A Decision Support Tool for Highway Maintenance: A First Principle Thermal Mapping Model & Edward E....

A Decision Support Tool for Highway Maintenance:A Decision Support Tool for Highway Maintenance:

A First Principle Thermal Mapping ModelA First Principle Thermal Mapping Model

& & Edward E. AdamsEdward E. Adams

WTI / MSU Bozeman, MTWTI / MSU Bozeman, MT

Allen R. CurranAllen R. CurranThermoAnalytics Inc. Calumet, MIThermoAnalytics Inc. Calumet, MI

Sponsored by Montana Department of Transportation Sponsored by Montana Department of Transportation

by Peter Gauerby Peter Gauer

Western Transportation Institute

Montana State University-Bozeman

PotentialPotential BenefitsBenefits

• Information for Maintenance DecisionsInformation for Maintenance Decisions• De-Icing De-Icing • Anti-IcingAnti-Icing

• Information for PublicInformation for Public• Freeze WarningFreeze Warning• Road Weather ConditionsRoad Weather Conditions



Basic PhysicsBasic Physics

• Surface Heat BudgetSurface Heat Budget

- G (1 - G (1 - ) )

- LL + L + L+ HH+ LELE

- QQGG

= 00



Model ChainModel Chain

ETA (40 km)

Meteorological Input Data• Radiation (downward)• Wind Speed• Air Temperature• Relative Humidity• Precipitation Rate



I-90 Bozeman Pass (Test Area)I-90 Bozeman Pass (Test Area)

MBZHMELV



Meso-Scale Model I (Bozeman Area)Meso-Scale Model I (Bozeman Area)

Simulation were made using ARPS developed by the Center of Prediction and Analysis of Storms

[m/s]

M

Wind field simulation for Bozeman Area 19/11/2000 19:00 UTC

Meso-Scale Model II (MBZH)Meso-Scale Model II (MBZH)

Comparison between Simulation and Measurements: 05/12/2000-05/14/2000

G[W/m2]

Ta

[C]

M

[m/s]

L[W/m2]



WinTherm I (I-90 Rocky Canyon)WinTherm I (I-90 Rocky Canyon)

Thermal Map

Period05/06/2000 06:00 MDT05/08/2000 14:00 MDT

Surface Temperature Tsfc

Color Coded in C

Temperature at MM319



WinTherm II (I-90 MM319)WinTherm II (I-90 MM319)

Comparison between 2 Simulations and Measurements

Tsfc

[C]



WinTherm III (I-90 MM319)WinTherm III (I-90 MM319)

Comparison between Simulation and Measurements

Tsfc

[C]



Concluding RemarksConcluding Remarks

• A successful implementation of the A successful implementation of the thermal model chain can be a useful thermal model chain can be a useful tactical decision support tool for winter tactical decision support tool for winter highway management. highway management.

• Coupled with a snowpack model, it can Coupled with a snowpack model, it can also be a tool to predicted snowpack also be a tool to predicted snowpack stability and to forecast avalanche stability and to forecast avalanche hazard threatening highway sections.hazard threatening highway sections.



What need to be done further?What need to be done further?

• Meteo-Model Meteo-Model (Improvement of the (Improvement of the Meteorological Input Data for Wintherm)Meteorological Input Data for Wintherm)::

• Cloud Cover Modeling Cloud Cover Modeling Radiation Radiation

• Nesting:Nesting:

• Grid Resolution Grid Resolution

• Number Nesting StepsNumber Nesting Steps

• Thermal MappingThermal Mapping

• Grid ResolutionGrid Resolution

• Adaptive Meshing for Critical AreasAdaptive Meshing for Critical Areas

• Influence of Surface PropertiesInfluence of Surface Properties

• Albedo for Snow/Ice Covered PavementsAlbedo for Snow/Ice Covered Pavements

• Melting, Icing, Sublimation, CondensationMelting, Icing, Sublimation, Condensation

• etc. etc.

A Decision Support Tool for Highway Maintenance: A First Principle Thermal Mapping Model & Edward E....

Documents

Transcript of A Decision Support Tool for Highway Maintenance: A First Principle Thermal Mapping Model & Edward E....