A Systems Approach to Sedimentation Modeling for the Twenty-first Century
description
Transcript of A Systems Approach to Sedimentation Modeling for the Twenty-first Century
![Page 1: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/1.jpg)
A Systems Approach to Sedimentation Modeling
for the Twenty-first Century
Timothy R. KeenOceanography Division
Naval Research Laboratory Stennis Space Center, MS 39529
![Page 2: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/2.jpg)
Objective
Discuss the factors affecting a systems approach to sedimentation modeling in coastal areas.
![Page 3: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/3.jpg)
Outline
• Overview of sedimentation modeling applications
• Summarize different structural paradigms for sedimentation modeling
• Examples of distributed modeling systems
• Hardware/software/funding trends
![Page 4: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/4.jpg)
Estuarine and Marine Applications
• Environmental• Coastal engineering• Geological• Naval
![Page 5: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/5.jpg)
Environmental
• Problems– Sediment-water nutrient
exchange– Pore water and solid
phase chemistry– Dredging-related releases
• Approaches– Bed models– Water quality sub-models– Fine grained sediment
processes
![Page 6: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/6.jpg)
Coastal Engineering
• Problems– Structural design– Morphological response
• Approaches– Small-scale models– Range of time scales– Dependence on
measurements
![Page 7: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/7.jpg)
Geological
• Problems– Strata formation– Geomorphology
• Approaches– Large time and
space scales– Parametric models– Mixed sediment
![Page 8: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/8.jpg)
Naval
• Problems– Mine Counter Measures– Expeditionary warfare– Naval Special Warfare
• Approaches– Small time and space
scales– Forecasting/nowcasting– Sensor performance
![Page 9: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/9.jpg)
Comparisons
• Similarities– All need hydrodynamic forcing.– All need to calculate the quantity of
sediment being entrained and/or transported.
• Differences– They differ in time and spatial scales.– Different input/output requirements
![Page 10: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/10.jpg)
Coastal Ocean Hydrodynamic-Sedimentation Modeling
Systems: Paradigms
• Tracer• Coupled• Linked• Stand-alone• Distributed
![Page 11: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/11.jpg)
Tracer Paradigm
CHARACTERISTICS
• Uses hydrodynamic model grid
• Uses hydrodynamic model mixing.
• Global variables• Single platform
ADVANTAGES• Straightforward implementation• Feedback
DISADVANTAGES• Inefficient• Lack of flexibility• Numerics determined by hydrodynamic
model
Currents/Waves+
Sedimentation
![Page 12: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/12.jpg)
Coupled Paradigm
CHARACTERISTICS• Same horizontal grid
as hydrodynamic model
• Time step is relaxed.• Vertical resolution
can be different.• Global and local
variables• Single platform
ADVANTAGES• Straightforward to implement • Sedimentation model can be more
independent
DISADVANTAGES• Limited Flexibility • Some numerics determined by hydrodynamic
model• Limited Feedback
Currents/Waves
Sedimentation
![Page 13: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/13.jpg)
Linked Paradigm
CHARACTERISTICS• Same horizontal grid
as hydrodynamic model
• Time constraint is relaxed.
• Vertical resolution can be different.
• Local variables• Multiple platforms
ADVANTAGES• Straightforward to implement • Models do not run concurrently • Efficient
DISADVANTAGES• Limited Flexibility• No Feedback
Sedimentation
Currents/Waves
![Page 14: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/14.jpg)
Stand-Alone Paradigm
CHARACTERISTICS• Sedimentation
model is independent
• All forcing fields interpolated
• Sedimentation model physics/numerics separate
• Local variables• Multiple platforms
ADVANTAGES• Easy to implement • Flexibility• Efficient
DISADVANTAGES• Input processing• No Feedback
CurrentsWaves
Sedimentation
![Page 15: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/15.jpg)
Distributed Paradigm
CHARACTERISTICS• Sedimentation model
is independent• All forcing fields
interpolated• Sedimentation model
physics/numerics separate
• Local/global variables• Multiple platforms
ADVANTAGES• Flexibility• Feedback• Straightforward
modification• Scalability
DISADVANTAGES• Input/Output
processing• Difficult to implement
ServerCurrents
Waves
Sedimentation
![Page 16: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/16.jpg)
Distributed System Examples
• Distributed Marine Environmental Forecast System (DMEFS)
• High Fidelity Simulation Of Littoral Environments (HFSOLE)
![Page 17: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/17.jpg)
DMEFS
• Research test bed: demonstrate the integration of various technologies and components prior to DoD operational use
• Open framework: operate climate, weather, and ocean (CWO) models.
• Prototype system: couple atmosphere and ocean models into a distributed hindcast/nowcast/forecast system
![Page 18: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/18.jpg)
DMEFS
• DMEFS is an application and an infrastructure
– A collection of METOC models, applications, utilities, and services
– A software infrastructure comprised of a user front end, middleware, and interfaces to back end processors
![Page 19: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/19.jpg)
DMEFS Summary
• Seamless access via a standard web browser.
• User friendly• Easy dissemination of results• Brings powerful computational and
database resources to user’s fingertips
![Page 20: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/20.jpg)
High Fidelity Simulation of High Fidelity Simulation of Littoral Environments Littoral Environments
(HFSOLE)(HFSOLE)Goal: Couple Goal: Couple technologies that technologies that model the key model the key phenomena phenomena governing the governing the complex littoral complex littoral environmentenvironment
![Page 21: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/21.jpg)
ApproachApproach
• Improve scalable nearshore modelsImprove scalable nearshore models• Link scalable CWO modelsLink scalable CWO models• Implement distributed capabilities on scalable Implement distributed capabilities on scalable
DoD HPC platformsDoD HPC platforms
![Page 22: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/22.jpg)
HFSOLE: Components
• Wind: COAMPS (FNMOC)• Waves: WAM, SWAN, STWAVE• Currents: ADCIRC, NCOM, HYCOM• Rivers: Adaptive Hydraulics Code (ADH)• Sedimentation: LSOM• Model integration framework:
Common Object Request Broker Architecture (CORBA)
![Page 23: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/23.jpg)
Trends
• Hardware, algorithms, and software– Scalable computers– Shared memory/message passing– Global computational grid development– Software Upgrading: e.g., Common High
performance computing Software Support Initiative (CHSSI)
• Funding for distributed modeling systems– ONR: Naval Battlespace Awareness (S&T Grand
Challenge)– NSF: Information Technology Research (ITR) for
Geosciences
![Page 24: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/24.jpg)
Conclusions
• The common denominator for the different sedimentation modeling applications is not the model itself but the need to make efficient use of results.
• Preliminary technology issues have been addressed.
• Now is the time to develop a sedimentation modeling system that allows flexibility and ease of use.
![Page 25: A Systems Approach to Sedimentation Modeling for the Twenty-first Century](https://reader035.fdocuments.in/reader035/viewer/2022062806/56814ee6550346895dbc77e2/html5/thumbnails/25.jpg)
Acknowledgements
This work was sponsored by the Office of Naval Research and the Department of Defense High Performance Computing Modernization Office.