1b:I[42426,["/_next/static/immutable/chunks/1xctgzqre-wsy.js","/_next/static/immutable/chunks/06_-wz6pdtp2b.js","/_next/static/immutable/chunks/30e52g49hg40p.js","/_next/static/immutable/chunks/02yq6tul2z-oh.js","/_next/static/immutable/chunks/10bx_ec2vj7n_.js","/_next/static/immutable/chunks/33bfn03fo8xnt.js","/_next/static/immutable/chunks/0tfjf78scu61b.js","/_next/static/immutable/chunks/31xnvej4n1bi9.js"],"default"] 1c:Tf09,NSF Award Abstract: This project focuses on the role of large underwater sand formations, particularly at the mouths of estuaries, in the cycling of nutrients and organic materials. "Megaripples" are common features on marine sediments where bottom currents are rapid. In the northeastern Gulf of Mexico, these sand dune-like features are up to half a meter in height, with wavelengths reaching 20 meters. The investigators propose that megaripples act as large filter systems that rapidly convert dissolved and solid organic matter into inorganic carbon and nutrients, and thus influence the biological productivity of coastal waters. They propose to use a one-kilometer long megaripple field in the inlet of Chotawhatchee Bay, in the northeastern Gulf of Mexico, as a natural laboratory for studying these processes. In addition, they will conduct laboratory experiments to investigate the filter processes at a smaller scale. By producing data on the functioning of megaripples, the project addresses a knowledge gap that has implications on our understanding of the cycles of matter in coastal waters. The project offers opportunities for both graduate and undergraduate students in learning state-of-the-art techniques. The students will gain experience in working on high frequency data acquisition and analysis of 'big data'. To enhance outreach, the researchers will develop and teach two courses on Permeable Sediment Biogeochemistry and Aquatic Eddy Covariance Studies for the Saturday at the Sea program offered by Florida State University. Results will be disseminated via scientific journals, conference presentations and public lectures, and directly to the Apalachicola-National Estuarine Research Reserve (NERR), which will make the results available to the other 28 NERR sites. The two main project objectives are: 1) demonstrate the general function of megaripples as biocatalytical filters, and 2) demonstrate that common inlet megaripples contribute to nutrient retention in coastal bays. A 1 km long megaripple field in the inlet of Chotawhatchee Bay (wavelengths: ~20 m, amplitudes: 20 to 40 cm) in the northeastern Gulf of Mexico will be used as an in-situ laboratory. Measurements will characterize megaripple topography and the water flowing over them. Salinity and suspended particles are utilized as natural tracers to quantify solute and particle entrainment into the megaripples. This project will deploy non-invasive aquatic eddy covariance instruments equipped with newly developed robust sensors to quantify sedimentary remineralization in the flushed megaripple bed. This technique integrates the benthic oxygen flux over a large section of the megaripple field, while including the natural dynamics of currents and light. Real-time water column measurements with a boat-mounted flow-through analyzer permit rapid quantification of large horizontal gradients of key water column parameters. The in-situ measurements will be combined with laboratory column reactor experiments that quantify nutrient re-mobilization through organic carbon mineralization in flushed megaripple sand. The megaripple field in the inlet of Chotawhatchee Bay is easily accessible from shore and by small boat, expediting instrument deployments and in-situ measurements while reducing project costs. Synthesis of all data will produce a conceptual and quantitative understanding of megaripples as natural biocatalytical filters. Because transport and reaction in megaripples are governed by basic physical and biogeochemical processes, these results will reveal information on the general biogeochemical functioning of megaripples that so far is not available. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.6:["$","$L1b",null,{"dataset":{"_id":"986759","description":"","problem":"During the 2024 deployment (9/23/24 20:48), an anchoring boat moved the AWAC from its original position causing a shift in the data.","acquisition":"

Measurements were recorded in the West Channel of Choctawhatchee Bay near Destin, FL (Lat: 30.3925°N, Long: -86.5233°W). The channel is 130 to 180 m wide, about 2 km long and 3 to 7 m deep.

