Characteristics of Reference Evapotranspiration of Wetland Based on Penman-Monteith and Hargreaves Methods

Abstract:

Evapotranspiration (ET) constitutes the dominant water loss from many different types of wetlands. The relative importance of ET is apparent in its influence over water depth, temperature and salinity. However, direct measurement of ET, especially for wetland, is difficult, costly, and rarely available. In this study, the Penman-Monteith model was selected to estimate the reference evapotranspiration for short and tall canopies, moreover, Hargreaves equation was also used to simulate the ET_ref and test the precision of Penman-Monteith method. The results show that the reference evapotranspiration are maximal between June and August and minimal in winter, and ET_rs is larger than ET_os in the whole simulation periods. H ET₀ and ET_os have the same variation trend, but the former was smaller than the latter during May to September. Finally, there is a strong correlation between ET_os and ET_rs, with the correlation coefficient are 0.98 and 0.99 at daily and monthly means scale.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 3013-3016
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.3013
• Online since: December 2012
• Authors: Xiang Hu Li, Qi Zhang, Yun Liang Li
• Keywords: Hargreaves Equation, Penman-Monteith Equation, Reference Evapotranspiration, Wetland

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