Atlantic Post-Tropical Cyclone GONZALO Forecast/Advisory Number 30
Cyclone PAM Post Inundation Assessment Survey...
Transcript of Cyclone PAM Post Inundation Assessment Survey...
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Cyclone PAM
Post Inundation Assessment
Survey using UAV
Herve Damlamian, Cyprien Bosserelle,
Amrit Raj, Zulfikar Begg, Jens Kruger.
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Tropical Cyclone PAM
Tuvalu:• AU$ ~14M
• 25% of TV 2013 GDP
• 41% population affected
• 90% damage on crops in 3 Islands,
30% damage on crops in 4 Islands
Vanuatu:• 16 death
• 65,000 people displaced
• >50% population affected (166,000)
• 17,000 buildings affected
• AU$ ~619M – Damage and Loss
• 64.1% of GDP
• Livelihood of more than 80% of
rural population affected.
Other countries affected: New
Caledonia, Solomon Island,
Kiribati, New-Zealand.
Preliminary Wave model of Cyclone Pam
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Post Disaster Assessment
Survey
• Rapid Damage Assessment
– Collect high resolution images to assess
building damage.
• Extreme Wave Inundation and Impact Assessment
– Collect Inundation data from an extreme wave
event.
– Assess use of UAV for Post disaster inundation
impact assessment.
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Post PAM Inundation Assessment
3D Shoreline Mapping
• Generate high resolution Topography of coastal areas:
– Setting up temporary tide gauge.
– Setting up Bench Marks in Targeted areas.
– Using RTK GPS System to Establish GCPs.
– UAV mapping with 90% overlap
• Compare with LIDAR data (2012)
Methodology
Preliminary Wave model of Cyclone Pam, Efate
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Point Cloud: Takara Village, NE Efate
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Inundation Extent and Run-up
240m Inundation extent
7m run-up (Above TGZ)
Debris line
Debris line
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3D Shoreline Change
• ORTHOPHOTO
• DTM
Prior Cyclone
PAMLIDAR DATA (2012)
After Cyclone
PAMUAV DATA (2015)
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Example: Map of Change
Takara Village, NE Efate
UAV limitation in dense vegetation
Erosion
Accretion
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Erosion
AccretionOnesua
Epike
Epau
Paonagisu
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Common Shoreline Pattern
2015 Beach profile
2012 Beach profile
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Emerged Holocene Reef Terrace
2015 Beach profile
2012 Beach profile
Erosion
Accretion
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Erosion
Accretion
2015 Beach profile
2012 Beach profile
Before CycloneAfter Cyclone
Spurs and Grooves
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Impact Exacerbated
by Human Activity
Prior Cyclone
PAMLIDAR DATA
(2012)
After Cyclone
PAMUAV DATA (2015)
Erosion (Red) / Accretion (Blue)
Cross
Section
Erosion
Accretion
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Conclusion:
• This study highlights the benefit of using UAV for post inundation survey.– One dataset: Inundation extent, Run-up, coastal changes (m3)
– Identified Shoreline Change Pattern vs Geomorphology:• River (present or Ancient)
• Salient
• Uplifted Holocene reef terrace
• Uniform sandy beach
- Improve our understanding on extreme wave inundation and coastal impact on fringing reef.
- Improve future inundation risk assessment study, inundation and impact forecast work.
• Combined with Tide Gauge and RTK system, UAV + photogrammetrytechnology has proven to be a credible alternative to LIDAR forTopography data collection. However there are limitations… (DSM toDTM conversion, processing time,…).
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Vinaka
and
special
thanks to
Ministry
of Land,
Vanuatu