Dataset TITLE
Time-average tide kinetic energy density on the Australian Continental Shelf

Dataset AUTHORS
M.G. Hughes

Dataset CUSTODIAN
Geoscience Australia

Dataset JURISDICTION
Australia

Description ABSTRACT
This data set provides calculated estimates of the time-averaged tide kinetic energy density that occurs on the Australian shelf (J/m^3; i.e. not depth-integrated). The calculated energy is based on a linearised shallow water model that includes parameterised corrections for dissipation, tidal loading and ocean-shelf attraction (Porter-Smith et al., 2004). The model-predicted data set consists of the sine and cosine coefficients of the east and north components of the tide velocity vector associated with the 4 principal diurnal and semi-diurnal harmonic constituents (M2, S2, K1, and O1). These were used to produce a year long, hourly time series of the depth-averaged tidal current vectors on a 0.1 degree spatial grid. Velocity vector time series were converted to kinetic energy density using linear wave theory. The estimated time-average tide kinetic energy density was obtained by averaging the energy density record over a year. The data are discussed in Geoscience Australia and ABARE (2010).

Description SEARCH WORDS(S)
GEOSCIENCES Oceanography MARINE Tide energy

Description GEOGRAPHIC EXTENT POLYGON
AEEZ – AUS - Australia

Description GEOGRAPHIC EXTENT BOUNDARIES

*West longitude: 110

*East longitude: 156

*North latitude: -7

*South latitude: -46

Description GEOGRAPHIC EXTENT NAME(S)
National

Description NOMINAL SCALE
Scale 1[M1] : 

Dataset Currency BEGINNING DATE
1MARCH2010[M2]

Dataset Currency ENDING DATE
Current

Dataset Status PROGRESS
Complete

Dataset Status MAINTENANCE AND UPDATE FREQUENCY
As required

Access STORED DATA FORMAT 
ESRI Shape file - Geographic WGS84[M3]

Access AVAILABLE FORMAT TYPE(S)
ESRI Shape file - Geographic WGS84

Access ACCESS CONSTRAINT
No restrictions

Data Quality LINEAGE
The data set was produced in 2009 as part of a joint program by Geoscience Australia and the Australian Bureau of Agricultural and Resource Economics to deliver an energy resource assessment for Australia to the Department of Resources, Energy and Tourism. The spatial coverage of this marine data set is clipped to the area between the Australian coastline and the edge of the continental shelf (water depth of 300 m); which is the zone where there is likely to be most interest in exploiting marine renewable energy resources. The information presented in this data set is based entirely on numerical model outputs.

Data Quality POSITIONAL ACCURACCY
Due to the spatial grid (0.1 degree) the smallest attribute feature that can be resolved is greater than approximately 10 sq km.

Data Quality ATTRIBUTE ACCURACY
No attribute data quality across the entire domain exists at this stage.

Data Quality LOGICAL CONSISTENCY[M4]

Data Quality COMPLETENESS
The spatial coverage is 100% of the Australian continental shelf from the coastline out to the 300 m isobath at a 0.1 degree resolution.

Contact Information CONTACT ORGANISATION
Geoscience Australia

Contact Information CONTACT POSITION
GA Sales Centre

Contact Information MAIL ADDRESS 1
GPO Box 378

Contact Information SUBURB OR PLACE OR LOCALITY
Canberra City

Contact Information STATE
ACT

Contact Information COUNTRY
Australia

Contact Information POSTCODE
2601

Contact Information TELEPHONE
612 6249  9111

Contact Information FACSIMILE
612 6249  9999

Contact Information ELECTRONIC MAIL ADDRESS
Sales@ga.gov.au

Metadata Date METADATA DATE
4 June 2010

COORDINATE SYSTEM DESCRIPTION
Projection           GEOGRAPHIC
Datum                WGS84
Units                DD

ADDITIONAL METADATA
Attribute Units………….J/m^3

REFERENCES
Geoscience Australia and ABARE, 2010. Australian Energy Resource Assessment. Canberra.

Porter-Smith, R., Harris, P.T., Andersen, O.B., Coleman, R., Greenslade, D., and Jenkins, C.J., 2004. Classification of the Australian continental shelf based on predicted sediment threshold exceedence from tidal currents and swell waves. Marine Geology, 211, 1-20.
[M1]Doesn’t this depend on what size it is printed at? More for physical products than electronic data I would have thought. 
[M2]Does the date have to be in that format? I just used the date of the AERA report.
[M3]WGS84 is correct, and I am assuming you are publishing the data as ESRI shape files.
[M4]Do I delete this if it is not populated?
