Resource Name |
Lateral flow thresholds for aspen forested hillslopes on the Western Boreal Plain, Alberta, Canada |
Unique File Number |
396 |
Information Type |
applied Research |
Surface Water |
A |
Aquatic Ecosystem |
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Groundwater |
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Groundwater & Surface Water |
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Management for Natural & Industrial Hazards |
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Strengths |
developed quantitative runoff thresholds using irrigation experiments |
Limitations |
applicability of results through space is unclear |
Challenges |
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Outstanding Research Questions |
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Outstanding Research Questions |
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Information Subtype |
boreal hydrology |
Organization |
University of Alberta |
Resource Name |
Redding, TE and Devito, KL. 2008. Lateral flow thresholds for aspen forested hillslopes on the Western Boreal Plain, Alberta, Canada. Hydrological Processes 22: 4287-4300 |
Resource Purpose |
To predict the long-term sustainability of water resources on the Boreal Plain region of northern Alberta, it is critical to understand when hillslopes generate runoff and connect with surface waters. The sub-humid climate (P ≤ ET) and deep glacial sediments of this region result in large available soil storage capacity relative to moisture surpluses or deficits, leading to threshold-dependent rainfall-runoff relationships. Rainfall simulation experiments were conducted using large magnitude and high intensity applications to examine the thresholds in precipitation and soil moisture that are necessary to generate lateral flow from hillslope runoff plots representative of Luvisolic soils and an aspen canopy. Two adjacent plots (areas of 2·95 and 3·4 m2) of contrasting antecedent moisture conditions were examined; one had tree root uptake excluded for two months to increase soil moisture content, while the second plot allowed tree uptake over the growing season resulting in drier soils. Vertical flow as drainage and soil moisture storage dominated the water balances of both plots. Greater lateral flow occurred from the plot with higher antecedent moisture content. Results indicate that a minimum of 15–20 mm of rainfall is required to generate lateral flow, and only after the soils have been wetted to a depth of 0·75 m (C-horizon). The depth and intensity of rainfall events that generated runoff > 1 mm have return periods of 25 years or greater and, when combined with the need for wet antecendent conditions, indicate that lateral flow generation on these hillslopes will occur infrequently. |
Type of Information |
article |
How does this help decision making? |
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Program Status |
complete |
NE Coverage |
boreal plains |
Drinking Water |
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Ecosystem |
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Fish |
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Groundwater |
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Public Safety |
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SW Quality |
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SW Quantity |
y |
Link |
http://onlinelibrary.wiley.com/doi/10.1002/hyp.7038/abstract |
Text Query |
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Google Earth |
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iMap Path Link |
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Spatial Metadata |
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Map |
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Contact Email |
[email protected] |