The Doppler profiler was a Nortek Acoustic Wave And Current Profiler (AWAC). The data set presents in-situ current flow measurements recorded with an upward looking acoustic Doppler profiler. The water depth within the channel ranges from 3 to 7 m and varies with the tide (diurnal tide, range 0.5 m). The Doppler profiler was positioned near the middle of the channel at approximately 3.9 m water depth and recorded flow velocity and directions at 0.5 m vertical intervals from 0.9 m above the bottom to 3.4 m above the bottom. The instrument heading was 130.2 degrees.

\n","processing":"

The AWAC records were processed using the NORTEK software AWAC-AST, Version 1.47. The data analyses provided current velocity (m/s) and current direction (degrees) for the water depth 0.9, 1.4, 1.9, 2.4, 2.9, and 3.4 m above the sediment surface.

\n","bcodmoProcessing":"- Imported \"AWAC2024.xlsx\" into the BCO-DMO system\r\n- Converted \"date\" and \"time\" into an ISO formatted date time in EDT, \"ISO_DateTime_Local\"\r\n- Converted \"ISO_DateTime_Local\" into UTC field, \"ISO_DateTime_UTC\"\r\n- Removed special characters and spaces from parameter names in compliance with BCO-DMO guidelines\r\n- Removed \"Speed_7\" and \"Dir_7\" parameters upon submitter request\r\n- Exported file as \"986759_v1_west_channel_currents_2024.csv\"","title":"Structure of current flow in the West Channel in Choctawhatchee Bay, Florida from Sep 18 to Sep 24, 2024","nickname":"West Channel currents 2024","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2025-12-01T05:00:00.000Z","abstract":"The data set presents in-situ current flow measurements recorded with an upward looking acoustic Doppler profiler in the West Channel of Choctawhatchee Bay near Destin, FL (Lat: 30.3925°N, Long: -86.5233°W). The water depth within the channel ranges from 3 to 7 m and varies with the tide (diurnal tide, range ~0.5 m). The Doppler profiler was positioned near the middle of the channel at approximately 3.9 m water depth and recorded flow velocity and directions at 0.5 m vertical intervals from 0.9 m above the bottom to the water surface. ","citation":"Huettel, M., Berg, P. (2025) Structure of current flow in the West Channel in Choctawhatchee Bay, Florida from Sep 18 to Sep 24, 2024. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-12-01 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.986759.1 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.986759.1","versionDate":"2025-12-01","versionId":"1","year":"2025","title":"Structure of current flow in the West Channel in Choctawhatchee Bay, Florida from Sep 18 to Sep 24, 2024","authors":"Huettel, M., Berg, P.","publisher":"Biological and Chemical Oceanography Data Management Office (BCO-DMO)."},"doi":"10.26008/1912/bco-dmo.986759.1","release_date":null,"field_dataset_location":"Measurements were recorded in the West Channel of Choctawhatchee Bay near Destin, FL (Lat: 30.3925°N, Long: -86.5233°W). The channel is 130 to 180 m wide, about 2 km long and 3 to 7 m deep. ","temporal_extent":{"start":"2024-09-18T04:00:00.000Z","end":"2024-09-24T04:00:00.000Z"},"temporal":{"resolution":"time:unitDay","type":"time:Interval","start":{"value":"1726632000","label":"2024-09-18"},"end":{"value":"1727150400","label":"2024-09-24"}},"spatial_extent":{"shape":"point","center":{"latitude":30.3925,"longitude":-86.5233},"wkt":" POINT (-86.5233 30.3925)","north":0,"east":0,"south":0,"west":0},"dataset_type":["Other Field Results"],"keywords":["oceans"],"data_files":[{"id":"989851","title":"986759_v1_west_channel_currents_2024.csv","url":"https://datadocs.bco-dmo.org/dataset/986759/file/XYK8nGOhBDKEAn/986759_v1_west_channel_currents_2024.csv","showTableUrl":"https://www.bco-dmo.org/dataset/986759/data/view/989851","description":"Primary data file for dataset ID 986759, version 1","filename":"986759_v1_west_channel_currents_2024.csv","bytesize":723297,"checksum":{"value":"fa07f017da3a8664162834f371dd6073","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"","date":"","isPublicDuringEmbargo":false,"primaryDataFile":true,"showTable":true,"restricted":false}],"supplemental_files":[],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"811921","name":"Peter Berg"},"performedAtOrganization":{"_id":"638548","name":"University of Virginia"}},{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"811916","name":"Markus Huettel"},"performedAtOrganization":{"_id":"676110","name":"Florida State University"}},{"role":{"_id":"145","name":"BCO-DMO Data Manager"},"performedBy":{"_id":"924467","name":"Audrey Mickle"},"performedAtOrganization":{"_id":"191","name":"Woods Hole Oceanographic Institution"}}],"deployments":[],"funding":[{"_id":"895941","name":"OCE-1851290","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1851290"}],"instruments":[{"_id":"989093","name":"Nortek Acoustic Wave And Current Profiler (AWAC)","description":"Technical Specifications:\nAcoustic frequency: 600kHz\nAcoustic beams: 4 beams, one vertical, three slanted at 25°\nVertical beam opening angle: 1.7°\nOperational mode: Stand-alone\nCurrent Profile\nDepth cell size: 0.5m (600kHz)\nNumber of cells: 6 - 12\nVelocity range: ±10 m/s horizontal, ±5 m/s along beam\nAccuracy: 1% of measured value ±0.5 cm/s","type_id":"858550","type_name":"Acoustic Wave And Current Profiler","type_desc":"A family of instruments that simultaneously measure current profiles and wave height and direction designed for coastal monitoring.","type_acronym":"AWAC"}],"parameters":[{"_id":"989094","name":"Date","format":"%Y-%m-%d","frictionlessType":"date","description":"

