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Simulation of Water and Energy Fluxes in an Old-Growth Seasonal Temperate Rain Forest Using the Simultaneous Heat and Water (SHAW) Model

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https://ir.library.oregonstate.edu/concern/articles/r207tq90h

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  • In the Pacific Northwest (PNW), concern about the impacts of climate and land cover change on water resources and flood-generating processes emphasizes the need for a mechanistic understanding of the interactions between forest canopies and hydrologic processes. Detailed measurements during the 1999 and 2000 hydrologic years were used to modify the Simultaneous Heat and Water (SHAW) model for application in forested systems. Major changes to the model include improved representation of rainfall interception and stomatal conductance dynamics. The model was developed for the 1999 hydrologic year and tested for the 2000 hydrologic year without modification of the site parameters. The model effectively simulated throughfall, soil water content profiles, and shallow soil temperatures for both years. The largest discrepancies between soil moisture and temperature were observed during periods of discontinuous snow cover due to spatial variability that was not explicitly simulated by the model. Soil warming at bare locations was delayed until most of the snow cover ablated because of the large heat sink associated with the residual snow patches. During the summer, simulated transpiration decreased from a maximum monthly mean of 2.2 mm day⁻¹ in July to 1.3 mm day⁻¹ in September as a result of decreasing soil moisture and declining net radiation. The results indicate that a relatively simple representation of the vegetation canopy can accurately simulate seasonal hydrologic fluxes in this environment, except during periods of discontinuous snow cover.
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  • Link, Timothy E., Gerald N. Flerchinger, Mike Unsworth, Danny Marks, 2004: Simulation of Water and Energy Fluxes in an Old-Growth Seasonal Temperate Rain Forest Using the Simultaneous Heat and Water (SHAW) Model. Journal of Hydrometeorology, 5, 443–457.
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  • 5
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  • 3
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  • Support for this research was provided by the Office of Science, Biological and Environmental Research Program (BER), U.S. Department of Energy, through the Western Regional Center (WESTGEC) of the National Institute for Global Environmental Change (NIGEC) under Cooperative Agreement DEFC03- 90ER61010. Additional support was provided by the USDA Forest Service and the Agricultural Research Service, Northwest Watershed Research Center. Meteorological data were collected by the WRCCRF, which is a cooperative educational and scientific venture located on the Wind River Experimental Forest and supported by the University of Washington College of Forest Resources, the USDA Forest Service Pacific Northwest Research Station, and the Gifford Pinchot National Forest.
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