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METEOROLOGICAL MEASUREMENTS IN THE ATMOSPHERIC BOUNDARY LAYER E. Dupont – D. Demengel – Y. Lefranc

METEOROLOGICAL MEASUREMENTS IN THE ATMOSPHERIC BOUNDARY LAYER E. Dupont – D. Demengel – Y. Lefranc. Activity integrated in CEREA since 2005 Outline - Objectives - Focus on sodars campaign - Tests of a UHF radar - Collaboration with IPSL. OBJECTIVES.

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METEOROLOGICAL MEASUREMENTS IN THE ATMOSPHERIC BOUNDARY LAYER E. Dupont – D. Demengel – Y. Lefranc

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  1. METEOROLOGICAL MEASUREMENTSIN THE ATMOSPHERIC BOUNDARY LAYERE. Dupont – D. Demengel – Y. Lefranc Activity integrated in CEREA since 2005 Outline - Objectives - Focus on sodars campaign - Tests of a UHF radar - Collaboration with IPSL

  2. OBJECTIVES • To propose solutions for the needs of EDF in the fields of : • Atmospheric dispersion at an industrial or urban site • Wind energy resource • Interaction acoustic propagation / meteorology • Tests of instruments and development of methodologies: • For nuclear power plants : safety rule, dispersion of effluents in routine or accidental conditions • Wind turbine parks : reduction of uncertainty on wind resource estimation • Constitution of data bases for validation of numerical models (Mercure_Saturne) and simulations on complex terrain • Participation to cooperative field experiments (ESCOMPTE, PARIS-FOG during next winter …) • Primarily wind and turbulence measurements • In-situ and remote sensing : sodar, UHF radar

  3. SODARS INTERCOMPARISON • Main goal : evaluation of the availability and the quality of measurements provided by several commercialised mini-sodars, and their acoustic disturbance • Do they fulfil the conditions to be used on the nuclear power plants (currently used sodars have to be changed) ? • Do they fulfil the specific needs of wind energy applications ? • Flat and homogeneous site (in Beauce) – December 2005 to February 2006 • Very few such inter-comparisons of phased array sodars are reported in the litterature • European project WISE (WInd energy Sodar Evaluation) : underline advantages of sodars for wind energy applications but also many drawbacks: • No or bad measurements of strong winds, no or bad measurements in rainy situations, necessity of data filter and calibration …

  4. INSTRUMENTAL SET-UP Remtech PA2 Remtech PA0 78 m height mast Sonic and cup anemometers Scintec SFAS AéroVironment AV4000

  5. Application to wind energy resource estimation: • Test of a methodology to determine wind speed at hub height (about 80 m for current turbines), with a 40 m height mast during one year and a 2 months sodar campaign • Use of normalized profiles of wind speed averaged by direction sectors • Computation of wind speed at 80 m during one year and comparison with anemometer measurement  bias divided by 3 compared to an extrapolation with a power law • To be tested on a complex terrain ! CONCLUSIONS: • Measurements between 30 m and 200 m to 300 m • Problems of measurements in very windy or rainy situations can be overcame with hardware and software adaptations • For some sodars, very good results are found for the comparison with sonic anemometers, without any user data filter • For this data set, calibration against cup anemometer was not useful • Sodars can probably allow a reduction of error on the estimation of wind turbines electric production

  6. TESTS OF A UHF RADAR • Collaboration with Laboratoire d’Aérologie (Lannemezan) (PhD of Vincent Puygrenier) and the manufacturer Degréane • Objectives : • Improvment of the quality of measurements below 200 m AGL • Development of methodologies for estimation of turbulent variables • Application to ABL studies (especially during ESCOMPTE campaign) • Campaign of 2005 (August-November): • Test of important modifications performed by Degréane on the transmitter and the receiver • Comparison with sodar Remtech PA2 and Metek sonic anemometer • Results show significant improvment of the quality of data at the first level (85 m)

  7. Comparison Degréane UHF radar / Remtech PA2 sodar(collaboration with Laboratoire d’Aérologie - Lannemezan) 85 m level: Bias < 0,5 m/s / 5° Precision ~ 1 m/s / 30°

  8. Turbulence measurements with UHF radar • Direct comparison between spectral width on the vertical beam given by UHF radar and standard deviation of vertical velocity given by sodar 8h – 16h TU all data

  9. Collaboration with Institut Pierre Simon Laplace • Instruments of EDF-R&D/CEREA are going to be installed before the end of 2006 on the experimental site of IPSL (SIRTA, Ecole Polytechnique, suburbs of Paris) • This will contribute to a very well instrumented site (in-situ + teledetection) for research on meteorology and air quality. Supported by Ile de France region. • Two main projects for the next years • Simulation of the ABL heterogeneities induced by the land use on this complex site (trees, buildings, water …) • Long-term comparison between Mercure_Saturne code and measurements (wind, turbulence, radiative fluxes, temperature and humidity) with different modes of simulation and grids (COMPERES project) • PARIS-FOG : Observation and numerical simulation of the fog (Météo-France/IPSL/CEREA) • Campaign between november 2006 and march 2007 • 1D and 3D simulations of turbulent, radiative, dynamical and microphysical processes involved in the life cycle of the fog

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