The WHEAT Model

The daily values of potential and actual evapotranspiration (PET, ET) of a wheat crop are computed using a model that takes into account the soil hydraulic characteristics; daily atmospheric conditions and water availability and the growing stage of the crop. These daily calculations of PET and ET are further used for the calculation of a seasonal stress index (SI), which is linked to the grain wheat yields through a previously established and validated regression equation.

The daily atmospheric input data (rainfall; temperature; radiation; wind speed and humidity) are provided by the Global Climate Model (GCM) ECHAM4 (Scenario B2) and the Regional Model MM5 with a 18 km resolution provided by IMK-IFU (Project 4.1).

The spatial distribution of wheat yields was calculated for each soil type within each climatologic grid cell for two periods (1961–1990 and 2070–2099), and spatial maps describing changes in wheat yields between past and future climate were produced for the upper Jordan Basin (Project 3.4.1).

Design by noname designs.