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UID:pretalx-foss4g-2024-VK8CVW@talks.staging.osgeo.org
DTSTART;TZID=-03:20241206T150000
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DESCRIPTION:Flooding caused by rainfall poses a significant hazard to Pacif
 ic Island nations that are at risk of cyclones and large rainfall events. 
 Particularly\, island nations such as Samoa\, which are characterised by h
 igh mountains and steep river gullies\, are highly susceptible to flash fl
 ooding events. Despite this recognised threat\, a notable absence of relia
 ble\, high-quality data hinders the application of traditional hydrodynami
 c models that typically rely on precise river flow values and often disreg
 ard rainfall factors. Furthermore\, there is an absence of flood hazard in
 undation maps that can provide a basic indication and outline the potentia
 l consequences of rainfall-induced flooding on both the populace and the e
 nvironment within these regions.\n\nTo address these challenges\, the Paci
 fic Risk Tools for Resilience Phase-2 (PARTneR-2) project\, co-led by the 
 New Zealand National Institute of Water and Atmospheric Research (NIWA) an
 d the Pacific Community (SPC)\, has introduced a novel approach to rapid r
 ain-on-grid modelling. This methodology uses a combination of open-source 
 geo-spatial software\, including QGIS\, RAS Mapper\, and 2D hydrodynamics 
 software BG-Flood\, on limited geo-spatial data to rapidly produce indicat
 ive flood depth inundation maps.\n\nOur study has concentrated on two Paci
 fic Island nations: Samoa and Vanuatu. For these two countries\, we have d
 eveloped a series of flood depth inundation maps at national coverage for 
 10-\, 50-\, and 100-year Annual Recurrence Intervals (ARI). The model used
  to produce the maps requires limited input data\, is reasonably easy to s
 et up\, and can be run in under 12 hours. The maps produced are useful in 
 providing a basic indication of areas that are at the most risk of floodin
 g in a specified rainfall event. The method is cost-effective and can be i
 mplemented using entirely open-source software.\n\nFurthermore\, by integr
 ating the flood maps produced by this study with geo-spatial asset data se
 ts\, particularly focusing on buildings\, our study shows how we can quant
 ify the exposure and potential losses to flooding events\, employing the R
 iskscape multi-hazard risk modelling software. The outcomes generated by t
 his innovative method offer valuable insights that can inform resource all
 ocation decisions during the critical hours following a significant rainfa
 ll event\, particularly in the context of a Post Disaster Needs Assessment
  (PDNA) study.
DTSTAMP:20260518T231014Z
LOCATION:Room II
SUMMARY:Enhancing Resilience to Pluvial Flooding in Pacific Island Nations:
  A Novel Approach to Rapid Rainfall Modelling and Risk Assessment. - James
  Battersby
URL:https://talks.staging.osgeo.org/foss4g-2024/talk/VK8CVW/
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