Abstract:

【Objective】 The aim of this paper is to test the validity of SIMETAW (simulation of evapotranspiration of applied water) model developed by the University of California in Northwest of Liaoning Province, China. 【Method】 The comparison with model simulated and field measured evapotranspiration of maize, soybean and millet in northwest of Liaoning province were conducted, as well the analysis of the historical evapotranspiration and water demand of local main crops by applying the tested SIMETAW model were completed. 【Result】 The results showed that the model have good performances in simulating dynamic of main crops’ evapotranspiration intensity in northwest of Liaoning, and the simulated total evapotranspiration was very close to the field measured data, the relative error between the comparison was less than 10%. Based on the model simulation, the simulated multi-years’ average evapotranspiration for maize, soybean and millet during the growth stage were 514.15, 449.64 and 389.12 mm respectively, and the water demand for these three crop were respectively 208.4, 220.93 and 116.17 mm. 【Conclusion】 SIMETAW model has well validity on simulating the evapotranspiration of maize, soybean and millet in northwest of Liaoning province. The model can be further applied to water management study and guide irrigation in this region.

Key words: SIMETAW model, evapotranspiration, water demand, model test, simulation