A REVISED VERSION OF PnET-II TO SIMULATE THE HYDROLOGIC CYCLE IN SOUTHEASTERN FORESTED AREAS

The PnET-II model uses hydroclimatic data on maximum and minimum temperatures, precipitation, and solar radiation, together with vegetation and soil parameters, to produce estimates of net primary productivity, evapotranspiration (ET), and runoff on a monthly time step for forested areas. In this st...

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Veröffentlicht in:Journal of the American Water Resources Association 2002-02, Vol.38 (1), p.79-89
Hauptverfasser: Liang, Yiguo, Durrans, S. Rocky, Lightsey, Trey
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container_title Journal of the American Water Resources Association
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creator Liang, Yiguo
Durrans, S. Rocky
Lightsey, Trey
description The PnET-II model uses hydroclimatic data on maximum and minimum temperatures, precipitation, and solar radiation, together with vegetation and soil parameters, to produce estimates of net primary productivity, evapotranspiration (ET), and runoff on a monthly time step for forested areas. In this study, the PnET-II model was employed to simulate the hydrologic cycle for 17 Southeastern eight-digit hydrologic unit code (HUC) watersheds dominated by evergreen or deciduous tree species. Based on these control experiments, model biases were quantified and tentative revision schemes were introduced. Revisions included: (1) replacing the original single soil layer with three soil layers in the water balance routine; (2) introducing calibrating factors to rectify the phenomenon of overestimation of ET in spring and early summer months; (3) parameterizing proper values of growing degree days for trees located in different climate zones; and (4) adjusting the parameter of fast-flow (overland flow) fraction based on antecedent moisture condition and precipitation intensity. The revised PnET-II model, called PnET-II3SL in this work, substantially improved runoff simulations for the 17 selected experimental sites, and therefore may offer a more powerful tool to address issues in water resources management.
doi_str_mv 10.1111/j.1752-1688.2002.tb01536.x
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Rocky ; Lightsey, Trey</creator><creatorcontrib>Liang, Yiguo ; Durrans, S. Rocky ; Lightsey, Trey</creatorcontrib><description>The PnET-II model uses hydroclimatic data on maximum and minimum temperatures, precipitation, and solar radiation, together with vegetation and soil parameters, to produce estimates of net primary productivity, evapotranspiration (ET), and runoff on a monthly time step for forested areas. In this study, the PnET-II model was employed to simulate the hydrologic cycle for 17 Southeastern eight-digit hydrologic unit code (HUC) watersheds dominated by evergreen or deciduous tree species. Based on these control experiments, model biases were quantified and tentative revision schemes were introduced. 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identifier ISSN: 1093-474X
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1752-1688
language eng
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source Wiley Online Library Journals
subjects climate variability
Earth sciences
Earth, ocean, space
Exact sciences and technology
hydrologic cycle
Hydrology
Hydrology. Hydrogeology
PnET-II model
PnET-II3SL model
runoff
title A REVISED VERSION OF PnET-II TO SIMULATE THE HYDROLOGIC CYCLE IN SOUTHEASTERN FORESTED AREAS
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