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Comments on "Estimation of tropical cyclone wind hazard for Darwin: Comparison with two other locations and the Australian wind-loading code"


Harper, BA and Holmes, JD and Kepert, JD and Mason, LB and Vickery, PJ, Comments on "Estimation of tropical cyclone wind hazard for Darwin: Comparison with two other locations and the Australian wind-loading code", Journal of Applied Meteorology and Climatology, 51, (1) pp. 161-171. ISSN 1558-8424 (2012) [Refereed Article]

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Copyright Statement

Copyright 2012 American Meteorological Society

DOI: doi:10.1175/JAMC-D-10-05011.1


Cook and Nicholls recently argued in this journal that the city of Darwin (Northern Territory), Australia, should be located in wind regionDrather than in the current region C in theAustralian/New Zealand Standard AS/NZS 1170.2 wind actions standard, in which region D has significantly higher risk. These comments critically examine the methods used by Cook and Nicholls and find serious flaws in them, sufficient to invalidate their conclusions. Specific flaws include 1) invalid assumptions in their analysis method, including that cyclones are assumed to be at the maximum intensity along their entire path across the sampling circle even after they have crossed extensive land areas; 2) a lack of verification that the simulated cyclone tracks are consistent with the known climatological data and in particular that the annual rate of simulated cyclones at each station greatly exceeds the numbers recorded for the entire Australian region; and 3) the apparent omission of key cyclones when comparing the risk at Darwin with two other locations. It is shown here that the number of cyclones that have affected Port Hedland (Western Australia), a site in Australia's region D, greatly exceeds the number that have influenced Darwin over the same period for any chosen threshold of intensity. Analysis of the recorded gusts from anemometers at Port Hedland and Darwin that is presented here further supports this result. On the basis of this evidence, the authors conclude that Darwin's tropical cyclone wind risk is adequately described by its current location in region C.

Item Details

Item Type:Refereed Article
Keywords:Australia, hurricanes, risk assessment, tropical cyclones
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Maritime engineering not elsewhere classified
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Weather
UTAS Author:Mason, LB (Mr Luciano Mason)
ID Code:80388
Year Published:2012
Web of Science® Times Cited:3
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2012-10-31
Last Modified:2018-01-18

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