التباين المكاني في قيم الضياع المائي بوساطة عملية التبخر النتح الممكن في العراق : دراسة نقدية مقارنة لاستخدام معادلتي ثورنثويت و خوسلا

الملخص EN

The term evapotranspiration is widely used in the field of agroclimatology to refer to the amount of the water that evaporates from the soil and from the moisture in the environment, or as a result of the processes of transpiration.

Evaporation has a prominent presence in the hydrological cycle or in the water balance, sine the evaporation is regarded as the counter process of fall and it results in the loss of water from water and land surfaces alike.

Hence it has negative effects on agriculture, particularly in arid and semi-arid zones.

As for transpiration, it is the transmission of water within living plants by means of the perforations on the leaves so that the water is transported to the atmosphere continuously.

The present paper examines potential evapotranspiration values in fifteen climate stations that extend from the northern region of Iraq to the southern part of the country, and from the eastern part to the west.

The two equations used to conduct this study are the Khosla Equation and the Thornthwaite Equation.

Afterwards, the results of the two equations are compared and the mean of monthly and annual variations are classified.

The research aims at detecting the resulting identical or variant degrees in the two equations.

It also aims at revealing the differences among the climate zones and the causes of these differences.

A full climate cycle of thirty years was adopted for the purposes of the study.

Furthermore, a comparative assessment was made with a previous research on this topic, which was confined to the Khosla equation.