In order to relieve the pressure of ice flood cand summer flood ontrol in Jiziwan of the Yellow River, the ice floods and summer flood were diverted into the northern margin of Hobq Desert. The ecological pattern of the underlying surface changed, and the regional hydrological cycle was also affected, especially the water consumption process of the underlying surface. In order to deeply clarify the ecological pattern and the driving fac-tors of water consumption change in the northern margin of Hobq Desert, this paper analyzed the evolution charac-teristics of ecological pattern before and after water transfer using GF images. The spatio-temporal variation mecha¬nism of regional water consumption was elaborated by using remote sensing evapotranspiration coupling theory, and the correlation degree between meteorological factors ( temperature, rainfall, humidity and wind speed) and re¬gional water consumption was further evaluated under this background. The results show that: (1) the ice flood and summer flood of the Yellow River significantly affected the ecological pattern of the northern margin of Hobq Desert. After water transfer, the proportion of sandy land area decreased from 72.5% to 15.8% , and the proportion of lake and wetland area increased from zero to 27.5% and 4.5% , respectively. (2) The errors of land surface e-vapotranspiration and water surface evaporation calculated based on the METRIC model and Dalton evaporation the¬ory are 9.2% and 9.3% , respectively. The results of regional water consumption have high reliability. Before water transfer (2013) , at the beginning of water transfer (2016) and after water transfer (2020) , the average evapo¬transpiration in crop growing season (April-October) was 156.22 mm, 231.12 mm and 528.58 mm, respectively, and the influence of water transfer on regional water consumption continued to increase during transit season. (3) The ice flood and summer flood of the Yellow River changed the correlation between evapotranspiration and meteoro¬logical factors ( temperature, rainfall, wind speed, humidity ). The positive correlation between evapotranspiration and temperature and humidity continued to increase, and the proportion of positive correlation areas increased from 73% and 28% before water transfer to 95% and 76%, respectively. © 2023 China Water Power Press. All rights reserved.
