TAILIEUCHUNG - Báo cáo " Potential evapotranspiration estimation and its effect on hydrological model response at the Nong Son Basin"

The potential evapotranspiration can be directly calculated by the Penman-Monteith equation, known as the one-step method. The approach requires data on the land cover and relatedvegetation parameters based on AVHRR and LDAS information, which are available in recent years. The Nong Son Basin, a sub-catchment of the Vu Gia - Thu Bon Basin in the Central Vietnam, is selected for this study. To this end, NAM model was used; the obtained results show that the NAM model has a potential to reproduce the effects of potential. | VNU Journal of Science Earth Sciences 24 2008 213-223 Potential evapotranspiration estimation and its effect on hydrological model response at the Nong Son Basin Vu Van Nghi1 Do Duc Dung2 Dang Thanh Lam2 1 State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering Hohai University China 2 Southern Institute for Water Resources Planning Ho Chi Minh City Received 4 November 2008 received in revised form 28 November 2008. Abstract. The potential evapotranspiration can be directly calculated by the Penman-Monteith equation known as the one-step method. The approach requires data on the land cover and related-vegetation parameters based on AVHRR and LDAS information which are available in recent years. The Nong Son Basin a sub-catchment of the Vu Gia - Thu Bon Basin in the Central Vietnam is selected for this study. To this end NAM model was used the obtained results show that the NAM model has a potential to reproduce the effects of potential evapotranspiration on hydrological response. This is seemingly manifested in the good agreement between the model simulation of discharge and the observed at the stream gauge. Keywords Potential evapotranspiration Penman-Monteith method Piche evaporation Leaf area index LAI Normalized difference vegetation index NDVI . 1. Introduction One of the key inputs to hydrological modeling is potential evapotranspiration which refers to the maximum meteorologically evaporative power on land surface. Two kinds of potential evapotranspiration are necessary to be defined either from the interception or from the root zone when the interception is exhausted but soil water is freely available specifically at field capacity 11 32 . The actual evapotranspiration is distinguished from the potential through the limitations imposed by the water deficit. Evapotranspiration can be directly measured by lysimeters or eddy correlation Corresponding author. Tel. 0086-1585056977. E-mail vuvannghi@ method but it is expensive and .

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