Territory Stories

NT Remote Communities Storm Tide Study and Inundation Mapping

Details:

Title

NT Remote Communities Storm Tide Study and Inundation Mapping

Creator

Systems Engineering Australia Pty Ltd

Issued by

Northern Territory. Department of Land Resource Management

Collection

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

Date

2016-07-01

Description

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

Notes

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.

Language

English

Subject

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

Publisher name

Northern Territory Government

Place of publication

Palmerston

Series

J1507-PR001B

Format

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

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/267238

Citation address

https://hdl.handle.net/10070/443309

Page content

NT Department of Land Resource Management NT Remote Communities Storm Tide Study and Inundation Mapping J1507-PR001B 22 Systems Engineering Australia Pty Ltd July 2016 3.2 Tropical Cyclone Wind and Pressure Modelling The Harper and Holland (1999) model, as further detailed in Harper (2001) forms the base reference for the adopted wind and pressure modelling of a mature tropical cyclone. The model relies on a series of parameters to describe a TC when it is over an open ocean environment, namely: the central Mean Sea Level (MSL) pressure p0; the surrounding, or ambient, pressure pn; the radius to maximum winds R; the wind field peakedness factor B; the storm track (speed Vfm and direction fm). The model then generates estimates of the 10-minute average wind speed and direction (V600) at a height of 10 m above the ocean surface for supply to the hydrodynamic models for storm surge and waves. The MSL pressure is also supplied to the hydrodynamic model as it has an influence on the generation of the storm surge. Figure 3-3 sourced from SEA (2005) shows an example crossection of winds and pressures and the resulting surface wind pattern generated for a moving TC. This approach has been extended to include the Double Holland concept as implemented by McConochie et al. (2004) for the Queensland region. This has advantages over a single model by ensuring that peak winds can be better represented and that winds more remote from the centre will also be more realistic. This requires: a secondary vortex pressure deficit p2; a secondary vortex radius R2; a secondary vortex peakedness factor B2 The advantages of this approach are that it is able to accommodate a greater range of wind profiles to better represent natural storms and the Double Holland structural vortex relationships are also utilised by the synthetic climate model to ensure climatological matching. 3.3 Verification of the TC Model against Wind and Pressure Data The modelling of the TC climate and the surface wind and pressure forcing from individual TCs has been variously verified against independent measured wind and pressure data to provide confidence in its use.