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| DOI：10.13522/j.cnki.ggps.2017.0662 |
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| Change of the Potential Evapotranspiration in Western Ordos Plateau: Taking Etoke County as an Example |
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SUN Jie, WANG Qiangmin, LIU Ji
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1. Xi’an Research Institute of China Coal Technology & Engineering Group Corp, Xi’an 710054, China;2. Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology in Shaanxi Province, Xi’an 710054, China;3. China Coal Research Institute, Beijing 100013, China
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| Abstract: |
| 【Objective】Potential evapotranspiration is an important parameter in water resource management, and in this paper, we calculated its change in Western Ordos Plateau by taking Etoke County as an example. 【Method】The potential evapotranspiration was calculated by the FAO Penmen-Monteith equation using the meteorological date measured from 1957 to 2013 in the region. The variation of the calculated potential evapotranspiration was analyzed using the Mann-Kendall curve, cumulative departure curve, Morlet wavelet analysis, regression analysis and the contribution rate calculation. 【Result】The potential evapotranspiration in the studied area had been decline from 1957 to 2013 at 1.51 mm/per annum, with abrupt changes in 1992 for annual average and in 1991 for summer average. Its variation in spring, autumn and winter was relatively smooth. We identified two periods for the potential evapotranspiration, one was 28 to 29 years and the other one was 9 to 10 years. The prediction showed that potential evapotranspiration is to increase from 2013 to 2022．【Conclusion】 The decrease in wind speed is the main factor driving the potential evapotranspiration in the study area to decline. The decreases in sunshine duration and precipitation also play an role in reducing the potential evapotranspiration in this region. |
| Key words: Western Ordos Plateau; Penman-Monteith equation; potential evapotranspiration; regression analysis |
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