Recent changes of Lake Nasser hydrology: Selecting the Method and Model of Free Water Evaporation Techniques to Represent Lake Nasser Hydrology

HADL evaporation prediction have been and still studied by many researchers to choose the best model of the Lake evaporation prediction. In this study many methods and models were tested and correlated to water budget to find the best model for Lake evaporation prediction. These methods namely water budget method, energy budget method, mass transfer method, radiation methods, temperature based methods and combination methods. Then trend analysis was performed on Lake Inflows and evaporation both monthly and annually. The results showed that energy budget method, especially Priestley-Taylor model is the best model representing the Lake Evaporation. Also the trend analysis showed that, there is no accountable change in Lake inflows, as well as evaporation at any month or even in annual basis.