sodar Articles

  • Verification of wind energy related measurements with a SODAR system

    Abstract Complex terrain and growing wind energy converters (WEC) in wind parks generate increasing interest in determining wind profiles and turbulence besides the general forecast of annual energy production. Increasing hub heights and growing rotor diameters of advanced WEC make SODAR systems a valuable alternative to meteorological towers. SODAR systems provide wind profiles as well as ...

  • Verification of SBL models by mobile SODAR measurements

    Models of atmospheric pollutant transport need information about the structure of the atmospheric boundary layer (ABL). The most important characteristics for such applications are the parameterisation of the stable boundary layer (SBL) and the mixing layer height (MLH). Recently, many different schemes have been employed to calculate the SBL height, but there are many problems with applying ...


    By Inderscience Publishers

  • A brief statement of airport applications for doppler SODAR systems

    Doppler SODAR Operating similar to a sonar the Doppler SODAR (Sonic Detection and Ranging) directly measures the atmospheric wind speed and direction at multiple altitudes simultaneously. These systems utilize the Doppler effect imposed on the received acoustic signal echoed by the atmosphere for the wind measurements. The Doppler effect is the common observation that the acoustic signal ...

  • Further development of the French-German dispersion model - SODAR pre-processor

    Basic concepts, technical applications and details of the updated meteorological pre-processor using SODAR data (MPS) as well as additional meteorological measurements are presented. The pre-processor allows the calculation of boundary-layer parameters, i.e. friction velocity, Monin-Obukhov length and mixing layer height, on the basis of SODAR measurements which serve as input parameters for ...


    By Inderscience Publishers

  • On wind velocity profiles over urban area

    The horizontally homogeneous atmospheric boundary layer over rough surface with a large roughness length z0 is introduced to model the simplest cases of the Urban Planetary Boundary Layer (UABL) over the flat plain. The system of the equations of motion was non-dimensionalised and it has been demonstrated that the Rossby number similarity exists for the core of the UABL. That means that the ...


    By Inderscience Publishers

  • Field measurements within a quarter of a city including a street canyon to produce a validation data set

    Air pollutants and meteorological parameters were measured continuously by in situ instruments, path-averaging techniques (up to three DOAS systems), and SODAR inside a street canyon and in the surrounding area of 1 km x 1 km (Gottinger Strasse in Hanover, Germany) from 2001 until 2003 which are available in the data bank ValiData for validation of microscale models. During three IOPs tracer ...


    By Inderscience Publishers

  • Effects of meteorological data thresholding on the quality of urban HPAC predictions of the Joint Urban 2003 field trials

    Comparisons of field trial observations with predictions created by the US Defense Threat Reduction Agency's Hazard Prediction and Assessment Capability (HPAC) represent an ongoing effort. Intuitively, one might prefer to include meteorological inputs as close to the release location as possible. During Joint Urban 2003, SODARs measured vertical wind profiles?upwind, within the city centre near ...


    By Inderscience Publishers

  • Experimental study of turbulence and vertical temperature profile in the urban boundary layer

    We observed the turbulence and vertical profile of temperature in and above the roughness sublayer (RS) using a tower, a tethered balloon and a Doppler sodar in Himeji City. A 3–D ultrasonic anemometer–thermometer was sited at a height of 54 m on the tower. The present results showed that in the RS, the ratio of friction velocity to wind speed, u* /u, observed under unstable ...


    By Inderscience Publishers

  • Diurnal variation of the mixing-layer height and polonium concentration in the air

    The Mixing Height (MH) is one of the most important parameters that characterise the range of the atmospheric turbulence. This parameter shows characteristic diurnal variation but cannot be measured immediately. Therefore, it is evaluated indirectly by measuring other quantities. The measurement of radon concentration in the atmospheric air is one of the methods using natural occurring ...


    By Inderscience Publishers

  • Modelling different meteorological situations in Catalunya, Spain, with MM5 and TAPM mesoscale models: a comparative study

    Meteorological simulations have been performed with two different mesoscale models: MM5 (PSU/NCAR-USA) and TAPM (CSIRO-Australia). Both models have been run under two different meteorological situations, typical for summertime and wintertime, allowing the models to be tested under different synoptic forcings. The study region for these mesoscale simulations is located in the interior of ...


