NT Remote Communities Storm Tide Study and Inundation Mapping
Systems Engineering Australia Pty Ltd
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).
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
Northern Territory Government
vi, 62, 4,3,8 pages : colour illustrations, colour maps ; 30 cm.
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
NT Department of Land Resource Management NT Remote Communities Storm Tide Study and Inundation Mapping J1507-PR001B 14 Systems Engineering Australia Pty Ltd July 2016 The estimated tidal range is 2.4 m, with present HAT at 1.1 m AHD. The entire community appears to sit above 10 m AHD. Although generally protected from the Timor Sea, there is geomorphic evidence of prograding sand ridges just to the south of the town that indicates storm tide related impacts from the Arafura Sea might be prominent, possibly aided by refraction around the smaller nearby islands. On a larger scale the region presents an opportunity for focusing of a storm tide impact between Croker Island and the Mountnorris Bay feature to the south and east, with constriction provided by Bowen Strait. The adjacent coastal seas are relatively shallow, being generally less than 25 m and together these factors likely make the region to the south at least somewhat susceptible to storm tide impacts. Breaking wave setup at Minjilang could become significant during some close approach TC events. Warruwi (11.65S 133.39E) This small indigenous community of about 500 residents5 is located on the south-eastern side of South Goulburn Island (refer Figure 2-6). The nearby southern tip of the island is separated from the mainland by the narrow (2 km) Macquarie Strait. The town has an airstrip and barge services. The estimated tidal range is 3.0 m, with present HAT at 1.3 m AHD. The majority of the town is lower than 10 m AHD, with the coastal strip settled down to 3 to 4 m AHD. Although seemingly protected from the Arafura Sea to the north, there is geomorphic evidence of prograding sand ridges just north of the town that indicates storm tide related impacts have probably emanated from the east-south-east and have been focused by the coastal features. The close proximity of South Goulburn Island to the mainland likely facilitates a constriction with the adjacent coastal seas being relatively shallow (generally less than 25 m). These factors likely make the region susceptible to storm tide impacts. Breaking wave setup at Warruwi could be significant during some TC events. 2.4 East Arnhem Coast Maningrida (12.05S 134.23E) This indigenous community is located at the mouth of the expansive Liverpool River estuary (refer Figure 2-7) and has a population of around 2300 persons6. 5 http://westarnhem.nt.gov.au/warruwi/ 6 http://westarnhem.nt.gov.au/maningrida/ http://westarnhem.nt.gov.au/warruwi/ http://westarnhem.nt.gov.au/maningrida/