Proceedings of the Korea Water Resources Association Conference (한국수자원학회:학술대회논문집)
- 2019.05a
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- Pages.153-153
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- 2019
Developing a soil water index-based Priestley-Taylor algorithm for estimating evapotranspiration over East Asia and Australia
- Hao, Yuefeng (Dept. of Water Resources, Sungkyunkwan University) ;
- Baik, Jongjin (Center for Built Environment, Sungkyunkwan University) ;
- Choi, Minha (Dept. of Water Resources, Sungkyunkwan University)
- Published : 2019.05.29
Abstract
Evapotranspiration (ET) is an important component of hydrological processes. Accurate estimates of ET variation are of vital importance for natural hazard adaptation and water resource management. This study first developed a soil water index (SWI)-based Priestley-Taylor algorithm (SWI-PT) based on the enhanced vegetation index (EVI), SWI, net radiation, and temperature. The algorithm was then compared with a modified satellite-based Priestley-Taylor ET model (MS-PT). After examining the performance of the two models at 10 flux tower sites in different land cover types over East Asia and Australia, the daily estimates from the SWI-PT model were closer to observations than those of the MS-PT model in each land cover type. The average correlation coefficient of the SWI-PT model was 0.81, compared with 0.66 in the original MS-PT model. The average value of the root mean square error decreased from