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NT Remote Communities Storm Tide Study and Inundation Mapping



NT Remote Communities Storm Tide Study and Inundation Mapping


Systems Engineering Australia Pty Ltd

Issued by

Northern Territory. Department of Land Resource Management


E-Publications; E-Books; PublicationNT; J1507-PR001B




Made available via the Publications (Legal Deposit) Act 2004 (NT).; 'This report documents tropical cyclone (TC) storm tide hazard analyses that will provide the basis for reliable risk analyses of major remote towns and indigenous communities on the West Coast, Arnhem Land and Tiwi Islands.' - Introduction


This Storm Surge Study Report was produced with funding provided by the Northern Territory and Australian Governments through the Natural Disaster Resilience Program. 'Numerical Modelling and Risk Assessment' - on cover.; Made available via the Publications (Legal Deposit) Act 2004 (NT).

Table of contents

Executive summary -- Introduction -- The study localities -- Methodology to assess the storm tide hazard -- Simulation model results -- Conclusion -- References -- List of Appendices A-C.




Storm surges; Storm surges; Cyclones; Maps; Mathematical models

Publisher name

Northern Territory Government

Place of publication





vi, 62, 4,3,8 pages : colour illustrations, colour maps ; 30 cm.

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Parent handle


Citation address


Page content

NT Department of Land Resource Management NT Remote Communities Storm Tide Study and Inundation Mapping J1507-PR001B 27 Systems Engineering Australia Pty Ltd July 2016 The mean 10-min (V600) winds are in blue and 3-sec peak gusts (V3) are red, although the peak gust is only available daily and the time during the day was not available. This shows that the modelled and measured mean winds are in close agreement but the modelled gust appears lower than measured. The MSL pressures are also close but offset slightly. Section 3.8.2 presents examples of the modelled storm tide from these events. TC Lam (2015) crossed the coastline between Maningrida and Milingimbi. As an alternate demonstration of the parametric modelling capability applied in this Study, Appendix C provides examples of the SEAtide modelling of this event, which compares well to the qualitative BoM post-event survey. 3.3.2 Probabilistic Comparisons Long-term measured wind data has been used to test the statistical reliability of the resulting modelled TC wind climate This is a most challenging aspect of the process and relies on the availability of such data, which is typically sparse and limited in the tropics. Only Darwin and Gove in this region have sufficient data length and quality to be of use for this purpose Figure 3-7 shows how the 10,000 y of simulated TC winds match the BoM-measured long-term TC wind data9 at Darwin and Gove, based on events where a TC was within 300 km of each site. The TC model here generates the mean wind (blue), which has been factored by recommended gust factors (Harper et al. 2010) to represent the peak gust (red) in order to allow comparison with the available measured data. TC Tracy is the peak gust outlier in the Darwin record. The graphs show wind speeds that have been terrain adjusted to Terrain Category 2 (Tcat2) according to Standards Australia (2012). 9 HC refers to 3 h synoptic winds; HM to 30 min and DC to daily peak. The BoM 3-sec gust has been converted to the AS/NZS1170.2 0.2-sec equivalent in this comparison.