DOI: 10.5194/hess-19-1153-2015
Scopus记录号: 2-s2.0-84923872989
论文题名: Sampling frequency trade-offs in the assessment of mean transit times of tropical montane catchment waters under semi-steady-state conditions
作者: Timbe E ; , Windhorst D ; , Celleri R ; , Timbe L ; , Crespo P ; , Frede H ; -G ; , Feyen J ; , Breuer L
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 3 起始页码: 1153
结束页码: 1168
语种: 英语
Scopus关键词: Distribution functions
; Economic and social effects
; Forecasting
; Isotopes
; Pistons
; Precipitation (meteorology)
; Runoff
; Soil moisture
; Lumped parameter distribution
; Optimal sampling frequency
; Precipitation events
; Sampling frequencies
; Sampling resolution
; Stable water isotopes
; Steady-state condition
; Tropical montane cloud forest
; Catchments
; cloud forest
; fieldwork
; montane forest
; precipitation (climatology)
; sampling
; soil water
; steady-state equilibrium
; trade-off
英文摘要: Precipitation event samples and weekly based water samples from streams and soils were collected in a tropical montane cloud forest catchment for 2 years and analyzed for stable water isotopes in order to understand the effect of sampling frequency in the performance of three lumped-parameter distribution functions (exponential-piston flow, linear-piston flow and gamma) which were used to estimate mean transit times of waters. Precipitation data, used as input function for the models, were aggregated to daily, weekly, bi-weekly, monthly and bi-monthly sampling resolutions, while analyzed frequencies for outflows went from weekly to bi-monthly. By using different scenarios involving diverse sampling frequencies, this study reveals that the effect of lowering the sampling frequency depends on the water type. For soil waters, with transit times on the order of few weeks, there was a clear trend of over predictions. In contrast, the trend for stream waters, which have a more damped isotopic signal and mean transit times on the order of 2 to 4 years, was less clear and showed a dependence on the type of model used. The trade-off to coarse data resolutions could potentially lead to misleading conclusions on how water actually moves through the catchment, notwithstanding that these predictions could reach better fitting efficiencies, fewer uncertainties, errors and biases. For both water types an optimal sampling frequency seems to be 1 or at most 2 weeks. The results of our analyses provide information for the planning of future fieldwork in similar Andean or other catchments. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78588
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
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; Facultad de Ciencias Químicas, Universidad de Cuenca, Cuenca, Ecuador
Recommended Citation:
Timbe E,, Windhorst D,, Celleri R,et al. Sampling frequency trade-offs in the assessment of mean transit times of tropical montane catchment waters under semi-steady-state conditions[J]. Hydrology and Earth System Sciences,2015-01-01,19(3)