globalchange  > 气候变化与战略
DOI: 10.5194/hess-24-2895-2020
论文题名:
On the shape of forward transit time distributions in low-order catchments
作者: Heidbüchel I.; Yang J.; Musolff A.; Troch P.; Ferré T.; Fleckenstein J.H.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2020
卷: 24, 期:6
起始页码: 2895
结束页码: 2920
语种: 英语
Scopus关键词: Hydraulic conductivity ; Normal distribution ; Runoff ; Soil moisture ; Antecedent soil moisture ; Dimensionless number ; Forward transit time ; Log-normal distribution ; Precipitation events ; Probability functions ; Soil hydraulic conductivity ; Transit-time distributions ; Catchments ; bedrock ; breakthrough curve ; catchment ; hydraulic conductivity ; precipitation (climatology) ; soil moisture ; subsurface flow ; tracer ; transition zone
英文摘要: Transit time distributions (TTDs) integrate information on timing, amount, storage, mixing and flow paths of water and thus characterize hydrologic and hydrochemical catchment response unlike any other descriptor. Here, we simulate the shape of TTDs in an idealized low-order catchment and investigate whether it changes systematically with certain catchment and climate properties. To this end, we used a physically based, spatially explicit 3-D model, injected tracer with a precipitation event and recorded the resulting forward TTDs at the outlet of a small (ĝˆ1/46000 m2) catchment for different scenarios. We found that the TTDs can be subdivided into four parts: (1) early part - controlled by soil hydraulic conductivity and antecedent soil moisture content, (2) middle part - a transition zone with no clear pattern or control, (3) later part - influenced by soil hydraulic conductivity and subsequent precipitation amount, and (4) very late tail of the breakthrough curve - governed by bedrock hydraulic conductivity. The modeled TTD shapes can be predicted using a dimensionless number: higher initial peaks are observed if the inflow of water to a catchment is not equal to its capacity to discharge water via subsurface flow paths, and lower initial peaks are connected to increasing available storage. In most cases the modeled TTDs were humped with nonzero initial values and varying weights of the tails. Therefore, none of the best-fit theoretical probability functions could describe the entire TTD shape exactly. Still, we found that generally gamma and log-normal distributions work better for scenarios of low and high soil hydraulic conductivity, respectively. © 2020 Copernicus GmbH. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162674
Appears in Collections:气候变化与战略

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作者单位: Heidbüchel, I., Department of Hydrogeology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, 04318, Germany; Yang, J., Department of Hydrogeology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, 04318, Germany; Musolff, A., Department of Hydrogeology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, 04318, Germany; Troch, P., Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, 85721, United States; Ferré, T., Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, 85721, United States; Fleckenstein, J.H., Department of Hydrogeology, Helmholtz Centre for Environmental Research - UFZ, Leipzig, 04318, Germany

Recommended Citation:
Heidbüchel I.,Yang J.,Musolff A.,et al. On the shape of forward transit time distributions in low-order catchments[J]. Hydrology and Earth System Sciences,2020-01-01,24(6)
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