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Jie ZHAO, Zong-xue XU, De-peng ZUO, Xu-ming WANG. 2015: Temporal variations of reference evapotranspiration and its sensitivity to meteorological factors in Heihe River Basin, China. Water Science and Engineering, 8(1): 1-8. doi: 10.1016/j.wse.2015.01.004
Citation: Jie ZHAO, Zong-xue XU, De-peng ZUO, Xu-ming WANG. 2015: Temporal variations of reference evapotranspiration and its sensitivity to meteorological factors in Heihe River Basin, China. Water Science and Engineering, 8(1): 1-8. doi: 10.1016/j.wse.2015.01.004
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Temporal variations of reference evapotranspiration and its sensitivity to meteorological factors in Heihe River Basin, China

doi: 10.1016/j.wse.2015.01.004

  • College of Water Sciences, Beijing Normal University, Beijing 100875, P. R. China

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 91125015), and the Central Nonprofit Research Institutes Fundamental Research of the Yellow River Institute of Hydraulic Research (Grant No. HYK-JBYW-2013-18).
More Information
  • Corresponding author: Zong-xue XU
  • Received Date: 2014-07-12
  • Rev Recd Date: 2014-12-22
    Abstract
  • On the basis of daily meteorological data from 15 meteorological stations in the Heihe River Basin (HRB) during the period from 1959 to 2012, long-term trends of reference evapotranspiration () and key meteorological factors that affect  were analyzed using the Mann-Kendall test. The evaporation paradox was also investigated at 15 meteorological stations. In order to explore the contribution of key meteorological factors to the temporal variation of , a sensitivity coefficient method was employed in this study. The results show that: (1) mean annual air temperature significantly increased at all 15 meteorological stations, while the mean annual  decreased at most of sites; (2) the evaporation paradox did exist in the HRB, while the evaporation paradox was not continuous in space and time; and (3) relative humidity was the most sensitive meteorological factor with regard to the temporal variation of  in the HRB, followed by wind speed, air temperature, and solar radiation. Air temperature and solar radiation contributed most to the temporal variation of  in the upper reaches; solar radiation and wind speed were the determining factors for the temporal variation of  in the middle-lower reaches.

     

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