Publication: Subsurface lateral flow generation in aspen and conifer-dominated hillslopes of a first order catchment in northern Utah
Issued Date
2011-04-30
Resource Type
ISSN
10991085
08856087
08856087
DOI
Other identifier(s)
2-s2.0-79954564473
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Mahidol University
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SCOPUS
Bibliographic Citation
Hydrological Processes. Vol.25, No.9 (2011), 1407-1417
Suggested Citation
Amy R. Burke, Tamao Kasahara Subsurface lateral flow generation in aspen and conifer-dominated hillslopes of a first order catchment in northern Utah. Hydrological Processes. Vol.25, No.9 (2011), 1407-1417. doi:10.1002/hyp.7906 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11928
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Title
Subsurface lateral flow generation in aspen and conifer-dominated hillslopes of a first order catchment in northern Utah
Author(s)
Abstract
Mountain headwater catchments in the semi-arid Intermountain West are important sources of surface water because these high elevations receive more precipitation than neighboring lowlands. This study examined subsurface runoff in two hillslopes, one aspen dominated, the other conifer dominated, adjacent to a first order stream in snow-driven northern Utah. Snow accumulation, soil moisture, trenchflow and streamflow were examined in hillslopes and their adjacent stream. Snow water equivalents (SWEs) were greater under aspen stands compared to conifer, the difference increasing with higher annual precipitation. Semi-variograms of shallow spatial soil moisture patterns and transects of continuous soil moisture showed no increase in soil moisture downslope, suggesting the absence of subsurface flow in shallow (∼12 cm) soil layers of either vegetation type. However, a clear threshold relationship between soil moisture and streamflow indicated hillslope-stream connectivity, deeper within the soil profile. Subsurface flow was detected at ∼50 cm depth, which was sustained for longer in the conifer hillslope. Soil profiles under the two vegetation types varied, with deep aspen soils having greater water storage capacity than shallow rocky conifer soils. Though SWEs were less under the conifers, the soil profile had less water storage capacity and produced more subsurface lateral flow during the spring snowmelt. © 2010 John Wiley & Sons, Ltd.