Seabed exposure grid of Carnarvon Shelf  

Authors / CoAuthors

Hughes, M.

Abstract

The ArcINFO grid is one of the outputs of a finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999).The grid describes the modelled maximum orbital velocity (m/s) which can be used as estimation of seabed exposure on the Carnarvon Shelf.

Product Type

dataset

eCat Id

72030

Contact for the resource

Keywords

• Marine DataBathymetry Grid

( Theme )

• abiotic surrogates

( Theme )

• numerical modelling

( Theme )

• marine

( Theme )

• CERF

• AU-WA

Australian and New Zealand Standard Research Classification (ANZSRC)

• Marine Geoscience

• Published_External

Publication Date

2011-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

asNeeded

Topic Category

geoscientificInformation

Series Information

Lineage

A finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999), was developed to estimate seabed disturbance for Carnarvon Shelf. The SWAN model estimates wave propagation using the wave action equation (Hasselmann et al., 1973). The model takes into account refraction of swell waves, plus shoaling, diffraction, dissipation and random waves, but excludes local wave generation by wind. The bathymetry data for the SWAN model was input at 100metre spatial resolution. The model also required three parameters: significant wave height (2 to 4 metres), peak wave period (6 to 14 seconds), and peak wave direction (?p, 220 degree). The model generated five variables (in a plain text file) for each scenario: significant wave height, wave direction, orbital velocity, orbital diameter and maximum orbital velocity. The maximum orbital velocity (unit: m/s) was considered as the best estimate of seabed exposure. The values of maximum orbital velocity were then combined to generate one seabed exposure variable: averaging all 12 scenarios (cs_all_av). This seabed exposure variable was then transformed intoArcINFO grids.

Parent Information

Extents

[-24.13, -21.49, 112.93, 114.33]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

File download  

Source Information

CERF Marine Biodiversity Hub