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Cohabitation between wind farms and weather radars in France

Abstract : Météo-France operates a network of 39 weather radars located in metropolitan France and overseas territories. The network is composed of radar operating at C, S and X band, most of the metropolitan radars are now polarimetric, and have a detection range of to 280 kms. Weather radars are designed to measure volumetric quantities such as the radar reflectivity (Z 3 ) that can be related to the precipitation intensity but also the Doppler velocity that is the radial component of the wind estimated from the displacements of the target contained in the radar volume volume (hydrometeors, aerosol, insects , etc.) These radars are subject to false echoes in the presence of wind turbines (WT 5 ) in their coverage area that lead to overestimations of the reflectivity and false wind measurements that induce in turn large errors and false alarms on downstream products (eg.QPE) and weather application (analyzes, forecasts, alerts, etc.) that use radar observations as input. To limit these false echoes, MF is forced to blacklist the contaminated data when it is detected, but in the best case scenario that means replacing overestimations by underestimations (linked to the loss of data). Since 2011, French regulations protect weather radar wind turbines located within 30 km of transmitters, but impacts can be observed beyond (80km). In this communication, the impacts on Météo France products will be illustrated and discussed and the methodology used to identify the false echoes will be presented. Météo-France will be also very interested to learn of technical progress or research activity in the field of impact modelling, signal processing and source reduction (RCS 6 ) that can help mitigate the impacts observed on weather radar products. 1 - MF :Météo-France 2 - CMR : Centre de Météorologie Radar 3 - Z : factor of reflectivity : https://en.wikipedia.org/wiki/DBZ_(meteorology) 4 - QPE : Quantitative Precipitation Estimation 5 - WT : Wind Turbine 6 - RCS : Radar Cross Section
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Conference papers
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https://hal.archives-ouvertes.fr/hal-02476041
Contributor : Rémi Douvenot <>
Submitted on : Wednesday, February 12, 2020 - 2:29:46 PM
Last modification on : Tuesday, March 24, 2020 - 11:10:01 AM

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  • HAL Id : hal-02476041, version 1

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Richard Lorandel. Cohabitation between wind farms and weather radars in France. Specialist Meeting on Electromagnetic Waves and Wind Turbines (EMWT2019), Dec 2019, Toulouse, France. ⟨hal-02476041⟩

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