Krasnodar GRES Project Volume I11 Environmental Assessment

Table 4.10
Krasnodar GRES Site (Labinsk metlstn)
I
I
1 50
Probability (%) I Recurrence Rate:
I Once Per
I I vear
I Estimated Max wind speed I
I (rnlsec) I
117 I
20
5 years
23
10
7
10 vears
1 15 years
24
125
15 1 20 vears 127 I
1
0.1
0.1
100 years
1000 years
10000 years
4.1.2.2 Duration and Thickness of lnversions
lnversions and isotherms (air strata with increasing or constant air temperature at
higher altitudes) are frequent in the area of the proposed power plant site. By
inhibiting vertical ascent of emissions from the stack, inversions and isotherms
create unfavorable conditions for emission dispersion.
Short-term observations during the summer period at the Perepravnaya met
station 20-25 km to the north-east of the Veselyi hail control station and the
results of long-term observations at the Minvody serological station 200 km to the
east of the Perepravnaya met station site were used to study inversion
phenomena at the proposed Krasnodar GRES site and its vicinities.
Table 4.1 1 and 4.1 2 are representative of the basic data on inversions and
isotherms.
Table 4.1 3 summarizes the average long-term inversion (isotherm) rate.
Years
1979
1979
-
30
35
40
Table 4.1 1
lnversion and Isotherm Observations at Veselyi for 1979-1 981
Months
VI
VII
Average lnversion (Isotherm)
Thickness Beginning in
0-200 m Stratum (km)
6 hrs
0,30
0,20
Average lnversion intensity'
Beginning in 0-200 m Stratum
(Centigrade)
12 hrs
0,21
0,30
USAID/KRASEIA/OFFICIAL/EIACH4A.DOC 3/26/96 PAGE 4-1 1
-
6 hrs
2,67
1/82
12 hrs
0,48
0,98