DOI: 10.5194/hess-18-1503-2014
Scopus记录号: 2-s2.0-84899408369
论文题名: Understanding uncertainties when inferring mean transit times of water trough tracer-based lumped-parameter models in Andean tropical montane cloud forest catchments
作者: Timbe E ; , Windhorst D ; , Crespo P ; , Frede H ; -G ; , Feyen J ; , Breuer L
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 4 起始页码: 1503
结束页码: 1523
语种: 英语
Scopus关键词: Catchments
; Convolution
; Forestry
; Glues
; Gluing
; Isotopes
; Pistons
; Rain
; Runoff
; Soil moisture
; Convolution methods
; Generalized likelihood uncertainty estimation
; Lumped parameter models
; Mean transit time
; Parameter identifiability
; Stable water isotopes
; Transit-time distributions
; Tropical montane cloud forest
; Reservoirs (water)
; baseflow
; cloud forest
; forested catchment
; soil horizon
; tracer
; trough
; uncertainty analysis
; Forestry
; Glue
; Gluing
; Isotopes
; Moisture
; Pistons
; Rain
; Reservoirs
; Runoff
; Soil
; Andes
; Ecuador
英文摘要: Weekly samples from surface waters, springs, soil water and rainfall were collected in a 76.9 km2 mountain rain forest catchment and its tributaries in southern Ecuador. Time series of the stable water isotopes δ18O and δ2H were used to calculate mean transit times (MTTs) and the transit time distribution functions (TTDs) solving the convolution method for seven lumped-parameter models. For each model setup, the generalized likelihood uncertainty estimation (GLUE) methodology was applied to find the best predictions, behavioral solutions and parameter identifiability. For the study basin, TTDs based on model types such as the linear-piston flow for soil waters and the exponential-piston flow for surface waters and springs performed better than more versatile equations such as the gamma and the two parallel linear reservoirs. Notwithstanding both approaches yielded a better goodness of fit for most sites, but with considerable larger uncertainty shown by GLUE. Among the tested models, corresponding results were obtained for soil waters with short MTTs (ranging from 2 to 9 weeks). For waters with longer MTTs differences were found, suggesting that for those cases the MTT should be based at least on an intercomparison of several models. Under dominant baseflow conditions long MTTs for stream water ≥ 2 yr were detected, a phenomenon also observed for shallow springs. Short MTTs for water in the top soil layer indicate a rapid exchange of surface waters with deeper soil horizons. Differences in travel times between soils suggest that there is evidence of a land use effect on flow generation. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78264
Appears in Collections: 气候变化事实与影响
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作者单位: Departamento de Recursos Hídricos y Ciencias Ambientales, Universidad de Cuenca, Cuenca, Ecuador; Institute for Landscape Ecology and Resources Management (ILR), Research Centre for Bio Systems, Land Use and Nutrition (IFZ), Justus-Liebig-Universität Gießen, Giessen, Germany; Facultad de Ciencias Agropecuarias, Universidad de Cuenca, Cuenca, Ecuador
Recommended Citation:
Timbe E,, Windhorst D,, Crespo P,et al. Understanding uncertainties when inferring mean transit times of water trough tracer-based lumped-parameter models in Andean tropical montane cloud forest catchments[J]. Hydrology and Earth System Sciences,2014-01-01,18(4)