Consequences of mixing assumptions for time-variable travel time distributions

Ype van der Velde, Ingo Heidbüchel, Steve W. Lyon, Lars Nyberg, Allan Rodhe, Kevin Bishop, Peter A Troch

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The current generation of catchment travel time distribution (TTD) research, integrating nearly three decades of work since publication of Water's Journey from Rain to Stream, seeks to represent the full distribution in catchment travel times and its temporal variability. Here, we compare conceptualizations of increasing complexity with regards to mixing of water storages and evaluate how these assumptions influence time-variable TTD estimates for two catchments with contrasting climates: the Gårdsjön catchment in Sweden and the Marshall Gulch catchment in Arizona, USA. Our results highlight that, as long as catchment TTDs cannot be measured directly but need to be inferred from input-output signals of catchments, the inferred catchment TTDs depend strongly on the underlying assumptions of mixing within a catchment. Furthermore, we found that the conceptualization of the evapotranspiration flux strongly influences the inferred travel times of stream discharge. For the wet and forested Gårdsjön catchment in Sweden, we inferred that evapotranspiration most likely resembles a completely mixed sample of the water stored in the catchment; however, for the drier Marshall Gulch catchment in Arizona, evapotranspiration predominantly contained the younger water stored in the catchment. For the Marshall Gulch catchment, this higher probability for young water in evapotranspiration resulted in older water in the stream compared to travel times inferred with assumptions of complete mixing. New observations that focus on the TTD of the evapotranspiration flux and the actual travel time of water through a catchment are necessary to improve identification of mixing and consequently travel times of stream water.

Original languageEnglish (US)
Pages (from-to)3460-3474
Number of pages15
JournalHydrological Processes
Volume29
Issue number16
DOIs
StatePublished - Jul 30 2015

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travel time
catchment
evapotranspiration
water
distribution
forested catchment
water storage

Keywords

  • Catchment hydrology
  • Connectivity
  • Mixing assumptions
  • Travel time distributions

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

van der Velde, Y., Heidbüchel, I., Lyon, S. W., Nyberg, L., Rodhe, A., Bishop, K., & Troch, P. A. (2015). Consequences of mixing assumptions for time-variable travel time distributions. Hydrological Processes, 29(16), 3460-3474. https://doi.org/10.1002/hyp.10372

Consequences of mixing assumptions for time-variable travel time distributions. / van der Velde, Ype; Heidbüchel, Ingo; Lyon, Steve W.; Nyberg, Lars; Rodhe, Allan; Bishop, Kevin; Troch, Peter A.

In: Hydrological Processes, Vol. 29, No. 16, 30.07.2015, p. 3460-3474.

Research output: Contribution to journalArticle

van der Velde, Y, Heidbüchel, I, Lyon, SW, Nyberg, L, Rodhe, A, Bishop, K & Troch, PA 2015, 'Consequences of mixing assumptions for time-variable travel time distributions', Hydrological Processes, vol. 29, no. 16, pp. 3460-3474. https://doi.org/10.1002/hyp.10372
van der Velde Y, Heidbüchel I, Lyon SW, Nyberg L, Rodhe A, Bishop K et al. Consequences of mixing assumptions for time-variable travel time distributions. Hydrological Processes. 2015 Jul 30;29(16):3460-3474. https://doi.org/10.1002/hyp.10372
van der Velde, Ype ; Heidbüchel, Ingo ; Lyon, Steve W. ; Nyberg, Lars ; Rodhe, Allan ; Bishop, Kevin ; Troch, Peter A. / Consequences of mixing assumptions for time-variable travel time distributions. In: Hydrological Processes. 2015 ; Vol. 29, No. 16. pp. 3460-3474.
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