globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-1101-2020
论文题名:
Technical note: An improved discharge sensitivity metric for young water fractions
作者: Gallart F.; Von Freyberg J.; Valiente M.; Kirchner J.W.; Llorens P.; Latron J.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:3
起始页码: 1101
结束页码: 1107
语种: 英语
Scopus关键词: Regression analysis ; Runoff ; Experimental investigations ; Exponential equations ; Exponential type ; Intensive sampling ; Intercomparisons ; Linear regression methods ; Non-linear relationships ; Streamflow generations ; Catchments ; catchment ; discharge ; experimental study ; Mediterranean environment ; outflow ; regression analysis ; sampling ; streamflow
英文摘要: Recent virtual and experimental investigations have shown that the young water fraction Fyw (i.e. the proportion of catchment outflow younger than circa 2-3 months) increases with discharge in most catchments. The discharge sensitivity of Fyw has been defined as the rate of increase in Fyw with increasing discharge (Q) and has been estimated by the linear regression slope between Fyw and Q, hereafter called DS(Q). The combined use of both metrics, Fyw and DS(Q), provides a promising method for catchment intercomparison studies that seek to understand streamflow generation processes. Here we explore the discharge sensitivity of Fyw in the intensively sampled small Mediterranean research catchment Can Vila. Intensive sampling of high flows at Can Vila allows young water fractions to be estimated for the far upper tail of the flow frequency distribution. These young water fractions converge toward 1 at the highest flows, illustrating a conceptual limitation in the linear regression method for estimating DS(Q) as a metric of discharge sensitivity: Fyw cannot grow with discharge indefinitely, since the fraction of young water in discharge can never be larger than 1. Here we propose to quantify discharge sensitivity by the parameter of an exponential-type equation that expresses how Fyw varies with discharge. The exponential parameter (Sd) approximates DS(Q) at moderate discharges where Fyw is well below 1; however, the exponential equation and its discharge sensitivity metric better capture the non-linear relationship between Fyw and Q and are robust with respect to changes in the range of sampled discharges, allowing comparisons between catchments with strongly contrasting flow regimes. © Author(s) 2020.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162769
Appears in Collections:气候变化与战略

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作者单位: Gallart, F., Surface Hydrology and Erosion Group, Department of Geosciences, IDAEA, CSIC, Barcelona, Spain; Von Freyberg, J., Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland; Valiente, M., Geodynamics Department, University of the Basque Country, Leioa, Spain; Kirchner, J.W., Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland; Llorens, P., Surface Hydrology and Erosion Group, Department of Geosciences, IDAEA, CSIC, Barcelona, Spain; Latron, J., Surface Hydrology and Erosion Group, Department of Geosciences, IDAEA, CSIC, Barcelona, Spain

Recommended Citation:
Gallart F.,Von Freyberg J.,Valiente M.,et al. Technical note: An improved discharge sensitivity metric for young water fractions[J]. Hydrology and Earth System Sciences,2020-01-01,24(3)
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