Parameterization and evaluation of infiltration models for two soils plains of Duhok region under different landuses

الملخص EN

The aims of this study were to parameterization and evaluation of two infiltration models for two plains soils under semi-arid conditions with different landuses types, such as cultivated, fallow, and orchard landuses.

the infiltration models evaluated were Kostiakov, and Philip.

the research was conducted at the three sites represent two major plains of Duhok governorate of Iraqi-Kurdistan region.

two models exhibiting the best performance are Kostiakov, and Philip-two term, Regarding the Kostiakov model, the coefficient parameter value of (C) is directly proportional to the initial infiltration rate whereas the exponential time parameter value of (n) is inversely proportional to the initial infiltration rate.

it can be concluded that the value of C is correlated with the capillary force at the beginning of infiltration, concerning to the Philip model the value of sorptivity (S) was close to the value of the initial infiltration rate.

this is due to the function of S parameter which has the soil suction potential and that transmissivity value considered to 0.33 of saturated hydraulic conductivity of soil.

infiltration models evaluation revealed that the Philip-two term model is more suitable for cultivated land CL and orchard land OL and Kostiakov model fallow landuses FL for the two investigated sites of Semel, and Zakho.