    By Inderscience Publishers

  • Zasavje canyon regional online air pollution modelling system in highly complex terrain - description and validation

    Zasavje is an industrial region in Slovenia located along the Sava River's steep canyon where PM10 air pollution is a major problem. In the paper a national project with the title 'Prognostic and diagnostic integrated regional air pollution modelling system' is described where it is shown that such a project can significantly contribute to the proper understanding of air pollution in smaller ...


    By Inderscience Publishers

  • The impact of landfills on the air quality of towns: a simple heuristic model for the city of Palermo

    In this study, the landfill of Palermo, is investigated as a potential source of the unusual methane concentrations found in the urban context. The source for these pollution episodes is identified by means of a simple heuristic method. A cross-correlation analysis between wind data and methane concentration levels is also used to confirm the hypotheses formulated. Doppler Sound Detection And ...


    By Inderscience Publishers

  • Short–term fine resolution WRF forecast data validation in complex terrain in Slovenia

    For the air pollution modelling studies over highly complex terrain, vertical wind profiles are essential. In the article we present evaluation about using the WRF model as the source of wind profile information. We tested WRF's one day short–term forecasts at 4 km and half hour resolution running every day to obtain 3D meteorological fields and compared these data with the different ...


    By Inderscience Publishers

  • ADMS 5 Buildings & Complex Terrain Validation Martins Creek Steam Electric Station

    1 Introduction The Martins Creek Steam Electric Station1 [1] is located in a rural area along the Delaware River on the Pennsylvania/New Jersey border, approximately 30 km north-east of Allentown, PA and 95 km north of Philadelphia, PA. The area can be characterised by complex terrain rising above the stacks. Sources included multiple tall stacks ranging from 122 to 183 ...

  • On the application of miniSoDAR technology to wind energy

    Introduction In the late 1990’s wind turbines with nacelle heights exceeding 60 meters were introduced to the wind energy community. Initially, wind prospecting and siting studies continued to use 50-meter wind towers and extrapolate the measurement to the nacelle heights. It was quickly determined that this approach was not sufficient for the placement of these tall turbines. The next ...

  • miniSODAR

    The miniSODAR is a high-frequency Doppler sodar system that was designed to measure the atmospheric wind profile from 15 meters to 150/200 meters (data is often available to 250 meters) in 5-meter increments. It operates by generating a short tone burst (30 ms to 100 ms) in the frequency range of 4 kHz to 6 kHz. It monitors the low-level acoustic signal echoed by the atmosphere. The echo is ...

  • A 2-D meteorological pre-processor for real-time 3-D ATD models

    Horizontal non-uniformity has important effects on the structure of the atmospheric boundary layer and, consequently, on pollutant transport and dispersion. These effects can be dominant in coastal sites or in the presence of complex terrain. Advanced 3-D atmospheric dispersion models can be used to calculate short-term pollutant concentrations in such complex situations. The use of new ...


    By Inderscience Publishers

  • CU-Boulder leading study of wind turbine wakes

    While wind turbines primarily are a source of renewable energy, they also produce wakes of invisible ripples that can affect the atmosphere and influence wind turbines downstream -- an issue being researched in a newly launched study led by the University of Colorado Boulder's Julie Lundquist, assistant professor in the atmospheric and oceanic sciences department. The study, called the Turbine ...


  • New methods for measuring the wind

    Although computer models of wind flow over terrain have improved dramatically in the past few years, there is still no substitute for data recorded at the site. So you want to build a wind farm. Good for you. With the global drive towards a low carbon economy, it is surely the right way to go for many individuals, companies and, indeed, Governments around the world. As information from the ...


  • Amassing Wind Information

    Wind is a variable resource, but not an indecipherable one. Second Wind encourages harnessing the full range of wind sensing technologies that are available today. When it comes to wind information, much attention is focused on the choice of wind measurement technology and data collection practices in wind resource assessment and project design. Right now, wind data plays a limited role in the ...


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