Surgil ESIA Report - Volume III - EKN

“Management of Ustyurt GCC infrastructure objects
and Surgil GCF construction” UE »
Appendix 3
CALCULATION OF LIQUID EVAPORATION THICKNESS FROM SURFACE LAYER
IN THE REGION OF SURGIL FIELD
Calculation of evaporation from turbid and saline reservoirs and storages of industrial drains
is carried out according to method resulted in “Instructions on calculation of evaporation from reservoirs
surface”. L. Gidrometeoizdat, 1969 - by formula:
E m = r х E o , (P3.1)
where: E p – mud evaporation from industrial drain;
E o – pure fresh water evaporation for the same period of time;
r – conversion factor from evaporation with pure fresh water to evaporation from mud.
Evaporation volume from reservoir E o (mm) located in the plain territory is defined by formula:
E o = 0.14 х п х (е п – е 200 ) х (1 + 0.72 x v 200 ), (P3.2)
where: п – number of days in design time space (month);
е п – average value of maximal steam tension, mb. It is defined according to tables in Appendix
3 (“Instructions on calculation of evaporation from reservoirs surface”. L. Gidrometeoizdat,
1969);
е 200 – average value of steam tension (absolute air humidity) over reservoir at the height of
200sm, mb;
v 200 – average value of wind speed over reservoir at the height of 200sm, m/s.
Average value of steam tension (absolute air humidity) reservoir at the height of 200sm
е 200 (mb) is calculated by formula:
е 200 = е’ 200 + (0.8 х е п – е’ 200 ) х М, (P3.3)
where: е’ 200 – average for design time space of air humidity measured at nearby meteorological station,
mb;
М –transformation ratio considering average air humidity and temperature change depending
on the reservoir capacity. Defined under table 4 (“Instructions on calculation of evaporation
from reservoirs surface”. L. Gidrometeoizdat, 1969). In our case, transformation ratio changes depending
on season of year from 0.01 to 0.003.
Average value of wind speed over reservoir at the height of 200sm v 200 (m/s) is calculated
by formula:
v 200 = К 1 х К 2 х К 3 х v ф , (P3.4)
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