Study the Possibility of Using the method of Pan Class "A" and some Simplified formulas to estimate Evapotranspiration Potentielle in Lattakia region


Abstract in English

The aim of this research is to simplify the methodof getting Evapotranspiration Potentielle (ETP) which forms the limit of water needs for crops . This was using done some experimental Equation like Turc formula and Thornthwaite formula (Thornthwaite, 1948) compared with the modified Blaney_ Criddle formula ( BlaneyCriddle , 1950) which is considered the basic formula in this research . Also , this research aims to find a formula enables us to use (Pans evaporation) method (class A) as a relative evidence to the need of watering in Lattakia by comparing it with the results of Evapotranspiration Potentielle which are calculated by the modified Blaney _Criddle method depending on climate data from Lattakia for fifteen years (2001 – 2015) . The results of studying the correlation coefficient and how the experimental points spread around the linear regression curve show that Turc gave the best approximaltion result to the developed Blaney – Criddle formula with correlation coefficient (R=0.907). After Turc formula there is Thornthwaite formula with correlation coefficient (R=0.846) . On the other hand Pan class A method gave approximal results to the developed Blaney– Criddle formula with correlation coefficient (R=0.925) and with good distribution of the experimental points around the linear regressions straight. So, in this study experimental conditions it could beased on Turc formula and Pan class A method as the best approximation to the developed Blaney- Criddle formula to define the water requirement of the agriculture crops in Lattakia.

References used

BLANEY, H.F. ,CRIDDLE, W.D.Determining water requirements in irrigation areas from cliatological and irrigation data, U.S. soil conserServ.Tech, ,Washington,1950,9
GEORGE H. HARGREAVES, ZOHRAB A. SAMANI. Estimating Potential Evapotranspiration, Journal of the irrigation and Drainage Division, 1992, Vol. 108, Issue 3, Pg. 225- 230
IFTIKAR, A. ALANI, MOZAHEM.ABED, ALAA. YAQOB. Estimation of daily potential Evapotranpiration using Pan evaporation class A for Mousel region,Tikrit journal of engineering science.vol(16).No(4).pp.1-5

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