year 1, Issue 3 (3-2018)                   wrsm 2018, 1(3): 38-46 | Back to browse issues page

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Experimental Study of the Effects of a Reducing Agent Evaporates and the Combined Effects of meteorological Parameters on the Process of Evaporation. wrsm. 2018; 1 (3) :38-46
Abstract:   (1668 Views)
Evaporation from water reservoir is one of the issues that should be taken seriously in
water resources management. One of the management solutions for preserving water resources
is the reduction of evaporation from dam reservoirs. In this study, foreign water saver powder
and its domestic sample, which is a mixture of hexadecanol and hexadecanol with significant
amounts of calcium hydroxide, is used and the quantitative effects of the use of foreign and
domestic powders on the amount of water evaporation reduction have been investigated In order
to carry out the study, an equal amount of foreign and domestic commercial powder weighing
10 mg were added to pre-prepared pools and ponds, and one of the pools as a control was
monitored without adding any reducing agent. The ponds were placed in a 22-day period under
completely identical conditions in the presence of normal sunlight. All samples were weighed
every 24 hours and weighted reduction were calculated. The results showed that evaporation
from water for control samples, added with domestic powder and added with powder, was
similar in the research day, but regarding the effect of adding commercial powders on the rate of
increase or decrease of evaporation from the water cannot be conclusively decided. Comparison
of evaporation rate from the water for ponds indicates that in majority of the measurement days,
the addition of foreign powder has reduced the evaporation from the surface of the water. Also,
due to the effect of meteorological parameters on evaporation from the water, meteorological
parameters including the daily mean temperature, wind speed and relative humidity in the time
of evaporation measurements were collected from the nearest meteorological station. Findings
have shown that although the daily temperature changes and evaporation rates from pond have
increased from the time of measurement to the end, the statistical correlation between them was
not significant. Regarding the effect of the wind parameter, due to the high temporal
fluctuations of this parameter, its mathematical relationship with evaporation from the pond
water was not obtained in this study. Investigating the effect of relative humidity parameters,
sunshine hours and vapor pressure on evaporation rate indicates an inverse correlation between
these parameters and the rate of evaporation from the water. The some well –known empirical
methods were employed to estimate evaporation from water surfaces. Results showed that the
estimated values of the empirical methods of the USBR, Mayer and Ivanov are close to the
values measured in the water ponds.
Full-Text [PDF 1429 kb]   (261 Downloads)    
Type of Study: Research |
Received: 2017/12/26 | Accepted: 2018/03/14

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