DOI: 10.5194/hess-20-4061-2016
Scopus记录号: 2-s2.0-84990828181
论文题名: Multiresponse modeling of variably saturated flow and isotope tracer transport for a hillslope experiment at the Landscape Evolution Observatory
作者: Scudeler C ; , Pangle L ; , Pasetto D ; , Niu G ; -Y ; , Volkmann T ; , Paniconi C ; , Putti M ; , Troch P
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 10 起始页码: 4061
结束页码: 4078
语种: 英语
Scopus关键词: Observatories
; Orbits
; Parameterization
; Seepage
; Soils
; Solute transport
; Advection-dispersion equation
; Multiresponse modeling
; Multivariate observations
; Physically based modeling
; Process representation
; Soil hydraulic parameters
; Three dimensional finite element model
; Variably saturated flow
; Finite element method
; deuterium
; finite element method
; hillslope
; hydrochemistry
; hydrogeology
; hydrological modeling
; hydrological response
; landscape evolution
; seepage
; unsaturated flow
; water content
英文摘要: This paper explores the challenges of model parameterization and process representation when simulating multiple hydrologic responses from a highly controlled unsaturated flow and transport experiment with a physically based model. The experiment, conducted at the Landscape Evolution Observatory (LEO), involved alternate injections of water and deuterium-enriched water into an initially very dry hillslope. The multivariate observations included point measures of water content and tracer concentration in the soil, total storage within the hillslope, and integrated fluxes of water and tracer through the seepage face. The simulations were performed with a three-dimensional finite element model that solves the Richards and advection-dispersion equations. Integrated flow, integrated transport, distributed flow, and distributed transport responses were successively analyzed, with parameterization choices at each step supported by standard model performance metrics. In the first steps of our analysis, where seepage face flow, water storage, and average concentration at the seepage face were the target responses, an adequate match between measured and simulated variables was obtained using a simple parameterization consistent with that from a prior flow-only experiment at LEO. When passing to the distributed responses, it was necessary to introduce complexity to additional soil hydraulic parameters to obtain an adequate match for the point-scale flow response. This also improved the match against point measures of tracer concentration, although model performance here was considerably poorer. This suggests that still greater complexity is needed in the model parameterization, or that there may be gaps in process representation for simulating solute transport phenomena in very dry soils. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78717
Appears in Collections: 气候变化事实与影响
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作者单位: Institut National de la Recherche Scientifique, Centre Eau Terre Environnement, Université du Québec, Quebec City, Canada; Department of Mathematics, University of Padua, Padua, Italy; Department of Geosciences, Georgia State University, Atlanta, United States; Laboratory of Ecohydrology, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Biosphere Earth Science, University of Arizona, Tucson, United States; Department of Hydrology and Water Resources, University of Arizona, Tucson, United States
Recommended Citation:
Scudeler C,, Pangle L,, Pasetto D,et al. Multiresponse modeling of variably saturated flow and isotope tracer transport for a hillslope experiment at the Landscape Evolution Observatory[J]. Hydrology and Earth System Sciences,2016-01-01,20(10)