Using high resolution isotope data and alternative calibration strategies for a tracer-aided runoff model in a nested catchment

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Abstract

Testing hydrological models over different spatio-temporal scales is important both for evaluating diagnostics and aiding process understanding. High-frequency (6hr) stable isotope sampling of rainfall and runoff was undertaken during 3 week periods in summer and winter within 12 months of daily sampling in a 3.2 km2 catchment in the Scottish Highlands. This was used to calibrate and test a tracer-aided model to assess the: (1) information content of high resolution data; (2) effect of different calibration strategies on simulations and inferred processes; (3) model transferability to <1 km2 sub-catchment. The 6-hourly data were successfully incorporated without loss of model performance, improving the temporal resolution of the modelling, and making it more relevant to the time dynamics of the isotope and hydrometric response. However, this added little new information due to old-water dominance and riparian mixing in this peatland catchment. Time variant results, from differential split sample testing, highlighted the importance of calibrating to a wide range of hydrological conditions. This also provided insights into the non-stationarity of catchment mixing processes, in relation to storage and water ages, which varied markedly depending on the calibration period. Application to the nested sub-catchment produced equivalent parameterisation and performance, highlighting similarity in dominant processes. The study highlighted the utility of high-resolution data in combination with tracer-aided models, applied at multiple spatial scales, as learning tools to enhance process understanding and evaluation of model behaviour across nonstationary conditions. This helps reveal more fully the catchment response in terms of the different mechanistic controls on both wave celerites and particle velocities.
Original languageEnglish
Pages (from-to)3962-3978
Number of pages17
JournalHydrological Processes
Volume31
Issue number22
Early online date15 Sep 2017
DOIs
Publication statusPublished - 30 Oct 2017

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tracer
isotope
catchment
runoff
calibration
sampling
peatland
parameterization
stable isotope
learning
water
rainfall
winter
summer
modeling
simulation

Keywords

  • high resolution isotopes
  • tracer-aided modelling
  • parameter transferability
  • catchment storage
  • water age
  • runoff processes

Cite this

@article{ad24f7ee95b448acb95a126030362970,
title = "Using high resolution isotope data and alternative calibration strategies for a tracer-aided runoff model in a nested catchment",
abstract = "Testing hydrological models over different spatio-temporal scales is important both for evaluating diagnostics and aiding process understanding. High-frequency (6hr) stable isotope sampling of rainfall and runoff was undertaken during 3 week periods in summer and winter within 12 months of daily sampling in a 3.2 km2 catchment in the Scottish Highlands. This was used to calibrate and test a tracer-aided model to assess the: (1) information content of high resolution data; (2) effect of different calibration strategies on simulations and inferred processes; (3) model transferability to <1 km2 sub-catchment. The 6-hourly data were successfully incorporated without loss of model performance, improving the temporal resolution of the modelling, and making it more relevant to the time dynamics of the isotope and hydrometric response. However, this added little new information due to old-water dominance and riparian mixing in this peatland catchment. Time variant results, from differential split sample testing, highlighted the importance of calibrating to a wide range of hydrological conditions. This also provided insights into the non-stationarity of catchment mixing processes, in relation to storage and water ages, which varied markedly depending on the calibration period. Application to the nested sub-catchment produced equivalent parameterisation and performance, highlighting similarity in dominant processes. The study highlighted the utility of high-resolution data in combination with tracer-aided models, applied at multiple spatial scales, as learning tools to enhance process understanding and evaluation of model behaviour across nonstationary conditions. This helps reveal more fully the catchment response in terms of the different mechanistic controls on both wave celerites and particle velocities.",
keywords = "high resolution isotopes, tracer-aided modelling, parameter transferability, catchment storage, water age, runoff processes",
author = "Claire Tunaley and Doerthe Tetzlaff and Christian Birkel and Chris Soulsby",
note = "Acknowledgements The authors would like to thank Jonathan Dick and Audrey Innes for lab analysis and preparation of the isotope samples. In addition, we would like to thank Iain Malcolm (Marine Scotland Science) for providing AWS data. Finally, we gratefully acknowledge the European Research Council ERC (project GA 335910 VeWa) for funding the VeWa project. The data used are available from the authors. CB acknowledges support from the University of Costa Rica (project 217-B4-239 and the Isotope Network for Tropical Ecosystem Studies (ISONet)).",
year = "2017",
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doi = "10.1002/hyp.11313",
language = "English",
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publisher = "Wiley-Blackwell",
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T1 - Using high resolution isotope data and alternative calibration strategies for a tracer-aided runoff model in a nested catchment

