Authors / CoAuthors
Williams, D. | Brinkman, R.
Abstract
This resource contains wave derived orbital velocity magnitude at seabed grids (0°, 90°, 140°, 270° and 315°) 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 wave derived orbital velocity magnitude at seabed grids (0°, 90°, 140°, 270° and 315°) 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.
Product Type
dataset
eCat Id
127207
Contact for the resource
Point of contact for the resource
Point of contact
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- Hydrodynamic
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- Marine Environmental Baselines
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- Marine Survey
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- Exclusive Economic Zone
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- Published_External
Publication Date
2020-01-15T03:50:15
Creation Date
Security Constraints
Legal Constraints
Status
completed
Purpose
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
Wave propagation within Beagle Gulf, Darwin and Bynoe Harbours was modelled with the SWAN shallow water wave model (Ris et al.1999). SWAN is a third generation spectral model that contains implicit shallow water routines to allow for shoaling, frictional dissipation, wave breaking and refraction. The model grid was a regular, rectilinear mesh with 100m spatial resolution, with bathymetry at model grid points interpolated from a 10m bathymetric survey grid compiled from both previously reported (e.g. digitised nautical charts) and new survey data. Surface wave simulations were performed with wind forcing of at 10 m/s from directions of 0, 90, 140, 270 and 315 degrees. From these, grids of wave-derived bed orbital velocity and wave bed shear stress were calculated.
Parent Information
Extents
[-12.77, -12.1, 130.25, 131]
Reference System
WGS 84 / UTM zone 52S (EPSG:32752)
Spatial Resolution
100m
Service Information
Associations
Source Information