Temporal and spatial characteristics of evapotranspiration in Dawen River Basin based on SEBS model

Water is crucial for all life on Earth and is essential for human survival and development. In nature, the Earth's hydrological cycle relies on the evaporation of both marine and terrestrial water as the only means of water entering the atmosphere. This is one of the primary links in the hydrological cycle. The study of evapotranspiration is becoming increasingly important in the management of water resources and environmental protection. The current research on the spatial and temporal characteristics of evapotranspiration in the Dawen River Basin is limited, lacking in-depth analysis and systematisation. This study aims to fill the research gap and provide a comprehensive understanding of evapotranspiration in the Dawen River Basin. This information will be useful in optimising water resource management. The study area's relevant information was obtained through first collecting GLDAS meteorological data and Landsat8 remote sensing image data. The SEBS model was used to estimate and analyze evapotranspiration next. According to the results, the evapotranspiration in the study area displays a seasonal pattern indicating a relative increase from winter to summer. Furthermore, various land cover areas present similar seasonal change characteristics, with a consistent overall pattern. However, the magnitude of seasonal changes in evapotranspiration varies significantly among different land cover types. Evapotranspiration changes across different land cover types are most striking during the summer, and the dynamics pattern can be classified as follows: Water > Cropland > Wasteland > Grassland > Forest > Shrub > Impervious.