Hydrologic response of a steep, unchanneled valley to natural and applied rainfall
David R. Montgomery,William E. Dietrich,Raymond Torres,Suzanne P. Anderson,John T. Heffner,Keith Loague +5 more
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This article showed that a significant proportion of storm runoffflows through near-surface bedrock and illustrate the importance of shallow bedrockflow in pore pressure development in the overlying colluvial soil.Abstract:
Observations from natural rain storms and sprinkling experiments at a steep zero-order catchment in the Oregon Coast Range demonstrate the importance offlow through near-surface bedrock on runoff generation and pore pressure development in shallow colluvial soils. Sprinkling experiments, involving irrigation of the entire 860 m 2 catchment at average intensities of 1.5 and 3.0 mm/h, permitted detailed observation of runoff and the development of subsurface saturation under controlled conditions. A weir installed to collectflow through the colluvium at the base of the catchment recovered runoff equal to one third to one half of the precipitation rate during quasi-steady irrigation. Three key observations demonstrate that a significant proportion of storm runoffflows through near-surface bedrock and illustrate the importance of shallow bedrockflow in pore pressure development in the overlying colluvial soil: (1) greater discharge recovery during both the experiments and natural rainfall at a weir installed approximately 15 m downslope of the weir at the base of the catchment, (2) spatially discontinuous patterns of positive pressure head in the colluvium during steady sprinkling, and (3) local development of upward head gradients associated withflow from weathered rock into the overlying colluvium during high-intensity rainfall. Data from natural storms also show that smaller storms produce no significant runoff or piezometric response and point to a critical intensity-duration rainfall to overcome vadose zone storage. Together these observations highlight the role of interaction betweenflow in colluvium and near- surface bedrock in governing patterns of soil saturation, runoff production, and positive pore pressures.read more
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Landslide triggering by rain infiltration
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Evidence for nonlinear, diffusive sediment transport on hillslopes and implications for landscape morphology
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Kelsey Jencso,Brian L. McGlynn,Michael N. Gooseff,Steven M. Wondzell,Kenneth E. Bencala,Lucy Marshall +5 more
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The variability of root cohesion as an influence on shallow landslide susceptibility in the Oregon Coast Range
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References
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A physically based, variable contributing area model of basin hydrology
Mike Kirkby,Keith Beven +1 more
TL;DR: In this paper, a hydrological forecasting model is presented that attempts to combine the important distributed effects of channel network topology and dynamic contributing areas with the advantages of simple lumped parameter basin models.
Journal ArticleDOI
A physically based, variable contributing area model of basin hydrology / Un modèle à base physique de zone d'appel variable de l'hydrologie du bassin versant
Keith Beven,Mike Kirkby +1 more
TL;DR: In this paper, a hydrological forecasting model is presented that combines the important distributed effects of channel network topology and dynamic contributing areas with the advantages of simple luminescence.
Book
Biogeochemistry of a Forested Ecosystem
TL;DR: In this article, Biogeochemistry of a forested ecosystem, Biogeochemical properties of forested ecosystems, and biogeochemistry in forested environments, the authors present a biogeochemical model of forest ecosystems.
Journal ArticleDOI
The Rôle of infiltration in the hydrologic cycle
TL;DR: Patten and Gallagher as mentioned in this paper confine the use of percolation to the free downward flow by gravity of water in the zone of aeration, a process for which a distinctive term is needed.
Journal ArticleDOI
A physically based model for the topographic control on shallow landsliding
TL;DR: In this paper, a model for the topographic influence on shallow landslide initiation is developed by coupling digital terrain data with near-surface through flow and slope stability models, which predicts the degree of soil saturation in response to a steady state rainfall for topographic elements defined by the intersection of contours and flow tube boundaries.