Surgil ESIA Report - Volume III - EKN

“Management of Ustyurt GCC infrastructure objects
and Surgil GCF construction” UE »
Peak daily temperature
Average daily temperature amplitude by months, 0 С
ampli-
tude, 0 С
I II III IV V VI VII VIII IX X XI XII I VII
6.8 7.7 8.1 9.2 9.8 10.2 9.7 9.5 9.6 9.1 7.3 6.0 22.0 23.7
6.6. Soils frost line makes 72sm. Soils frost line possible once in 10 years - 117sm, once in 50
years - 138cм.
6.7. Average annual relative air humidity makes 70%, average monthly relative air humidity for
January makes 83%, for July - 58%. Data on absolute air humidity by months is resulted in table
6.3.
Table 6.3 – Average monthly data on absolute air humidity by long-term observations at
Muynak meteorological station
Months I II III IV V VI VII VIII IX X XI XII
Absolute air humidity
by Muynak
meteorological station,
mb.
3.6 3.7 5.1 8.2 12.5 16.5 20.2 19.0 13.9 9.0 6.2 4.4
6.8. Annual amount of precipitations makes 121mm. In annual variation of precipitations this area
concerns to transitive zone between northern latitudes for which prevalence in a year of precipitations
of the warm period is characteristic, and more southern where precipitations mainly during the
cold period of year. Maximum amount of precipitations in April - 18mm that makes 16% from the
annual rainfall, less precipitations in July, August and September. Peak daily amount of precipitations
in some day - 66mm. Snow cover does not exceed 17sm, days with snow cover equal to 27.
6.9. The important meteorological factor influencing on atmospheric pollution level is the wind
conditions formed under the influence of atmospheric pressure and circulating processes and defining
a direction and transport range of harmful impurities. From that follows, that air pollution characteristic
in this zone is the raised natural origin dust content at the expense of a strong wind.
6.10. There are prevailed winds of northern, northeast and east directions in annual rainfalls. There
are prevailed winds of east, northeast and western directions in January. There are prevailing winds
of northern and northeast directions in July. Average monthly wind speed in January is 4.2km/s, in
July – 4.8km/s (table 6.4). Annual peak wind speed observed at Muynak meteorological station
made 25km/s.
Table 6.4 – Wind directions and speeds characteristic by months
(January and July)
Months
Wind direction
January
July
Average speed,
Average speed,
Repetition, %
Repetition, %
m/s
m/s
N 4.2 10 4.8 32
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