Surgil ESIA Report - Volume III - EKN

“O’ZLITINEFTGAZ” PC
PFS “Surgil field complex costruction with valuable
components retrieval”
Annual average of air temperature is 10.2 0 С. Monthly average of air temperature of
the coldest month (January) equally -5.9°С, monthly average of air temperature of the
warmest month (July) equally 26.6°С. Absolute minimal air temperature is -31 0 С, absolute
maximal air temperature - 44 0 С. Duration of the heating period is 167 days. Duration of the
period with daily average temperature less than 0 0 С - 104 days.
Annual average of atmospheric pressure is 1010 kPa.
Table 1 – Monthly average and annual soil temperature on 1.6 m depth as follows:
January – 9.3 February – 8.0 March – 8.0 April – 9.7
May – 13.6 June – 17.4 July – 20.7 August – 22.6
September – 22.8 October – 20.4 November – 16.9 December – 12.8
Annual – 15.2
The overall depth of frost penetration is 72m. Frost line is possible, once in 10 years
– 117sm, once in 50 years – 138sm.
There are prevailing the winds of northern, northeast and east directions in annual
distribution. There are prevailing the winds of east, northeast and western directions in
January. There are prevailing the winds of northern and northeast directions in July.
Monthly average wind speed in January and July is 4.1m/s. Annual maximum wind speed is
25 m/s (Muynak m.s.) and 35m/s (Kungrad m.s.).
Annual average relative air humidity is 70%, monthly average relative air humidity
for January is 83%, for July - 58%.
Annual amount of precipitations is 121mm. In annual variation this region concerns
to transition zone between northern latitudes for which prevalence of the precipitations of
warm period in a year is characteristic and more southern where precipitations mainly drop
out during the cold period of year. Most amount of precipitations is drop out in April -
18mm that makes 16% from the annual rainfall, least of all precipitations is drop out in July,
August and September. Maximum daily amount of precipitations is 66mm.
Snow cover does not exceed 17sm, number of days with snow cover equally 27.
Number of days with dusty storm and drifting dust is equal to 57 during the year.
Number of hours with a thunderstorm is – 9 during the year.
According to division into districts of the territory of Uzbekistan under the climatic
characteristics this territory concerns to 1 area by wind pressure wind with standard value
0.38 kPa and to 1 area by snow loads with standard value 0.5 kPa.
The standard thickness of ground surface icing wall with periodicity once in 5 years
is 15mm, once in 10 years - 20mm.
Irreversible changes in Aral area climate are connected with Aral Sea drying. There
is a deterioration of hydrogeological mode in the region, and registered the tendency to
strengthening of air pollution by harmful substances.
Volume 2. Part 1. EIS Project for Surgil field construction
8