Informing the SWAT model with remote sensing detected vegetation phenology for improved modeling of ecohydrological processes
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Informing the SWAT model with remote sensing detected vegetation phenology for improved modeling of ecohydrological processes. / Chen, Shouzhi; Fu, Yongshuo H.; Wu, Zhaofei; Hao, Fanghua; Hao, Zengchao; Guo, Yahui; Geng, Xiaojun; Li, Xiaoyan; Zhang, Xuan; Tang, Jing; Singh, Vijay P.; Zhang, Xuesong.
In: Journal of Hydrology, Vol. 616, 128817, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Informing the SWAT model with remote sensing detected vegetation phenology for improved modeling of ecohydrological processes
AU - Chen, Shouzhi
AU - Fu, Yongshuo H.
AU - Wu, Zhaofei
AU - Hao, Fanghua
AU - Hao, Zengchao
AU - Guo, Yahui
AU - Geng, Xiaojun
AU - Li, Xiaoyan
AU - Zhang, Xuan
AU - Tang, Jing
AU - Singh, Vijay P.
AU - Zhang, Xuesong
N1 - Publisher Copyright: © 2022 Elsevier B.V.
PY - 2023
Y1 - 2023
N2 - The Soil and Water Assessment Tool (SWAT) model has been widely applied for simulating the water cycle and quantifying the influence of climate change and anthropogenic activities on hydrological processes. A major uncertainty of SWAT stems from the poor representation of vegetation dynamics due to the use of a simplistic vegetation growth and development module. Using long-term remote sensing-based phenological data, the SWAT model's vegetation module was improved by adding a dynamic growth start date and the dynamic heat requirement for vegetation growth rather than using constant values. The new SWAT model was verified in the Han River basin, China, and found its performance was much improved in comparison with that of the original SWAT model. Specifically, the accuracy of the leaf area index (LAI) simulation improved notably (coefficient of determination (R2) increased by 0.193, Nash–Sutcliffe Efficiency (NSE) increased by 0.846, and percent bias decreased by 42.18 %), and that of runoff simulation improved modestly (R2 increased by 0.05 and NSE was similar). Additionally, it is found that the original SWAT model substantially underestimated evapotranspiration (Penman-Monteith method) in comparison with the new SWAT model (65.09 mm (or 22.17 %) for forests, 92.27 mm (or 32 %) for orchards, and 96.16 mm (or 36.4 %) for farmland), primarily due to the inaccurate representation of LAI dynamics. Our results suggest that an accurate representation of phenological dates in the vegetation growth module is important for improving the SWAT model performance in terms of estimating terrestrial water and energy balance.
AB - The Soil and Water Assessment Tool (SWAT) model has been widely applied for simulating the water cycle and quantifying the influence of climate change and anthropogenic activities on hydrological processes. A major uncertainty of SWAT stems from the poor representation of vegetation dynamics due to the use of a simplistic vegetation growth and development module. Using long-term remote sensing-based phenological data, the SWAT model's vegetation module was improved by adding a dynamic growth start date and the dynamic heat requirement for vegetation growth rather than using constant values. The new SWAT model was verified in the Han River basin, China, and found its performance was much improved in comparison with that of the original SWAT model. Specifically, the accuracy of the leaf area index (LAI) simulation improved notably (coefficient of determination (R2) increased by 0.193, Nash–Sutcliffe Efficiency (NSE) increased by 0.846, and percent bias decreased by 42.18 %), and that of runoff simulation improved modestly (R2 increased by 0.05 and NSE was similar). Additionally, it is found that the original SWAT model substantially underestimated evapotranspiration (Penman-Monteith method) in comparison with the new SWAT model (65.09 mm (or 22.17 %) for forests, 92.27 mm (or 32 %) for orchards, and 96.16 mm (or 36.4 %) for farmland), primarily due to the inaccurate representation of LAI dynamics. Our results suggest that an accurate representation of phenological dates in the vegetation growth module is important for improving the SWAT model performance in terms of estimating terrestrial water and energy balance.
KW - LAI simulation
KW - Runoff
KW - SWAT modification
KW - Vegetation phenology
U2 - 10.1016/j.jhydrol.2022.128817
DO - 10.1016/j.jhydrol.2022.128817
M3 - Journal article
AN - SCOPUS:85145552821
VL - 616
JO - Journal of Hydrology
JF - Journal of Hydrology
SN - 0022-1694
M1 - 128817
ER -
ID: 332934904