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Computation of Evaporation in Cold Season in Relation to Total Annual Evaporation, Case Study: Iranian Central Basin

Author:
[ Ali.Asgar Roshan ] -

Abstract:

Evaporation is the process of converting water into vapor. It is regarded as the mair climatic characteristics in relation to general condition of the weather, and is considered as an important component of water balance in the basins. Since a great amount of water vaporizes in hot and dry areas of Iran, it is necessary to be informed of the amount of this evaporation, in order to develop and perform civil projects. Recorded data of evaporation in the annuals Min of Energy I.R. of Iran and Meteorological Organization (IRIMO) is somehow lack of related data for cold months. However, it is very important to consider such data in total annual evaporation. Paying no attention to such data makes some difficulties in the work of the experts. In this research, using the years with 12 months of evaporation in each station, we compute the ratio of evaporation in hot months to all months of the year, and average the coefficient for each station. Then, correlation between coefficients is computed, using latitude, altitude, and average of maximum temperature of the stations. After that, through multi-variation regression, we compute the mentioned coefficient for the years which was lack of evaporation of cold months as well as stations not having related data for mentioned months, then evaporation of cold months in total annual was taken into consideration. Having the high significant coefficient mentioned in the paper, we can utilize it to compute evaporation in cold months in the total annual evaporation of the region, without using evaporation measuring pan.

Keywords:

Evaporation, Central basin, Latitude, Correlation coefficient, Multi-variation regression.