DOI: 10.5194/hess-21-23-2017
Scopus记录号: 2-s2.0-85008671043
论文题名: Towards a tracer-based conceptualization of meltwater dynamics and streamflow response in a glacierized catchment
作者: Penna D ; , Engel M ; , Bertoldi G ; , Comiti F
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 1 起始页码: 23
结束页码: 41
语种: 英语
Scopus关键词: Dynamics
; Electric conductivity
; Groundwater
; Isotopes
; Rivers
; Runoff
; Snow melting systems
; Stream flow
; Electrical conductivity
; Environmental tracers
; Isotopic composition
; Shallow groundwater
; Sources of uncertainty
; Spatial and temporal patterns
; Stable isotopes of water
; Streamflow response
; Catchments
; catchment
; conceptual framework
; electrical conductivity
; glacial hydrology
; glacier dynamics
; hydrodynamics
; isotopic composition
; meltwater
; runoff
; snowmelt
; streamflow
; tracer
; Alps
; Bolzano
; Italy
; Saldur Basin
; Trentino-Alto Adige
英文摘要: Multiple water sources and the physiographic heterogeneity of glacierized catchments hamper a complete conceptualization of runoff response to meltwater dynamics. In this study, we used environmental tracers (stable isotopes of water and electrical conductivity) to obtain new insight into the hydrology of glacierized catchments, using the Saldur River catchment, Italian Alps, as a pilot site. We analysed the controls on the spatial and temporal patterns of the tracer signature in the main stream, its selected tributaries, shallow groundwater, snowmelt and glacier melt over a 3-year period. We found that stream water electrical conductivity and isotopic composition showed consistent patterns in snowmelt-dominated periods, whereas the streamflow contribution of glacier melt altered the correlations between the two tracers. By applying two- and three-component mixing models, we quantified the seasonally variable proportion of groundwater, snowmelt and glacier melt at different locations along the stream. We provided four model scenarios based on different tracer signatures of the end-members; the highest contributions of snowmelt to streamflow occurred in late spring–early summer and ranged between 70 and 79%, according to different scenarios, whereas the largest inputs by glacier melt were observed in mid-summer, and ranged between 57 and 69%. In addition to the identification of the main sources of uncertainty, we demonstrated how a careful sampling design is critical in order to avoid underestimation of the meltwater component in streamflow. The results of this study supported the development of a conceptual model of streamflow response to meltwater dynamics in the Saldur catchment, which is likely valid for other glacierized catchments worldwide. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79310
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Agricultural, Food and Forestry Systems, University of Florence, via San Bonaventura 13, Florence, Italy; Faculty of Science and Technology, Free University of Bozen-Bolzano, Piazza dell' Università 5, Bolzano, Italy; Institute for Alpine Environment, EURAC - European Academy of Bolzano/Bozen, viale Druso 1, Bolzano, Italy
Recommended Citation:
Penna D,, Engel M,, Bertoldi G,et al. Towards a tracer-based conceptualization of meltwater dynamics and streamflow response in a glacierized catchment[J]. Hydrology and Earth System Sciences,2017-01-01,21(1)