DOI: 10.5194/hess-20-5015-2016
Scopus记录号: 2-s2.0-85007246535
论文题名: The importance of snowmelt spatiotemporal variability for isotope-based hydrograph separation in a high-elevation catchment
作者: Schmieder J ; , Hanzer F ; , Marke T ; , Garvelmann J ; , Warscher M ; , Kunstmann H ; , Strasser U
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 12 起始页码: 5015
结束页码: 5033
语种: 英语
Scopus关键词: Catchments
; Digital storage
; Isotopes
; Runoff
; Scales (weighing instruments)
; Separation
; Snow
; Stream flow
; Catchment scale
; Hydrograph separation
; Isotopic composition
; Isotopic signatures
; Seasonal snow cover
; Spatial variations
; Spatiotemporal variability
; Weighting methods
; Snow melting systems
; catchment
; elevation
; hydrographic survey
; isotopic composition
; oxygen isotope
; snowmelt
; spatial variation
; streamflow
; temporal variation
; water storage
英文摘要: Seasonal snow cover is an important temporary water storage in high-elevation regions. Especially in remote areas, the available data are often insufficient to accurately quantify snowmelt contributions to streamflow. The limited knowledge about the spatiotemporal variability of the snowmelt isotopic composition, as well as pronounced spatial variation in snowmelt rates, leads to high uncertainties in applying the isotope-based hydrograph separation method. The stable isotopic signatures of snowmelt water samples collected during two spring 2014 snowmelt events at a north- and a south-facing slope were volume weighted with snowmelt rates derived from a distributed physics-based snow model in order to transfer the measured plot-scale isotopic composition of snowmelt to the catchment scale. The observed δ18O values and modeled snowmelt rates showed distinct inter- and intra-event variations, as well as marked differences between north- and south-facing slopes. Accounting for these differences, two-component isotopic hydrograph separation revealed snowmelt contributions to streamflow of 35 ± 3 and 75 ± 14 % for the early and peak melt season, respectively. These values differed from those determined by formerly used weighting methods (e.g., using observed plot-scale melt rates) or considering either the north- or south-facing slope by up to 5 and 15 %, respectively. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78662
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Geography, University of Innsbruck, Innsbruck, Austria; Institute of Meteorology and Climate Research - Atmospheric Environmental Research, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany
Recommended Citation:
Schmieder J,, Hanzer F,, Marke T,et al. The importance of snowmelt spatiotemporal variability for isotope-based hydrograph separation in a high-elevation catchment[J]. Hydrology and Earth System Sciences,2016-01-01,20(12)