A GIS-based model for estimating regional potential evapotranspiration in complex terrains

Xin-yao Zhou; Yong-hui Yang; Xiao-hua Hao

doi:10.1117/12.836957

10 July 2009 A GIS-based model for estimating regional potential evapotranspiration in complex terrains

Xin-yao Zhou, Yong-hui Yang, Xiao-hua Hao

Proceedings Volume 7491, PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering; 74910Z (2009) https://doi.org/10.1117/12.836957
Event: International Conference on Photonics and Image in Agriculture Engineering (PIAGENG 2009), 2009, Zhangjiajie, China

Abstract

The estimation of regional reference evapotranspiration (ET₀) is crucial for agricultural water assessment. Traditional methods based on point-specific ET₀ from meteorological stations are not suitable for complex terrains. Advances of GIS technology provide such possibility. For very complex terrains, however, topography can have considerable effect on meteorological factors such as air temperature and solar radiation. In this paper, spatially distributed daily ET₀ was estimated by FAO Penman-Monteith equation, while the effect of topography on meteorological factors was taken into consideration. This was achieved through spatial interpolation of maximum and minimum air temperature, wind speed, relative humidity and sunshine hours. Solar radiation was modeled at grid level by adjusting the effect of specific site conditions prior to estimating ET₀. To test the reliability and applicability of the model, spatial distribution of ET₀ (resolution 90 × 90 m) was generated for taking Fengning County of North China as an example. There was a good agreement between the site conditions and model simulated ET₀. This study demonstrates the possibility of incorporating topography in the estimation of ET₀.

Citation Download Citation

Xin-yao Zhou, Yong-hui Yang, and Xiao-hua Hao "A GIS-based model for estimating regional potential evapotranspiration in complex terrains", Proc. SPIE 7491, PIAGENG 2009: Remote Sensing and Geoscience for Agricultural Engineering, 74910Z (10 July 2009); https://doi.org/10.1117/12.836957

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