A systems approach to sedimentation modeling for the twenty first century
Download
1 / 25

A Systems Approach to Sedimentation Modeling for the Twenty-first Century - PowerPoint PPT Presentation


  • 88 Views
  • Uploaded on

A Systems Approach to Sedimentation Modeling for the Twenty-first Century. Timothy R. Keen Oceanography Division Naval Research Laboratory Stennis Space Center, MS 39529. Objective. Discuss the factors affecting a systems approach to sedimentation modeling in coastal areas. Outline.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' A Systems Approach to Sedimentation Modeling for the Twenty-first Century' - glynis


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
A systems approach to sedimentation modeling for the twenty first century

A Systems Approach to Sedimentation Modeling for the Twenty-first Century

Timothy R. Keen

Oceanography Division

Naval Research Laboratory

Stennis Space Center, MS 39529


Objective
Objective Twenty-first Century

Discuss the factors affecting a systems approach to sedimentation modeling in coastal areas.


Outline
Outline Twenty-first Century

  • Overview of sedimentation modeling applications

  • Summarize different structural paradigms for sedimentation modeling

  • Examples of distributed modeling systems

  • Hardware/software/funding trends


Estuarine and marine applications
Estuarine and Marine Applications Twenty-first Century

  • Environmental

  • Coastal engineering

  • Geological

  • Naval


Environmental
Environmental Twenty-first Century

  • 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


Coastal engineering
Coastal Engineering Twenty-first Century

  • Problems

    • Structural design

    • Morphological response

  • Approaches

    • Small-scale models

    • Range of time scales

    • Dependence on measurements


Geological
Geological Twenty-first Century

  • Problems

    • Strata formation

    • Geomorphology

  • Approaches

    • Large time and space scales

    • Parametric models

    • Mixed sediment


Naval
Naval Twenty-first Century

  • Problems

    • Mine Counter Measures

    • Expeditionary warfare

    • Naval Special Warfare

  • Approaches

    • Small time and space scales

    • Forecasting/nowcasting

    • Sensor performance


Comparisons
Comparisons Twenty-first Century

  • 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


Coastal ocean hydrodynamic sedimentation modeling systems paradigms
Coastal Ocean Hydrodynamic-Sedimentation Modeling Systems: Paradigms

  • Tracer

  • Coupled

  • Linked

  • Stand-alone

  • Distributed


Tracer paradigm
Tracer Paradigm Paradigms

  • ADVANTAGES

  • Straightforward implementation

  • Feedback

CHARACTERISTICS

  • Uses hydrodynamic model grid

  • Uses hydrodynamic model mixing.

  • Global variables

  • Single platform

Currents/Waves

+

Sedimentation

  • DISADVANTAGES

  • Inefficient

  • Lack of flexibility

  • Numerics determined by hydrodynamic model


Coupled paradigm
Coupled Paradigm Paradigms

  • ADVANTAGES

  • Straightforward to implement

  • Sedimentation model can be more independent

CHARACTERISTICS

  • Same horizontal grid as hydrodynamic model

  • Time step is relaxed.

  • Vertical resolution can be different.

  • Global and local variables

  • Single platform

Currents/

Waves

Sedimentation

  • DISADVANTAGES

  • Limited Flexibility

  • Some numerics determined by hydrodynamic model

  • Limited Feedback


Linked paradigm
Linked Paradigm Paradigms

  • 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

Currents/

Waves

Sedimentation

  • DISADVANTAGES

  • Limited Flexibility

  • No Feedback


Stand alone paradigm
Stand-Alone Paradigm Paradigms

  • ADVANTAGES

  • Easy to implement

  • Flexibility

  • Efficient

CHARACTERISTICS

  • Sedimentation model is independent

  • All forcing fields interpolated

  • Sedimentation model physics/numerics separate

  • Local variables

  • Multiple platforms

Currents

Waves

  • DISADVANTAGES

  • Input processing

  • No Feedback

Sedimentation


Distributed paradigm
Distributed Paradigm Paradigms

  • ADVANTAGES

  • Flexibility

  • Feedback

  • Straightforward modification

  • Scalability

CHARACTERISTICS

  • Sedimentation model is independent

  • All forcing fields interpolated

  • Sedimentation model physics/numerics separate

  • Local/global variables

  • Multiple platforms

Server

Currents

Waves

  • DISADVANTAGES

  • Input/Output processing

  • Difficult to implement

Sedimentation


Distributed system examples
Distributed System Examples Paradigms

  • Distributed Marine Environmental Forecast System (DMEFS)

  • High Fidelity Simulation Of Littoral Environments (HFSOLE)


Dmefs
DMEFS Paradigms

  • 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


Dmefs1
DMEFS Paradigms

  • 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


Dmefs summary
DMEFS Summary Paradigms

  • Seamless access via a standard web browser.

  • User friendly

  • Easy dissemination of results

  • Brings powerful computational and database resources to user’s fingertips


High fidelity simulation of littoral environments hfsole
High Fidelity Simulation of Littoral Environments (HFSOLE) Paradigms

Goal: Couple technologies that model the key phenomena governing the complex littoral environment


Approach
Approach Paradigms

  • Improve scalable nearshore models

  • Link scalable CWO models

  • Implement distributed capabilities on scalable DoD HPC platforms


Hfsole components
HFSOLE: Components Paradigms

  • 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)


Trends
Trends Paradigms

  • 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


Conclusions
Conclusions Paradigms

  • 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.


Acknowledgements
Acknowledgements Paradigms

This work was sponsored by the Office of Naval Research and the Department of Defense High Performance Computing Modernization Office.


ad