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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 58 Systems Engineering Australia Pty Ltd July 2016 5. Conclusion This report documents a comprehensive future climate tropical cyclone storm tide study for the identified major remote towns and indigenous communities along the NT West Coast, Tiwi Islands and Arnhem Coast. It follows the recommended methodology set out in the Scoping Study (GHD-SEA 2015) and includes an allowance for projected climate change impacts by the Year 2100. The approach represents an enhancement over earlier regional studies by utilising a synthetic TC climatology trained on historical datasets rather than a purely sampled historical data climatology. Increased spatial resolution has been added to the earlier models in the vicinity of each community. The statistical simulation utilises newly-developed parametric versions of the hydrodynamic models but in a manner similar to the earlier studies. The results indicate that the low-lying community of Milingimbi has the greatest exposure to storm tide hazard, followed by Warruwi, Milikapiti and Minjilang. While Wadeye is located in a region having a very high storm tide response, its elevation provides community protection. Wurrumiyanga is in part protected by its relatively high tidal range, while Pirlangimpi, Maningrida and Galiwinku communities have the advantage of significant elevation. It should be noted that the present Study considers only the effects of tropical cyclones on coastal water levels and that other extreme weather events (e.g. seasonal monsoons) can create small storm surge events that influence water levels on broader and more frequent timescales. In many locations this can mean that a water level similar to or greater than the HAT level is commonly achieved in association with periods of high spring tides (aka king tides). In the Return Period context, TC-only water levels are then less likely than the other minor weather effects at short Return Periods. This often means that water levels will therefore be dominated by non-TC events below the 100 y Return Period The results of this storm tide hazard study can be used for assessing the need for long term mitigation planning to ensure safety and sustainability for each community.