From Physics to Fish: Coupling 3-D Hydrodynamic-Biological ... · HPC, will debut the campus'...
Transcript of From Physics to Fish: Coupling 3-D Hydrodynamic-Biological ... · HPC, will debut the campus'...
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From Physics to Fish: Coupling 3-D Hydrodynamic-Biological Hypoxia
Models with Individual Based Fish Models
Dubravko Justic, Kenneth Rose, Lixia Wang,
Haosheng Huang
Department of Oceanography and Coastal Sciences School of the Coast and Environment
Louisiana State University
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“When there were no computers, computing was not a problem. When we had a few weak computers, computing was a mild problem. Now when we have gigantic computers, computing is a gigantic problem.” E. Dijkstra
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“Shift Happens”
1983 - “Sir Clive Sinclair with his latest innovative computer design” 16 KB RAM
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“Shift Happens”
1983 - “Sir Clive Sinclair with his latest innovative computer design” 16 KB RAM
2011 16 GB RAM
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Beowulf Cluster (Sterling and Becker, 1994)
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September 14, 2009 LSU Launches New Supercomputing Cluster BATON ROUGE, La., Sept. 14 This week, LSU's High Performance Computing, or HPC, will debut the campus' newest supercomputing cluster, Philip….The University purchased Philip for $215,000 in May 2009....
User Friendly and Cheap
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TR
FOt
NP
DO
From 2-Box Models to Mega Models
~106 boxes (Wang and Justic, 2009)
2 boxes (Justic et al., 1996)
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“Conventional” Hypoxia Models 3-D Hydrodynamic model
Water quality model
Motivation Assess ecological effects of large scale hypoxia, i.e., direct and indirect impacts on commercially important fish and shrimp
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Population Displacements
(Craig and Crowder, 2005)
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Objective • Develop models of fish movement
within a 3-D coupled hydrodynamic-biological model framework and derive exposure histories of simulated fish to hypoxia
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“From Physics to Fish”
Wang and Justic, 2009; Justic and Wang, 2009; Justic et al., in preparation
FVCOM-LaTex WASP5
IBM
Individual Processes Movement Growth Mortality Spawning
Conditions Dissolved O2 Temperature Salinity Food density Predator Density Individual Size
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FVCOM-LaTex Computational Domain and Grid
Nodes: 14,740 Elements: 28,320 Resolution: 1-10 km 31 sigma levels
Wang and Justic, 2009
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Model Calibration and Validation • Year 2002 – the largest hypoxic zone
on record (22,000 km2) • Simulation period: April 1 to September
30, 2002; Integration step = 5 s; 4 hours/month on Pelican (32 nodes)
• Initial conditions inferred from transect data and C6 and CSI03 moorings
• Model performance – evaluated using tidal gauges, ADCPs, shipboard measurements, and satellite imagery
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Wang and Justic, 2009
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Wang and Justic, 2009
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WASP5
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Coupled FVCOM-WASP5
Justic and Wang (in preparation)
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Justic and Wang (in preparation)
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Fish IBM Movement Smart Particles = “Smarticles”
Kinesis method (Humston et al., 2004)
• X, Y and Z velocities of each individual are computed based on kinesis behavior (response to DO, T and S)
• Kinesis = sum of random and inertial velocities • When conditions approach preferred state, fish
tend to maintain their previous heading; if environmental conditions are harsh, the directional persistence of fish movement is low, mimicking a random walk
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Applications Deriving exposure histories of simulated fish to Deepwater Horizon oil spill (Justic and Wang, in preparation; Huang et al, in preparation)
NASA Aqua MODIS May 25, 2010
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Challenges in “Physics to Fish” Modeling
• Movement algorithms • Data requirements • Number and locations of monitoring
stations • How many monitoring stations are required
to calibrate a complex “Physics to Fish” model that has 1 million elements?
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“Shift Happens”
1983 - “Sir Clive Sinclair with his latest innovative computer design” 16 KB RAM
2011 16 GB RAM
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Hypoxia models in 2039? Average computer 16 PB RAM (Petabyte) = 1015 Byte
~ 1012 boxes
< 1 m resolution La-Tex shelf
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Microscope-Macroscope Shift "To see these patterns which are bigger than ourselves, let us take a special view through the macroscope.” H.T. Odum (1971)
< 1 m resolution La-Tex shelf
~ 1012 boxes
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G. Müller-Niklas, 1997.
Acknowledgements:
NOAA NGI
NOAA/CSCOR
(NGOMEX)