Using time domain and geographic source tracers to conceptualize streamflow generation processes in lumped rainfall-runoff models

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Abstract

The temporal dynamics and geographical sources of streamflow were conceptualized in a lumped rainfall-runoff model (isoSAM(dyn)) using isotopic and geochemical tracers derived from a field study in a 3.6 km(2) upland catchment in Scotland. High-resolution (daily) sampling of stable isotopes in precipitation and streamflow over a hydrological year, supplemented by fortnightly sampling of groundwater and riparian saturation zones, allowed hypotheses of runoff generation processes to be tested. These were conceptualized in a previously developed model (SAM(dyn)) based only on geochemically defined geographic source tracers, which showed that the nonlinear dynamic expansion and contraction of riparian saturation areas is the dominant mechanism for storm runoff generation in the catchment. While SAM(dyn) resulted in reasonable simulation of streamflows and alkalinity (as a source tracer), it was unable to reproduce the rainfall-runoff dynamics of deuterium (delta H-2). Using the model in a learning framework, incorporation of parameters for passive storage in catchment hillslopes and groundwater mixing in riparian saturation zones, along with associated isotopic fractionation, improved delta H-2 simulations in stream water and the major catchment water stores. The resulting model provided a conceptualization of rainfall-runoff processes that broadly reconciled hydrometric data and geochemical and isotopic signals. However, in this particular catchment, fractionation of water in surface saturation zones appears to be a complex process that prevents the simulation of short-term isotope dynamics in the stream during the summer period.

Original languageEnglish
Article numberw02515
Number of pages15
JournalWater Resources Research
Volume47
Issue number2
Early online date11 Feb 2011
DOIs
Publication statusPublished - Feb 2011

Keywords

  • hydrograph separation
  • mesoscale catchment
  • surface-water
  • transit times
  • hydrology
  • groundwater
  • calibration
  • deuterium
  • precipitation
  • transport

Cite this

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title = "Using time domain and geographic source tracers to conceptualize streamflow generation processes in lumped rainfall-runoff models",
abstract = "The temporal dynamics and geographical sources of streamflow were conceptualized in a lumped rainfall-runoff model (isoSAM(dyn)) using isotopic and geochemical tracers derived from a field study in a 3.6 km(2) upland catchment in Scotland. High-resolution (daily) sampling of stable isotopes in precipitation and streamflow over a hydrological year, supplemented by fortnightly sampling of groundwater and riparian saturation zones, allowed hypotheses of runoff generation processes to be tested. These were conceptualized in a previously developed model (SAM(dyn)) based only on geochemically defined geographic source tracers, which showed that the nonlinear dynamic expansion and contraction of riparian saturation areas is the dominant mechanism for storm runoff generation in the catchment. While SAM(dyn) resulted in reasonable simulation of streamflows and alkalinity (as a source tracer), it was unable to reproduce the rainfall-runoff dynamics of deuterium (delta H-2). Using the model in a learning framework, incorporation of parameters for passive storage in catchment hillslopes and groundwater mixing in riparian saturation zones, along with associated isotopic fractionation, improved delta H-2 simulations in stream water and the major catchment water stores. The resulting model provided a conceptualization of rainfall-runoff processes that broadly reconciled hydrometric data and geochemical and isotopic signals. However, in this particular catchment, fractionation of water in surface saturation zones appears to be a complex process that prevents the simulation of short-term isotope dynamics in the stream during the summer period.",
keywords = "hydrograph separation, mesoscale catchment, surface-water, transit times, hydrology, groundwater, calibration, deuterium, precipitation, transport",
author = "Christian Birkel and Doerthe Tetzlaff and Dunn, {Sarah M.} and Chris Soulsby",
year = "2011",
month = "2",
doi = "10.1029/2010WR009547",
language = "English",
volume = "47",
journal = "Water Resources Research",
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T1 - Using time domain and geographic source tracers to conceptualize streamflow generation processes in lumped rainfall-runoff models

AU - Birkel, Christian

AU - Tetzlaff, Doerthe

AU - Dunn, Sarah M.

AU - Soulsby, Chris

PY - 2011/2

Y1 - 2011/2

N2 - The temporal dynamics and geographical sources of streamflow were conceptualized in a lumped rainfall-runoff model (isoSAM(dyn)) using isotopic and geochemical tracers derived from a field study in a 3.6 km(2) upland catchment in Scotland. High-resolution (daily) sampling of stable isotopes in precipitation and streamflow over a hydrological year, supplemented by fortnightly sampling of groundwater and riparian saturation zones, allowed hypotheses of runoff generation processes to be tested. These were conceptualized in a previously developed model (SAM(dyn)) based only on geochemically defined geographic source tracers, which showed that the nonlinear dynamic expansion and contraction of riparian saturation areas is the dominant mechanism for storm runoff generation in the catchment. While SAM(dyn) resulted in reasonable simulation of streamflows and alkalinity (as a source tracer), it was unable to reproduce the rainfall-runoff dynamics of deuterium (delta H-2). Using the model in a learning framework, incorporation of parameters for passive storage in catchment hillslopes and groundwater mixing in riparian saturation zones, along with associated isotopic fractionation, improved delta H-2 simulations in stream water and the major catchment water stores. The resulting model provided a conceptualization of rainfall-runoff processes that broadly reconciled hydrometric data and geochemical and isotopic signals. However, in this particular catchment, fractionation of water in surface saturation zones appears to be a complex process that prevents the simulation of short-term isotope dynamics in the stream during the summer period.

AB - The temporal dynamics and geographical sources of streamflow were conceptualized in a lumped rainfall-runoff model (isoSAM(dyn)) using isotopic and geochemical tracers derived from a field study in a 3.6 km(2) upland catchment in Scotland. High-resolution (daily) sampling of stable isotopes in precipitation and streamflow over a hydrological year, supplemented by fortnightly sampling of groundwater and riparian saturation zones, allowed hypotheses of runoff generation processes to be tested. These were conceptualized in a previously developed model (SAM(dyn)) based only on geochemically defined geographic source tracers, which showed that the nonlinear dynamic expansion and contraction of riparian saturation areas is the dominant mechanism for storm runoff generation in the catchment. While SAM(dyn) resulted in reasonable simulation of streamflows and alkalinity (as a source tracer), it was unable to reproduce the rainfall-runoff dynamics of deuterium (delta H-2). Using the model in a learning framework, incorporation of parameters for passive storage in catchment hillslopes and groundwater mixing in riparian saturation zones, along with associated isotopic fractionation, improved delta H-2 simulations in stream water and the major catchment water stores. The resulting model provided a conceptualization of rainfall-runoff processes that broadly reconciled hydrometric data and geochemical and isotopic signals. However, in this particular catchment, fractionation of water in surface saturation zones appears to be a complex process that prevents the simulation of short-term isotope dynamics in the stream during the summer period.

KW - hydrograph separation

KW - mesoscale catchment

KW - surface-water

KW - transit times

KW - hydrology

KW - groundwater

KW - calibration

KW - deuterium

KW - precipitation

KW - transport

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DO - 10.1029/2010WR009547

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VL - 47

JO - Water Resources Research

JF - Water Resources Research

SN - 0043-1397

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