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[1]CUI Hao,WANG Lichuan,WANG Hejia,et al.Temporal and Spatial Changes of Actual Evapotranspiration and Its Relationship with Meteorological Factors in the Three Gorges Reservoir Area[J].Research of Soil and Water Conservation,2021,28(04):193-202.

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Temporal and Spatial Changes of Actual Evapotranspiration and Its Relationship with Meteorological Factors in the Three Gorges Reservoir Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 04 Page number: 193-202 Column: Public date: 2021-08-10

Title:: Temporal and Spatial Changes of Actual Evapotranspiration and Its Relationship with Meteorological Factors in the Three Gorges Reservoir Area

Author(s):: CUI Hao¹, WANG Lichuan^1,2, WANG Hejia¹, XIAO Weihua¹, HOU Baodeng¹, GAO Bin¹; (1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)

Keywords:: Three Gorges Reservoir area; actual evapotranspiration; spatiotemporal variation characteristics; meteorological factors

CLC:: P426.2

DOI:: -

Abstract:: In order to explore the temporal and spatial characteristics of evapotranspiration(ET)in the Three Gorges Reservoir area and the impact of climate change on it, based on the land surface model CLM4.5, the actual evapotranspiration in the study area was simulated and analyzed, and the temporal and spatial characteristics of the actual evapotranspiration in the Three Gorges Reservoir area were analyzed. We further analyzed the relationship between actual evapotranspiration and climate factors in the study area by using the correlation analysis method. It is found that:(1)the actual evapotranspiration simulated by the CLM4.5 model is positively correlated with ET-MOD16(R²=0.91), which can reflect the needs of research on actual evapotranspiration in the study area in a good manner;(2)ET shows obvious spatial heterogeneity, ET in the watershed gradually increases when approaching the main streams, and vegetation transpiration accounts for the largest proportion of ET;(3)on the time scale, ET increases after water storage of the reservoir compared with before storage, ET presents a typical seasonality in its annual changes, and decreases in the order: summer>spring>autumn>winter. The actual evaporation, land evaporation, and vegetation transpiration have increased after the impoundment of the Three Gorges Reservoir area compared with those before the impoundment, and the vegetation evaporation has decreased. During a year, ET is positively correlated with the temperature and precipitation in the entire study area. Temperature is the climatic factor that has the greatest impact on the annual change of ET in the Three Gorges Reservoir area.

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Last Update: 2021-08-20