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Pulp Friction Pilot Marjo Hippi Finnish Meteorological institute

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

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  1. Final Seminar 10-11 June 2010 Brussels Belgium Pulp FrictionPilotMarjo HippiFinnish Meteorological institute

  2. 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

  3. 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

  4. Road weather classification Classification by Finnish Transport Agency ROADIDEA Final Seminar @ Brussels, 10-11 June, 2010

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. Thank YouPulp Friction teamMarjo HippiIlkka JugaPertti Nurmi

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