degrees
headingcompass direction (0 being north, 90 being east, etc.) degrees
pressurepressure decibars
depthdepth meters
soundspeedspeed of sound through water meters/second?
temptemperature degrees Celsius
blanking_distance? ?
bin_height? centimeters

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Dataset-specific Instrument Name
Nortek ADP
Generic Instrument Name
Acoustic Doppler Current Profiler
Generic Instrument Description
The ADCP measures water currents with sound, using a principle of sound waves called the Doppler effect. A sound wave has a higher frequency, or pitch, when it moves to you than when it moves away. You hear the Doppler effect in action when a car speeds past with a characteristic building of sound that fades when the car passes. The ADCP works by transmitting "pings" of sound at a constant frequency into the water. (The pings are so highly pitched that humans and even dolphins can't hear them.) As the sound waves travel, they ricochet off particles suspended in the moving water, and reflect back to the instrument. Due to the Doppler effect, sound waves bounced back from a particle moving away from the profiler have a slightly lowered frequency when they return. Particles moving toward the instrument send back higher frequency waves. The difference in frequency between the waves the profiler sends out and the waves it receives is called the Doppler shift. The instrument uses this shift to calculate how fast the particle and the water around it are moving. Sound waves that hit particles far from the profiler take longer to come back than waves that strike close by. By measuring the time it takes for the waves to bounce back and the Doppler shift, the profiler can measure current speed at many different depths with each series of pings. (More from WHOI instruments listing).

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Groves Creek - SkIO
Start Date
End Date
Studies of temporal and compositional changes in exported material in a saltmarsh, both the quantity and quality of dissolved organic matter (DOM) and particulate organic matter (POM) exported from Groves Creek.

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Project Information

Tempo and mode of salt marsh exchange (GrovesCreek)

Coverage: Salt marsh east of Savannah, Georgia, USA.

Description from NSF award abstract:
Salt marshes are critical mediators of the flux of material between the terrestrial and marine realms. The balance of material import, export, and transformation affects both the marsh itself and the surrounding estuary. Previous efforts to understand the role of marshes have concentrated either on examining temporal changes (often at low resolution) of bulk exports, or compositional changes in exported material with little regard for its temporal variability. Researchers working at the Skidaway Institute of Oceanography contend that both the quantity and quality of materials exchanged between marsh and estuary in tidally-dominated systems along the southeastern US coast vary significantly in response to semidiurnal, diurnal, tidal, meteorological and seasonal forcing, and that this variability must be included when considering the total contributions of marshes to carbon cycling along the land-ocean boundary. This study will utilize a three-pronged strategy to assess both the quantity and quality of dissolved organic matter (DOM) and particulate organic matter (POM) exported from Groves Creek, a well-characterized meso-tidal salt marsh in coastal Georgia. In particular, by evaluating how marsh function responds to a full spectrum of present environmental conditions, this project will provide tangible insight into how carbon cycling in these critical regions will respond to anticipated changes in those conditions.

This project is related to the project "Marine priming effect - molecular mechanisms for the biomineralization of terrigenous dissolved organic matter in the ocean" found at https://www.bco-dmo.org/project/554157.

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Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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This document is created by info v 4.1f 5 Oct 2018 from the content of the BCO-DMO metadata database.    2021-01-27  07:30:46