Using MODAWEC to generate daily weather data for the EPIC model

Authors:
Junguo Liu;Jimmy R. Williams;Xiuying Wang;Hong Yang
Affiliations:
Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Duebendorf, Switzerland;Texas Agricultural Experiment Station, Blackland Research and Extension Center, 720 E. Blackland Road, Temple, TX 76502, USA;Texas Agricultural Experiment Station, Blackland Research and Extension Center, 720 E. Blackland Road, Temple, TX 76502, USA;Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Duebendorf, Switzerland
Venue:
Environmental Modelling & Software
Year:
2009

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Abstract

Although the EPIC model has been widely used in agricultural and environmental studies, applications of this model may be limited in the regions where daily weather data are not available. In this paper, a stand-alone MODAWEC model was developed to generate daily precipitation and maximum and minimum temperature from monthly precipitation, maximum and minimum temperature, and wet days. A case study shows that the crop yields and evapotranspiration (ET) simulated with the generated daily weather data compare very well with those simulated with the measured daily weather data with low normalized mean square errors (0.008-0.017 for crop yields and 0.003-0.004 for ET). The MODAWEC model can extend the application of the EPIC model to the regions where daily data are not available or not complete. In addition, the generated daily weather data can possibly be used by other environmental models. Associated with MODAWEC, the EPIC model can play a greater role in assessing the impacts of global climate change on future food production and water use.