[1]Li Shuai,Song Jinxi,Qi Guizeng.Analysis of Spatiotemporal Variation and Attribution of Evapotranspiration in Weihe River Basin Based on Budyko Model[J].Research of Soil and Water Conservation,2024,31(05):304-314.[doi:10.13869/j.cnki.rswc.2024.05.039]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 05
Page number:
304-314
Column:
Public date:
2024-08-10
- Title:
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Analysis of Spatiotemporal Variation and Attribution of Evapotranspiration in Weihe River Basin Based on Budyko Model
- Author(s):
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Li Shuai1,2, Song Jinxi1,2,3, Qi Guizeng1,2
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(1.College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China; 2.Shaanxi Key Laboratory of Earth Surface System and Environment Carrying Capacity, Xi'an 710127, China; 3.Institute of Qinling Mountains, Northwest University, Xi'an 710127, China)
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- Keywords:
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Budyko model; evapotranspiration; attribution analysis; Weihe River Basin
- CLC:
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K903
- DOI:
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10.13869/j.cnki.rswc.2024.05.039
- Abstract:
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[Objective]The aim of this study is to quantitatively assess the evapotranspiration trends and analyze its response to environmental changes in the Weihe River Basin, so as to be conducive to the study of water resources change in this region. [Methods]Based on the Budyko framework and combined with NDVI, land use type, GLEAM evapotranspiration remote sensing data, meteorological and hydrological data and social and economic data, the trend of each driving factor was analyzed, an empirical model of time-varying Budyko parameter n was constructed, and the elastic coefficient method was adopted to quantitatively evaluate the influence of each factor change on evapotranspiration. [Results](1)From 1990 to 2020, the actual evtranspiration in the Weihe River Basin showed a significant growth trend, with the overall growth rate of 1.98 mm/a, and the spatial trend was gradually decreasing from southeast to northwest.(2)The hydrothermal parameter n of the underlying surface of the Weihe River Basin showed an increasing trend, and parameter n had a high correlation with the NDVI, population, cultivated land area, grassland and GDP of the region. In the simulation of evapotranspiration, the results of the empirical model with time-varying parameter n are better than those with constant parameter n.(3)Evapotranspiration in Weihe River Basin was the most sensitive to precipitation, but not to underlying surface parameter n, which was most sensitive to NDVI.(4)Precipitation contributed the most to evapotranspiration, followed by underlying surface factors, and potential evapotranspiration contributed the least. [Conclusion]Evapotranspiration in the Weihe River Basin showed a significant increase trend during the study period, and climate change played a leading role in the change of evapotranspiration in this region, but the influence of human activities on evapotranspiration became more and more obvious.