second sc5 pilot: identifying the release location of a substance

SECOND SC5 PILOTIDENTIFYING THE RELEASE LOCATIONRELEASE LOCATION OF A SUBSTANCE

NCSR Demokritos20 December 2016

ContentContent

Environment contamination The Chernobyl plumey p The Algeciras plume Th F k hi l The Fukushima plume Problem definition Leveraging BDE Issues to be explored Issues to be explored

www.big-data-europe.eu

Environment contaminationEnvironment contamination


DepositionDeposition

Wet deposition

Dry deposition


FactorsFactors

Climate and weather are important factors affecting accident consequences

In the absence of rain dry deposition takes placeo radioactive particles settle under the influence of o radioactive particles settle under the influence of

gravity, wind and turbulence

Snow and rain result Snow and rain result in wet deposition

S Source: http://www.irsn.fr/EN/publications/thematic/fukushima/Documents/IRSN_Fukushima-Environment-consequences_28022012.pdf

The Chernobyl plumeThe Chernobyl plume

At 01:23 on 26/4/1986 a severe accident took place at Chernobyl-4 nuclear power plant

Atmospheric dispersion models were applied to the 137Cs atmospheric release po The meteorological conditions in Europe following the

accident were reconstructedacc de we e eco s uc ed

Source: http://www.irsn.fr/EN/publications/thematic-safety/chernobyl/Pages/The-Chernobyl-Plume.aspxwww.big-data-europe.eu

Source: http://www.europarl.europa.eu/news/en/news-room/20140514STO47018/forsmark-how-sweden-alerted-the-world-about-the-danger-of-chernobyl-disaster


Source: http://www.europarl.europa.eu/news/en/news-room/20140514STO47018/forsmark-how-sweden-alerted-the-world-about-the-danger-of-chernobyl-disasterwww.big-data-europe.eu

The Algeciras plumeThe Algeciras plume

HYSPLIT simulation of 137Cs dispersion between 0 and 500m altitude every 3 hours over a 3-day period.

Source: http://www-dase.cea.fr/public/dossiers_thematiques/modelisation_et_simulation_du_transport_atmospherique/description_en.html

p y y pIt is presumed that the source (red dot) emits 100 Bq between 00:00 and 03:00 on May 30, 1998.


The Fukushima plumeThe Fukushima plume

At 14:46 on 11/3/2011 the Tohoku-Chihou-Taiheiyo-Oki earthquake rocked Fukushima Daiichi nuclear power station

An hour later a tsunami invaded the site Hydrogen explosions

E l ti di th F k hi D ii hi Explanations regarding the Fukushima Daiichi accident consequences on the environment appear

h // i f /EN/ bli i / h iat: http://www.irsn.fr/EN/publications/thematic-safety/fukushima/Pages/2-fukushima-understanding-environment.aspx


Issue at handIssue at hand

Release of a hazardous substance in the atmosphere

Support the decision making process for countermeasure takingg

Estimation of consequences on:h manso humans

o environment


Problem statementProblem statement

Identify the release location of a substance Available information:

o Measurements of the substance level at certain locations

o Current weather conditionso Past weather conditionso Past weather conditions


Current approachesCurrent approaches

Computational approach:o work backwards – inverse modelling – from the current

atmospheric conditions to estimate source location

Long computation times required, especially for g p q , p ycomplex caseso complicated topography o complicated topography o weather conditions


Leveraging BDELeveraging BDE

Use BDE to manage:o A large number of pre-computed dispersion datao Historical atmospheric conditions

In this manner: In this manner:o The computationally hardest part is pre-computed

M t hi t t h i diti t th o Matching current atmospheric conditions to the pre-computed cases formulates a smaller problem


The computational essenceThe computational essence

Match current weather against a database of historical atmospheric conditions by:o Building upon the NetCDF data management and

searching tools created during the first SC5 piloto Encoding weather patterns onto mapsWeather similarity map/image similarity

o Developing operators that search consecutive hourly slices for similar weather


Open issuesOpen issues

Open issues to be investigated during the pilot implementation:o What exactly does “similar enough weather” mean for

this pilot purposes?o What volumes need to be pre-computed to always

have in the database “similar enough weather”?o Are these volumes manageable and searchable?


Questions?Questions?

BigDataEurope Web site:https://www.big-data-europe.eu

Thank you for your attention!


second sc5 pilot: identifying the release location of a substance

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