Estimation of flux parameters from sodar wind profiles

Wind Energy Assessment of the Sidi Daoud Wind Farm - Tunisia

“…The modeling of the vertical profile of the wind speed in the measurement place mast 4 by the power and logarithmic laws, in order to know the evolution the wind speed at altitudes representing an energy interest [22][23][24][25][26][27]. A close attention is paid to the study of the influence height on the wind characteristics (mean speed and power density) by using the Rayleigh distribution.…”

“…The standard height of measurement is generally of 10 m, but during a prospection of a site, in order to draw up a wind project, it is preferable to take measures at two or three levels for one period at least six months in order to know the evolution of the wind speed at altitudes representing an energy interest. The majority of work on the determination of the wind vertical profile in the surface boundary layer is based on the similarity theory of Monin-Obukov [22][23]. This theory was supplemented by studies which proposed extrapolation laws of the wind speed of a level H 1 on a level H 1 according to the variation of roughness classes.…”

“…This theory was supplemented by studies which proposed extrapolation laws of the wind speed of a level H 1 on a level H 1 according to the variation of roughness classes. In order to draw up a comparative study, two extrapolation laws are retained [22][23][24][25][26][27]: -Logarithmic law ; -Power law.…”

Multifrequency Decoding of a Phased Array Doppler Sodar

“…In its first implementation (McAllister 1968), the information provided is the intensity of the echoes as a function of height and time. During the last two decades, the scope of sodar applications has been enlarged considerably and covers a wide range of different fields, including convective boundary layer (CBL), formation of the nocturnal boundary layer (NBL), inversion layers, wind climatology below ABL, sound absorption in atmosphere, air pollution meteorology and weather forecasting, study of mesoscale flows and turbulence structure under stable and unstable stratification, and new technology development (Brown and Hall 1978;Mastrantonio and Fiocco 1982;Neff and Coulter 1986;Clifford et al 1994; Giannini et al 1996;Kramar and Kouznetsov 2002;Kallistratova and Coulter 2004;Coulter and Kallistratova 2004 and references therein; Kouznetsov et al 2004Kouznetsov et al , 2007Engelbart et al 2007). During the last two decades, the scope of sodar applications has been enlarged considerably and covers a wide range of different fields, including convective boundary layer (CBL), formation of the nocturnal boundary layer (NBL), inversion layers, wind climatology below ABL, sound absorption in atmosphere, air pollution meteorology and weather forecasting, study of mesoscale flows and turbulence structure under stable and unstable stratification, and new technology development (Brown and Hall 1978;Mastrantonio and Fiocco 1982;Neff and Coulter 1986;Clifford et al 1994; Giannini et al 1996;Kramar and Kouznetsov 2002;Kallistratova and Coulter 2004;Coulter and Kallistratova 2004 and references therein; Kouznetsov et al 2004Kouznetsov et al , 2007Engelbart et al 2007).…”

First Results of Experimental Tests of the Newly Developed NARL Phased-Array Doppler Sodar

“…The sodar technique is an established method for profiling the lower atmosphere from near ground to the atmospheric boundary layer (ABL). In the last three decades a large number of studies were carried out using sodar that mainly addressed ABL characteristics and dynamics for example, the convective boundary layer (CBL), formation of the nocturnal boundary layer (NBL), inversion layers, wind climatology below the ABL, sound absorption in the atmosphere, and new technology development Kouznetsov et al 2007Kouznetsov et al , 2004Coulter and Kallistratova 2004, and references therein;Giannini et al 1996;Kramar and Kouznetsov 2002;Mastrantonio and Fiocco 1982).…”