SLIDE 14 19.08.2008 Enviromis-2008 14
“METEO 3.0” allows to calculate next turbulence parameters:
1)
Ev = (σu
2 + σv 2 + σw 2)/2 is turbulent movement full energy (σu 2, σv 2, σw 2 is dispersions of turbulent pulsation of
wind speed third component u/, v/, w/); 2) Iv = Ev /Vm
2 is relative intensity of wind speed fluctuations (Vm is averaging wind speed vector module);
3) ET = σT
2/ 2 is energy of temperature fluctuations (σT 2 is dispersions of turbulent pulsation of temperature T/);
4) <u/ ·w/> is moment of pulse flow (< > is statistical average symbol); 5) <T /·w/> is moment of heat flow (temperature flow); 6) τ = -ρ <u/ ·w/> is pulse vertical flow (ρ is air density); 7) H = Cp ρ <T / ·w/> is vertical heat flow (Cp is specific heat capacity of air for constant pressure); 8) v* = (- < u/ ·w />)1/2 is friction speed (wind scale); 9) T* = - <T / ·w />/v* is temperature scale; 10) L* = <T>(v*)2/(χ g T*) is Monin-Obukhov scale (χ = 0,4 and g = 9,81 m/s2); 11) Cd = (v*/<V>)2 is air resistance coefficient; 12) CT
2 = <[T /(t+∆t) − T /(t)]2>/(<Vm>∆t)−2/3 is structural constant of temperature fluctuations (∆t is time interval
between the measurements of instantaneous weather parameters); 13) CV
2 = <[u/(t+∆t)-u/(t)]2>/(<Vm>∆t)-2/3 is structural constant of wind fluctuations;
14) Cna
2 = CT 2/(2<Tk>)2+Cv 2/(<c>)2 is structural constant of acoustic refraction coefficient fluctuations (Tk is air
temperature, K; c is sound speed); 15) Cno
2 = CT 2{8·10-5 <P>/<Tk>2}2 is structural constant of optical refraction coefficient fluctuations (P is
barometric pressure, hPa).
IMCES SB RAS
АМК-03 ultrasonic automated weather station and its possibilities…
1 11 1. . Example of Example of “ “METEO 3.0 METEO 3.0” ” software application software application
