Open AccessDaily actual evapotranspiration estimation of different land use types based on SEBAL model in the agro-pastoral ecotone of northwest China
Author(s) -
Liangyan Yang,
Jianfeng Li,
Zenghui Sun,
Jinbao Liu,
Yuanyuan Yang,
Tong Li
Publication year - 2022
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0265138
Subject(s) - ecotone , evapotranspiration , environmental science , albedo (alchemy) , eddy covariance , enhanced vegetation index , vegetation (pathology) , thematic mapper , hydrology (agriculture) , wetland , leaf area index , surface water , shrub , atmospheric sciences , physical geography , ecosystem , normalized difference vegetation index , geography , ecology , remote sensing , vegetation index , satellite imagery , geology , art , environmental engineering , pathology , biology , art history , medicine , geotechnical engineering , performance art
Evapotranspiration (ET) plays a crucial role in hydrological and energy cycles, as well as in the assessments of water resources and irrigation demands. On a regional scale, particularly in the agro-pastoral ecotone, clarification of the distribution of surface ET and its influencing factors is critical for the rational use of water resources, restoration of the ecological environment, and protection of ecological water sources. The SEBAL model was used to invert the regional ET based on Landsat8 images in the agro-pastoral ecotone of northwest China. The results were indirectly verified by monitoring data from meteorological stations. The correlation between ET and surface parameters was analyzed. Thus, the main factors that affect the surface ET were identified. The results show that the SEBAL model determines an accurate inversion, with a correlation coefficient of 0.81 and an average root mean square error of 0.9 mm/d, which is highly suitable for research on water resources. The correlation coefficients of normalized vegetation index, surface temperature, land surface albedo, net radiation flux with daily ET were 0.5830, 0.8425, 0.3428 and 0.9111, respectively. The normalized vegetation index and the net radiation flux positively correlated with the daily ET, while the surface temperature and land surface albedo negatively correlated with the daily ET. The correlation from strong to weak is the net radiation flux > surface temperature > normalized vegetation index > surface albedo. In terms of spatial distribution, the daily ET of water was the highest, followed by woodland, wetland, cropland, built-up land, shrub land, grassland and bare land. However, the SEBAL model overestimates the inversion of daily ET of built-up land.