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Final Seminar 10-11 June 2010 Brussels Belgium. Pulp Friction Pilot Marjo Hippi Finnish Meteorological institute. Vaisala DSC111. Idea. Snow and ice may exist almost 6 months a year on Finnish road network Increased traffic incident risk

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Pulp friction pilot marjo hippi finnish meteorological institute l.jpg

Final Seminar

10-11 June 2010

Brussels

Belgium

Pulp FrictionPilotMarjo HippiFinnish Meteorological institute


Slide2 l.jpg

Vaisala DSC111

Idea

  • Snow and ice may exist almost 6 months a year on Finnish road network

    • Increased traffic incident risk

  • Develop a statisticalforecast model for road surface friction based on friction measurements made by Vaisala DSC111 instrument

  • Develop a forecast tool for meteorologists and road maintenance personnel

  • Product(s) for drivers

ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


Fmi s road weather model l.jpg

Upper boundary forcing

  • Atmosphere

  • wind speed (Vz)

  • air temperature and humidity (Ta , Rh)

  • global (short wave) radiation (RS)

  • incoming long wave radiation (RL)

  • precipitation (P)

  • Traffic

  • mechanical wear, heating

FMI’s road weather model

  • Turbulence

  • natural

  • traffic induced

  • Surface heat exchange

  • sensible heat flux (H)

  • latent heat flux (LE)

  • long wave radiation (RL)

  • stability

  • Ground heat transfer

  • heat conductivity ()

  • specific heat (c)

  • density ()

  • porosity ()

ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


Road weather classification l.jpg
Road weather classification

Classification by Finnish Transport Agency

ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


Observed friction vs snow ice and water on the surface l.jpg
Observed friction vs. snow+ice and water on the surface

Anjala observations, winter 2007-2008

a)

b)

Observed friction with ice and/or snow on the surface

(water content in mm)

Observed friction with water on the surface.

ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


How does the friction model work l.jpg

Simulation

  • Input data

  • Depth of ice/snow/water

  • Road surface temperature

  • Output data

  • Friction

FMI's road

weather model

run

How does the friction model work?

All input data is available from FMI road weather model

  • Friction formulas included into the road weather model

ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


Implementation l.jpg
Implementation

  • Google.maps application presents 3-hour forecast of expected road weather

    • Temperature

    • Friction

    • Road condition

  • Produced in collaboration between FMI, Destia and Demis

  • http://pilot.roadidea.eu/friction/

    • Also, a mobile phone application available

    • Information of road weather (including friction), roadside photographs, warnings given by other users

    • Produced in collaboration between FMI, Destia and Logica

    ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


    Validation results l.jpg
    Validation results

    • Modeled vs. observed road surface friction when snow/ice on the surface

    • Correlation 0.86

    More Pulp Friction validation and evaluation results in WP8 presentation by Stephanie Müller

    Utti 2009/2010

    ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


    More results l.jpg

    Modeled

    Observed

    Modeled

    Modeled

    Observed

    Modeled

    More results

    • Model simulates cases of poor friction well, but…

    • Model produces typically too low friction values for a too long time

      • The road weather model has too big storages for ice

      • The road weather model lacks information about road maintenance actions  Necessary input data for a well-functioning model !

    ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


    Conclusions and future l.jpg
    Conclusions and future

    • Friction model is a new, innovative product

    • Results are not quite as good as expected, but the shortcomings are realized

    • Further development, testing and evaluation is an ongoing process

      Guidelines

    • Define station specific relationships at all computation points

    • Investigate a probabilistic approach to friction/slipperiness forecasting

    ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010


    Thank you pulp friction team marjo hippi ilkka juga pertti nurmi l.jpg

    Thank YouPulp Friction teamMarjo HippiIlkka JugaPertti Nurmi


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