Arid Zone Research ›› 2020, Vol. 37 ›› Issue (6): 1378-1387.doi: 10.13866/j.azr.2020.06.02

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Evapotranspiration in the Jinghe River Basin based on the surface energy balance system

ZHENG Qian-qian1, DAI Peng-chao2, ZHANG Jin-yan1, WU Zhao-peng1, 3   

  1. (1. College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi 830054, Xinjiang, China; 2. Urumqi Meteorological Satellite Ground Station, Urumqi 830054, Xinjiang, China; 3. Laboratory of Arid Lake Environment and Resources, Urumqi 830054, Xinjiang, China)
  • Received:2019-09-23 Revised:2020-08-11 Online:2020-11-15 Published:2021-01-24

Abstract: The arid ecological fragile area of Jinghe Basin was selected as the research area. Daily meteorological observation data from 1990 to 2016 and six scenes of corresponding Landsat series images were investigated. The results show that under the context of global warming, evapotranspiration in the study area as a whole has increased over the past 26 years and Morlet wavelet analysis shows that there are 5 a, 7 a, 13 a scale change cycles. Additionally, evapotranspiration in the study area is spatially high in the south and low in the north. The evapotranspiration was reduced in the unused land in the northeast and significantly increased in the northwestern part of Lake Aibi and the southern mountainous area. Evapotranspiration under different land-use types followed the pattern from high to low of forest land > water body > grassland > cultivated land > construction land > unused land. Among the measured meteorological factors, wind speed was highly positively correlated with surface evapotranspiration, along with elevation and specific surface emissivity. The meteorological factors that show a highly negative correlation with surface evapotranspiration were near-surface air relative humidity, and the surface parameters were temperature vegetation drought index and surface temperature.

Key words: SEBS model, evapotranspiration, space-time pattern, Jinghe River Basin, Xinjiang