The content of this article comes from the "Surveying and Mapping Bulletin" No. 3 of 2024, drawing review number: GS Jing (2024) No. 0499
Spatiotemporal evolution and driving factors of evapotranspiration in oases in the middle reaches of the Keriya River Basin
Wang Ranran1,2, Lv Guanghui1,2,3, He Xuemin1,2,3, Li Jinbao1,2
1. College of Ecology and Environment, Xinjiang University, Urumqi, Xinjiang, 830017;2. Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi, Xinjiang, 830017;3. Field Scientific Observation and Research Station of Temperate Desert Ecosystem of Jinghe, Ministry of Education, Jinghe 833300, Xinjiang, China
Funds: Research Project on Ecological Dispatch and Ecological Response in the Keriya River Basin (2020.B-003); National Natural Science Foundation of China (41975115)
Key words: Keriya River Basin, evapotranspiration, SEBS model, Landsat, Mann-Kendall trend analysis, Impact factor
Citation:WANG Ranran, LV Guanghui, HE Xuemin, et al. Spatiotemporal evolution and driving factors of evapotranspiration in oases in the middle reaches of the Keriya River Basin[J]. Bulletin of Surveying and Mapping, 2024(3): 31-36.doi: 10.13474/j.cnki.11-2246.2024.0306
Abstract:Evapotranspiration is a key factor in evaluating the hydrothermal cycle of desert oases, and the monitoring of its temporal and spatial changes and the study of its driving force can provide a scientific basis for the precise regulation and control of water resources and the protection of ecological environment. Taking the oasis area in the middle reaches of the Keriya River Basin as the study area, this paper analyzes the spatiotemporal changes of evapotranspiration from 2010 to 2022 based on Landsat remote sensing images and SEBS models, and verifies the accuracy of the estimation results through the measured data of evaporation dishes and the Penman-Monteith model, and further discusses the influencing factors of evapotranspiration. The results showed that the correlation coefficients and R2 between the simulated SEBS values of evapotranspiration and the observed values in the evaporation dish were 0.93 and 0.87, respectively, and the RMSE was 0.96 mm/d, while the correlation coefficients and R2 were 0.90 and 0.81, respectively, and the RMSE was 0.64 mm/d. From 2010 to 2022, the actual evapotranspiration showed a downward trend, and its change rate was 14.75 mm/a. It shows a downward trend in spring, summer, and autumn, and an upward trend in winter. 3. The spatial heterogeneity of evapotranspiration was obvious, and the high values were mainly concentrated near the banks of the Keriya River, while the low values were distributed in the sandy land at the edge of the oasis. In the past 13 years, about 70.2% of the pixels in the whole study area showed no significant downward trend, and 10.4% of the pixels showed a significant downward trend. 4. Evapotranspiration was significantly correlated with air temperature, air pressure, sunshine hours, land surface temperature and NDVI, and weakly correlated with wind speed and surface albedo. Overall, the results of this study can well simulate the spatiotemporal heterogeneity of evapotranspiration in the oasis in the middle reaches of the Keriya River Basin, which is helpful for the rational planning and regulation of water resources in the basin.
About author:WANG Ranran (1998—), female, master's student, main research direction is ecological remote sensing. E-mail: [email protected] Corresponding Author: Lv Guanghui, E-mail: [email protected]
First instance: Yang Ruifang review: Song Qifan
Final Judge: Jin Jun
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