Operational Drift Forecast Modelling in support of AMSA MH370 Search
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1 Operational Drift Forecast Modelling in support of AMSA MH370 Search Ben Brushett, Sasha Zigic, Ryan Alexander, David Wright, Murray Burling 1
2 Overview of Presentation Introduction of the incident and drift planning working group SARMAP and the COASTMAP EDS Ocean currents in the search area based on three different ocean forecast models (BLUElink, HYCOM NCEP and HYCOM Navy) Best practice consensus forecasting using all three ocean models Comparisons using SLDMB drifters to assess each of the ocean model s performance throughout the incident 2
3 Background Malaysian Airlines flight MH370 went missing on the 8 th of March 2014 whilst en route from Kuala Lumpur, Malaysia to Beijing, China The Australian Maritime Safety Authority (AMSA) AMSA became involved in the drift planning once the search area became focussed on waters within the Australian SRR Due to the difficulties in the scenario, AMSA established a drift planning working group to ensure international best practice was carried out in this complex incident 3
4 The Drift Planning Working Group Members of the drift planning working group included specialists from several organisations including:» AMSA RCC» CSIRO» RPS APASA» BoM» GEMS» US Coast Guard 4
5 Drift Planning Working Group Ensure international best practice techniques and consensus drift modelling was applied to the incident Supplement standard RCC drift planning as not practical to apply usual procedures due to length of time, objects adrift and large initial splash-point areas Discussion around the taxonomy of targets for aviation debris objects as no specific leeway data available 5
6 SARMAP and the COASTMAP EDS Drift modelling software SARMAP» Lagrangian particle trajectory model» Uses large number of particles to simulate the potential trajectories and dispersion of SAR objects» Ocean current forecasts and wind forecasts from the COASTMAP EDS are used to provide environmental forcing to the model» Rather than focussing on any single ocean forecast use as many forecast models as are available 6
7 BLUElink 7
8 HYCOM (NCEP) 8
9 HYCOM (Navy) 9
10 Three Models Combined 10
11 Consensus Forecasting Best Practice Consensus forecasting was carried out to:» Account for more variability than any single ocean model could represent» Provide higher likelihood zones where multiple forecasts overlapped 11
12 Consensus Drift Area 12
13 Combined Particle Density Drift Area 13
14 Animation of Drift Area 52 Days 14
15 SLDMB model verification Used to ground truth the known complex oceanic currents SLDMBs to assist in determination of best data set Deploy in advance of proposed move of search area Image courtesy of AMSA 33 x SLDMB s successfully deployed to validate drift modelling Comparisons run against all three oceanic current data sets to provide information as to the highest performing data set 15
16 SLDMB model verification 30 March to 14 April 16
17 SLDMB model verification 30 March to 6 April 17
18 SLDMB model verification 30 March to 14 April 18
19 SLDMB model verification 30 March to 14 April 19
20 Summary Complex environment, very complex scenario Best practice combined and consensus forecasting was applied to consider more variability than any one single model could represent Consensus forecasting was used to present numerous different outcomes and determine where these coincided Model performance was evaluated throughout the incident, using SLDMB drifters Comparisons using SLDMB drifters allow for a model skill assessment to be built up over time Skill assessment may allow for potential weighting of the consensus forecast to improve results further investigations required 20
21 Thank You Thank you for your attention throughout this presentation 21
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