globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-18-3681-2014
Scopus记录号: 2-s2.0-84907483635
论文题名:
Hillslope-scale experiment demonstrates the role of convergence during two-step saturation
作者: Gevaert A; I; , Teuling A; J; , Uijlenhoet R; , DeLong S; B; , Huxman T; E; , Pangle L; A; , Breshears D; D; , Chorover J; , Pelletier J; D; , Saleska S; R; , Zeng X; , Troch P; A
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期:9
起始页码: 3681
结束页码: 3692
语种: 英语
Scopus关键词: bedrock ; Biosphere 2 ; hillslope ; moisture content ; overland flow ; rainfall ; saturation ; sensor ; soil moisture ; subsurface flow ; vadose zone ; water table
英文摘要: Subsurface flow and storage dynamics at hillslope scale are difficult to ascertain, often in part due to a lack of sufficient high-resolution measurements and an incomplete understanding of boundary conditions, soil properties, and other environmental aspects. A continuous and extreme rainfall experiment on an artificial hillslope at Biosphere 2's Landscape Evolution Observatory (LEO) resulted in saturation excess overland flow and gully erosion in the convergent hillslope area. An array of 496 soil moisture sensors revealed a two-step saturation process. First, the downward movement of the wetting front brought soils to a relatively constant but still unsaturated moisture content. Second, soils were brought to saturated conditions from below in response to rising water tables. Convergent areas responded faster than upslope areas, due to contributions from lateral subsurface flow driven by the topography of the bottom boundary, which is comparable to impermeable bedrock in natural environments. This led to the formation of a groundwater ridge in the convergent area, triggering saturation excess runoff generation. This unique experiment demonstrates, at very high spatial and temporal resolution, the role of convergence on subsurface storage and flow dynamics. The results bring into question the representation of saturation excess overland flow in conceptual rainfall-runoff models and land-surface models, since flow is gravity-driven in many of these models and upper layers cannot become saturated from below. The results also provide a baseline to study the role of the coevolution of ecological and hydrological processes in determining landscape water dynamics during future experiments in LEO. © Author(s) 2014.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78129
Appears in Collections:气候变化事实与影响

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作者单位: Hydrology and Quantitative Water Management Group, Wageningen University, Wageningen, Netherlands; Biosphere 2 - College of Science, University of Arizona, Tucson, AZ, United States; Department of Ecology and Evolutionary Biology, University of California, Irvine, CA, United States; School of Natural Resources and the Environment, University of Arizona, Tucson, AZ, United States; Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ, United States; Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, United States; Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, United States; Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ, United States; Department of Earth Sciences, VU University, Amsterdam, Netherlands; US Geological Survey, Menlo Park, CA, United States

Recommended Citation:
Gevaert A,I,, Teuling A,et al. Hillslope-scale experiment demonstrates the role of convergence during two-step saturation[J]. Hydrology and Earth System Sciences,2014-01-01,18(9)
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