Rockhampton current climate 100 year average recurrence interval wind hazard  

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Unknown

Abstract

This use of this data should be carried out with the knowledge of the contained metadata and with reference to the associated report provided by Geoscience Australia with this data (Reforming Planning Processes Trial: Rockhampton 2050). A copy of this report is available from the the Geoscience Australia website (http://www.ga.gov.au/sales) or the Geoscience Australia sales office (sales@ga.gov.au, 1800 800 173). The wind hazard outputs are a series of rasters, one for each average recurrence interval considered, presenting peak wind hazard (peak from all directions) as measured in km/h.

Product Type

dataset

eCat Id

77353

Contact for the resource

Keywords

• GIS Dataset

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_Internal

Publication Date

2013-08-21T00:00:00

Creation Date

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Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - restricted

Use - license

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Purpose

Maintenance Information

notPlanned

Topic Category

geoscientificInformation

Series Information

Lineage

Extracted and summarised from the report below. Review the report for the full text and the figures and references mentioned. The full text is also attached to the data; view via ArcCatalog. The wind hazard raster data is a product of the combination of regional wind hazard, resulting from the Tropical Cyclone Risk Model (TCRM), and the wind speed multipliers. The Tropical Cyclone Risk Model The hazard assessment uses Geoscience Australia's statistical-parametric TCRM. The TCRM generates a synthetic catalogue of 5000 years of events that are statistically similar to the input dataset, e.g. a set of observed historical storms. TCRM then calculates a parametric wind field around each track to determine the swath of winds from each event in the synthetic catalogue. The resulting wind fields were ranked and an extreme value distribution fitting procedure applied to determine ARI wind speeds. Data The Australian Bureau of Meteorology's best-track dataset, for seasons 1981-2005 (Kuleshov et al., 2008) was used as the input dataset. This is a quality controlled, homogenised catalogue of Tropical Cyclone (TC) observations of date, time, position and intensity (measured as estimated central pressure). This dataset does impart a slight bias, due to the high proportion of El Nino events over the 25-year period. Tropical cyclone activity in the eastern Australian region is generally decreased under El Nino conditions, and this may result in a slight underestimation of wind hazard (this period was relatively quiescent compared to the entire 20th Century). However the actual value should be within the upper and lower 90% confidence estimates indicated in Figure 12 and Figure 13. Wind multipliers The model incorporates the effects of the land surface on the wind through so-called site-exposure multipliers. The site-exposure multipliers combine effects of topography, land cover (e.g. forests, croplands, urban areas and water bodies) and the shielding effects provided by closely-spaced buildings. The wind multipliers are location specific values that convert the regional return wind speed (Figure 14) into local wind speed estimates at building height. The combined wind multiplier raster is developed from the combination of four multiplier rasters: - the wind direction multiplier (cyclonic winds all directions = 0.95) - the terrain/height multiplier (land use classification considering surface roughness) - the shielding multiplier (upwind shielding from buildings) - the topographic multiplier (hill slope). When the combined site-exposure multiplier raster is applied to the regional (ARI) wind speed raster, nine rasters were produced: eight cardinal directions and the ninth being a maximum wind speed captured from the other eight. The maximum wind speed raster for each ARI considered has been provided in the results and the wind hazard map sheets.

Parent Information

Extents

[-23.8424, -22.9405, 149.9427, 150.9882]

Reference System

Spatial Resolution

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