Date of measurement in EDT

","units":{"_id":"","name":"unitless"},"type":{"_id":"1070","name":"date","description":"

date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)

"}},{"_id":"989095","name":"Time","format":"%H:%M:%S","frictionlessType":"time","description":"

Time of measurement in EDT

","units":{"_id":"","name":"unitless"},"type":{"_id":"1075","name":"time","description":"

Time GMT defined as HHMM; time of day; generally reported in GMT as HHMM (hours and minutes) but may also be HH.H (decimal hours) or HHMMSS (hours; minutes and seconds); in EqPac time is reported as Hawaii local time

"}},{"_id":"989096","name":"Battery","format":"","frictionlessType":"number","description":"

Battery voltage of the instrument in Volt

","units":{"_id":"","name":"Volts (V)"},"type":{"_id":"701981","name":"wave_stats","description":"

This term contains all parameters pertaining to the measurement of waves. Includes wave height, direction, period, and energy spectra.

"}},{"_id":"989097","name":"Heading","format":"","frictionlessType":"number","description":"

Heading of the instrument in degrees of the compass

","units":{"_id":"","name":"Degrees"},"type":{"_id":"853","name":"heading","description":"

heading of ship or platform

"}},{"_id":"989098","name":"Pitch","format":"","frictionlessType":"number","description":"

Deviation of the instrument horizontal plane from true horizontal along the E-W axis of the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"566892","name":"pitch","description":"

Orientation (pitch) of measurement platform by inclinometer

"}},{"_id":"989099","name":"Roll","format":"","frictionlessType":"number","description":"

Deviation of the instrument horizontal plane from true horizontal along the N-S axis of the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"566894","name":"roll","description":"

Orientation (roll angle) of measurement platform by inclinometer

"}},{"_id":"989100","name":"Pressure","format":"","frictionlessType":"number","description":"

Water pressure in decibar

","units":{"_id":"","name":"dbar"},"type":{"_id":"732","name":"pressure","description":"

water pressure at measurement; depth reported as pressure; positive number increasing with water depth

"}},{"_id":"989101","name":"Temperature","format":"","frictionlessType":"number","description":"

