Data

Darwin Harbour Habitat Mapping Program: Current velocity (50th and 75th percentile)

Australian Ocean Data Network
Williams, D. ; Brinkman, R.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/127193&rft.title=Darwin Harbour Habitat Mapping Program: Current velocity (50th and 75th percentile)&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/127193&rft.description=This resource contains current velocity grids (50th and 75th percentile) for the greater Darwin Harbour region as part of a baseline seabed mapping program of Darwin Harbour and Bynoe Harbour. This project was funded through offset funds provided by an INPEX-led Ichthys LNG Project to the Northern Territory Government’s Department of Environment and Natural Resources (NTG-DENR) with co-investment from Geoscience Australia (GA) and the Australian Institute of Marine Science (AIMS). The intent of this program is to improve knowledge of the marine environments in the Darwin and Bynoe Harbour regions by collating and collecting baseline data that enable the creation of thematic habitat maps and information to underpin marine resource management decisions. The current velocity grids (50th and 75th percentile) were derived from a compilation of multiple surveys undertaken by GA, AIMS and NTG-DENR between 2011 and 2017, including GA0333 (Siwabessy et al., 2015), GA0341 (Siwabessy et al., 2015), GA0351/SOL6187 (Siwabessy et al., 2016), GA4452/SOL6432 (Siwabessy et al., 2017), GA0356 (Radke et al., 2017), and GA0358 and GA0359 (Radke et al., 2018), adding to those from previous surveys GA4425 and GA0333 collected by GA, AIMS, NTG-DENR and Darwin Port Authority.Maintenance and Update Frequency: asNeededStatement: A numerical model of the broader study region was established using the RMA-2 hydrodynamic modelling software to simulate tidal currents and water levels. RMA-2 is a two-dimensional depth averaged finite element hydrodynamic numerical model (King 2016). It computes water surface elevations and horizontal velocity components for subcritical, free-surface two-dimensional flow fields. RMA-2 computes a finite element solution of the Reynolds and Navier-Stokes equations for turbulent flows, solving the depth-integrated equations of fluid mass and momentum conservation in two horizontal directions. Friction is calculated with the Manning’s or Chezy equation, and eddy viscosity coefficients are used to define turbulence characteristics. The underpinning bathymetry for the model grid was derived from a 10 m bathymetric survey grid compiled from both previously reported (e.g. digitised nautical charts) and new survey data. The model was run for a 30 day period to capture a characteristic spring-neap tidal cycle. At each model element, tidal velocities were calculated and analysed to provide maps of tidal velocity percentiles and accompanying percentiles of tidal bed shear stress.&rft.creator=Williams, D. &rft.creator=Brinkman, R. &rft.date=2019&rft.coverage=westlimit=130.25; southlimit=-12.77; eastlimit=131; northlimit=-12.1; projection=WGS 84 / UTM zone 52S (EPSG:32752)&rft.coverage=westlimit=130.25; southlimit=-12.77; eastlimit=131; northlimit=-12.1; projection=WGS 84 / UTM zone 52S (EPSG:32752)&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=Hydrodynamic&rft_subject=Marine Environmental Baselines&rft_subject=Marine Survey&rft_subject=Exclusive Economic Zone&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
Cite Saved to MyRDA Save to MyRDA

Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

4.0

http://creativecommons.org/licenses/

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

Access:

Open

Contact Information

clientservices@ga.gov.au

Brief description

This resource contains current velocity grids (50th and 75th percentile) for the greater Darwin Harbour region as part of a baseline seabed mapping program of Darwin Harbour and Bynoe Harbour. This project was funded through offset funds provided by an INPEX-led Ichthys LNG Project to the Northern Territory Government’s Department of Environment and Natural Resources (NTG-DENR) with co-investment from Geoscience Australia (GA) and the Australian Institute of Marine Science (AIMS). The intent of this program is to improve knowledge of the marine environments in the Darwin and Bynoe Harbour regions by collating and collecting baseline data that enable the creation of thematic habitat maps and information to underpin marine resource management decisions. The current velocity grids (50th and 75th percentile) were derived from a compilation of multiple surveys undertaken by GA, AIMS and NTG-DENR between 2011 and 2017, including GA0333 (Siwabessy et al., 2015), GA0341 (Siwabessy et al., 2015), GA0351/SOL6187 (Siwabessy et al., 2016), GA4452/SOL6432 (Siwabessy et al., 2017), GA0356 (Radke et al., 2017), and GA0358 and GA0359 (Radke et al., 2018), adding to those from previous surveys GA4425 and GA0333 collected by GA, AIMS, NTG-DENR and Darwin Port Authority.

Lineage

Maintenance and Update Frequency: asNeeded
Statement: A numerical model of the broader study region was established using the RMA-2 hydrodynamic modelling software to simulate tidal currents and water levels. RMA-2 is a two-dimensional depth averaged finite element hydrodynamic numerical model (King 2016). It computes water surface elevations and horizontal velocity components for subcritical, free-surface two-dimensional flow fields. RMA-2 computes a finite element solution of the Reynolds and Navier-Stokes equations for turbulent flows, solving the depth-integrated equations of fluid mass and momentum conservation in two horizontal directions. Friction is calculated with the Manning’s or Chezy equation, and eddy viscosity coefficients are used to define turbulence characteristics. The underpinning bathymetry for the model grid was derived from a 10 m bathymetric survey grid compiled from both previously reported (e.g. digitised nautical charts) and new survey data. The model was run for a 30 day period to capture a characteristic spring-neap tidal cycle. At each model element, tidal velocities were calculated and analysed to provide maps of tidal velocity percentiles and accompanying percentiles of tidal bed shear stress.

Issued: 15 01 2020

Data time period: 2011 to 2017

This dataset is part of a larger collection

Click to explore relationships graph
Help

Related Data

Related Organisations

Related People

Related Services

131,-12.1 131,-12.77 130.25,-12.77 130.25,-12.1 131,-12.1

130.625,-12.435

text: westlimit=130.25; southlimit=-12.77; eastlimit=131; northlimit=-12.1; projection=WGS 84 / UTM zone 52S (EPSG:32752)

Subjects
Exclusive Economic Zone | Hydrodynamic | Marine Environmental Baselines | Marine Survey | Published_External | geoscientificInformation |

User Contributed Tags    

Login to tag this record with meaningful keywords to make it easier to discover

Other Information
Download the data (esri grid) [8.5 MB]

uri : https://d28rz98at9flks.cloudfront.net/127193/127193_00_0.zip

Link to collection record

uri : https://pid.geoscience.gov.au/dataset/ga/127494

Identifiers
Similar data you may be interested in: