Title A spatially explicit hydro-ecological modeling framework (BEPS-TerrainLab V2.0); model description and test in a boreal ecosystem in eastern North America
Author Govind, A.; Chen, J.M.; Margolis, H.; Ju Weimin; Sonnentag, O.; Giasson, M.
Author Affil Govind, A., University of Toronto, Department of Geography, Toronto, ON, Canada. Other: Université Laval, Canada; Nanjing University, China; University of California, Berkeley
Source Journal of Hydrology, 367(3-4), p.200- 216, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0022-1694
Publication Date Apr. 15, 2009
Notes In English. Based on Publisher- supplied data; includes appendices GeoRef Acc. No: 307720
Index Terms computer applications; ecology; ecosystems; ground water; hydrology; soils; surface waters; topography; unfrozen water content; watersheds; Canada--Eastern Canada; North America; BEPS-TerrainLab V2.0 model; boreal environment; Canada; case studies; coupling; data processing; digital simulation; Eastern Canada; forests; humid environment; numerical models; preferential flow; surface water; terrestrial environment; water content
Abstract A spatially explicit, process-based hydro- ecological model, BEPS-TerrainLab V2.0, was developed to improve the representation of ecophysiological, hydro-ecological and biogeochemical processes of boreal ecosystems in a tightly coupled manner. Several processes unique to boreal ecosystems were implemented including the sub-surface lateral water fluxes, stratification of vegetation into distinct layers for explicit ecophysiological representation, inclusion of novel spatial upscaling strategies and biogeochemical processes. To account for preferential water fluxes common in humid boreal ecosystems, a novel scheme was introduced based on laboratory analyses. Leaf- scale ecophysiological processes were upscaled to canopy-scale by explicitly considering leaf physiological conditions as affected by light and water stress. The modified model was tested with 2 years of continuous measurements taken at the Eastern Old Black Spruce Site of the Fluxnet-Canada Research Network located in a humid boreal watershed in eastern Canada. Comparison of the simulated and measured ET, water-table depth (WTD), volumetric soil water content (VSWC) and gross primary productivity (GPP) revealed that BEPS-TerrainLab V2.0 simulates hydro-ecological processes with reasonable accuracy. The model was able to explain 83% of the ET, 92% of the GPP variability and 72% of the WTD dynamics. The model suggests that in humid ecosystems such as eastern North American boreal watersheds, topographically driven sub-surface baseflow is the main mechanism of soil water partitioning which significantly affects the local-scale hydrological conditions.
URL http://hdl.handle.net/10.1016/j.jhydrol.2009.01.006
Publication Type journal article
Record ID 65004742