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DOI	10.5194/hess-24-849-2020
	Beyond binary baseflow separation: a delayed-flow index for multiple streamflow contributions
	Stoelzle M.; Schuetz T.; Weiler M.; Stahl K.; Tallaksen L.M.
发表日期	2020
ISSN	1027-5606
起始页码	849
结束页码	867
卷号	24 期号:2
英文摘要	Understanding components of the total streamflow is important to assess the ecological functioning of rivers. Binary or two-component separation of streamflow into a quick and a slow (often referred to as baseflow) component are often based on arbitrary choices of separation parameters and also merge different delayed components into one baseflow component and one baseflow index (BFI). As streamflow generation during dry weather often results from drainage of multiple sources, we propose to extend the BFI by a delayed-flow index (DFI) considering the dynamics of multiple delayed contributions to streamflow. The DFI is based on characteristic delay curves (CDCs) where the identification of breakpoint (BP) estimates helps to avoid rather subjective separation parameters and allows for distinguishing four types of delayed streamflow contributions. The methodology is demonstrated using streamflow records from a set of 60 mesoscale catchments in Germany and Switzerland covering a pronounced elevation gradient of roughly 3000 m. We found that the quickflow signal often diminishes earlier than assumed by two-component BFI analyses and distinguished a variety of additional flow contributions with delays shorter than 60 d. For streamflow contributions with delays longer than 60 d, we show that the method can be used to assess catchments' water sustainability during dry spells. Colwell's predictability (PT), a measure of streamflow periodicity and sustainability, was applied to attribute the identified delay patterns to dynamic catchment storage. The smallest dynamic storages were consistently found for catchments between approx. 800 and 1800ma.s.l. Above an elevation of 1800m the DFI suggests that seasonal snowpack provides the primary contribution, whereas below 800m groundwater resources are most likely the major streamflow contributions. Our analysis also indicates that dynamic storage in high alpine catchments might be large and is overall not smaller than in lowland catchments. We conclude that the DFI can be used to assess the range of sources forming catchments' storages and to judge the long-term sustainability of streamflow. © Author(s) 2020.
语种	英语
scopus关键词	Catchments; Damage detection; Groundwater; Groundwater resources; Runoff; Sustainable development; Baseflow separations; Ecological functioning; Long-term sustainability; Mesoscale catchments; Primary contribution; Separation parameters; Streamflow generations; Water sustainability; Stream flow; baseflow; catchment; groundwater; index method; parameter estimation; separation; snowpack; streamflow; Germany; Switzerland
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159492
作者单位	Stoelzle, M., Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Schuetz, T., Department of Hydrology, Faculty VI Regional and Environmental Sciences, University of Trier, Trier, Germany; Weiler, M., Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Stahl, K., Faculty of Environment and Natural Resources, University of Freiburg, Freiburg, Germany; Tallaksen, L.M., Department of Geosciences, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Stoelzle M.,Schuetz T.,Weiler M.,et al. Beyond binary baseflow separation: a delayed-flow index for multiple streamflow contributions[J],2020,24(2).
APA	Stoelzle M.,Schuetz T.,Weiler M.,Stahl K.,&Tallaksen L.M..(2020).Beyond binary baseflow separation: a delayed-flow index for multiple streamflow contributions.Hydrology and Earth System Sciences,24(2).
MLA	Stoelzle M.,et al."Beyond binary baseflow separation: a delayed-flow index for multiple streamflow contributions".Hydrology and Earth System Sciences 24.2(2020).