Prof. Qiongfang Li Profile

Prof. Qiongfang Li

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Proceedings Article | 15 October 2009 Paper

Spatial-temporal variations of evapotranspiration in the upper Huaihe River basin

Qiongfang Li, Meixiu Yu, Yunhong Xue, Peng Li, Bin You

Proceedings Volume 7492, 749212 (2009) https://doi.org/10.1117/12.838700

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Evapotranspiration, which is an important component of water cycle, is a critical variable in determination of local water resources available. This paper selected the upper Huaihe River as case study site. The daily reference evapotranspiration was computed by the Penman-Monteith method, and then the mean annual reference evapotranspiration (ET_ref), the decadal average values of annual ET_ref and the decadal average values of annual seasonal ET_ref were calculated and mapped. The results revealed that the spatial distribution of mean annual ET_ref was uneven with a clearly decreasing gradient in the mean annual ET_ref from the east to the west; The spatial and temporal distribution of decadal average values of annual ET_refvaried with decades and from 1960s to 1980s , there existed a decreasing trend with an increasing trend from 1980s to 1990s; The spatial and temporal distribution of decadal averages of annual seasonal ET_ref varied with seasons and decades. The decadal average in spring decreased with decades, while the value in summer had a decreasing trend from 1960s to 1980s with an increasing trend in 1990s compared with 1980s, and the decadal averages both in autumn and winter increased from 1960s to 1970s then decreased in 1980s with an increasing trend in 1990s compared with 1980s. The output of this paper provides a valuable reference for the forecast of future water resource available and the sustainable development and utilization of water resources in the Huaihe river basin.

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