Water temperature in Celsius

","units":{"_id":"","name":"degrees Celsius"},"type":{"_id":"733","name":"temperature","description":"

water temperature at measurement depth

"}},{"_id":"989102","name":"Speed_1","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 0.9 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989103","name":"Dir_1","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 0.9 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989104","name":"Speed_2","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 1.4 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989105","name":"Dir_2","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 1.4 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989106","name":"Speed_3","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 1.9 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989107","name":"Dir_3","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 1.9 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989108","name":"Speed_4","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 2.4 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989109","name":"Dir_4","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 2.4 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989110","name":"Speed_5","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 2.9 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989111","name":"Dir_5","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 2.9 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989112","name":"Speed_6","format":"","frictionlessType":"number","description":"

Current flow velocity in meters per second at 3.4 m above the instrument

","units":{"_id":"","name":"meters per second (m/s)"},"type":{"_id":"794","name":"curr_speed_abs","description":"

absolute current speed, in cm/second. Velocity magnitude.

"}},{"_id":"989113","name":"Dir_6","format":"","frictionlessType":"number","description":"

Current direction in degrees of the compass at 3.4 m above the instrument

","units":{"_id":"","name":"Degrees"},"type":{"_id":"792","name":"curr_dir_abs","description":"

absolute current direction, in degrees

"}},{"_id":"989116","name":"ISO_DateTime_Local","format":"%Y-%m-%dT%H:%M:%S","frictionlessType":"datetime","description":"

Date and time of measurement in EDT

","units":{"_id":"","name":"unitless"},"type":{"_id":"1909","name":"ISO_DateTime_Local","description":"

Date/Time (Local) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\nYYYY-MM-DDTHH:MM:SS[.xx]
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Note the Time Zone (TZ) as +/-HH:MM
\nTime Zone signage is for conversion from local to UTC
\nWest Coast USA in summer is +7 (add 7 hrs to local time for UTC)

"}},{"_id":"989117","name":"ISO_DateTime_UTC","format":"%Y-%m-%dT%H:%M:%SZ","frictionlessType":"datetime","description":"

Date and time of measurement in UTC

","units":{"_id":"","name":"unitless"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Date/Time (UTC) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

"}}],"related_publications":[],"related_datasets":[{"_id":"986662","name":"West Channel currents 2020","url":"","relation_type":"IsRelatedTo","type_desc":"

The dataset is related to another dataset.

\n","relation_desc":"Measurements taken at same study location over multiple years with the Nortek Acoustic Wave And Current Profiler (AWAC).","citation":"Huettel, M., Berg, P. (2025) Structure of current flow in the West Channel in Choctawhatchee Bay, Florida from Mar 29 to Apr 4, 2022. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2025-12-01 doi:10.26008/1912/bco-dmo.986754.1"}],"services":[{"grouping":"","items":[{"name":"View Data","description":"An in-browser view of the primary tabular data file","url":"https://www.bco-dmo.org/dataset/986759/data/view","contentType":"text/html","actionType":"view"}]},{"grouping":"Metadata","items":[{"name":"HTML","description":"A simple HTML page of the dataset metadata","url":"https://www.bco-dmo.org/dataset/986759/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/986759/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/986759/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[],"projects":[{"_id":"895943","name":"Collaborative Research: Megaripples as biocatalytical filters","acronym":"Megaripples","description":"$1c"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.986759.1","url":"https://doi.org/10.26008/1912/bco-dmo.986759.1","date_assigned":"2025-12-03","version_date":"2025-12-01","archiver":"Woods Hole Oceanographic Institution (WHOI BCO-DMO)","archiver_id":"191"}],"license":{"name":"Creative Commons Attribution 4.0","id":"CC-BY-4.0","uri":"https://creativecommons.org/licenses/by/4.0/","spdxUri":"https://spdx.org/licenses/CC-BY-4.0"},"metrics":{"views":{"count":67},"downloads":{"count":153}}},"fileId":"989851"}]