AU - Tunaley, Claire

AU - Tetzlaff, Doerthe

AU - Birkel, Christian

AU - Soulsby, Chris

N1 - Acknowledgements The authors would like to thank Jonathan Dick and Audrey Innes for lab analysis and preparation of the isotope samples. In addition, we would like to thank Iain Malcolm (Marine Scotland Science) for providing AWS data. Finally, we gratefully acknowledge the European Research Council ERC (project GA 335910 VeWa) for funding the VeWa project. The data used are available from the authors. CB acknowledges support from the University of Costa Rica (project 217-B4-239 and the Isotope Network for Tropical Ecosystem Studies (ISONet)).

PY - 2017/10/30

Y1 - 2017/10/30

N2 - Testing hydrological models over different spatio-temporal scales is important both for evaluating diagnostics and aiding process understanding. High-frequency (6hr) stable isotope sampling of rainfall and runoff was undertaken during 3 week periods in summer and winter within 12 months of daily sampling in a 3.2 km2 catchment in the Scottish Highlands. This was used to calibrate and test a tracer-aided model to assess the: (1) information content of high resolution data; (2) effect of different calibration strategies on simulations and inferred processes; (3) model transferability to <1 km2 sub-catchment. The 6-hourly data were successfully incorporated without loss of model performance, improving the temporal resolution of the modelling, and making it more relevant to the time dynamics of the isotope and hydrometric response. However, this added little new information due to old-water dominance and riparian mixing in this peatland catchment. Time variant results, from differential split sample testing, highlighted the importance of calibrating to a wide range of hydrological conditions. This also provided insights into the non-stationarity of catchment mixing processes, in relation to storage and water ages, which varied markedly depending on the calibration period. Application to the nested sub-catchment produced equivalent parameterisation and performance, highlighting similarity in dominant processes. The study highlighted the utility of high-resolution data in combination with tracer-aided models, applied at multiple spatial scales, as learning tools to enhance process understanding and evaluation of model behaviour across nonstationary conditions. This helps reveal more fully the catchment response in terms of the different mechanistic controls on both wave celerites and particle velocities.

AB - Testing hydrological models over different spatio-temporal scales is important both for evaluating diagnostics and aiding process understanding. High-frequency (6hr) stable isotope sampling of rainfall and runoff was undertaken during 3 week periods in summer and winter within 12 months of daily sampling in a 3.2 km2 catchment in the Scottish Highlands. This was used to calibrate and test a tracer-aided model to assess the: (1) information content of high resolution data; (2) effect of different calibration strategies on simulations and inferred processes; (3) model transferability to <1 km2 sub-catchment. The 6-hourly data were successfully incorporated without loss of model performance, improving the temporal resolution of the modelling, and making it more relevant to the time dynamics of the isotope and hydrometric response. However, this added little new information due to old-water dominance and riparian mixing in this peatland catchment. Time variant results, from differential split sample testing, highlighted the importance of calibrating to a wide range of hydrological conditions. This also provided insights into the non-stationarity of catchment mixing processes, in relation to storage and water ages, which varied markedly depending on the calibration period. Application to the nested sub-catchment produced equivalent parameterisation and performance, highlighting similarity in dominant processes. The study highlighted the utility of high-resolution data in combination with tracer-aided models, applied at multiple spatial scales, as learning tools to enhance process understanding and evaluation of model behaviour across nonstationary conditions. This helps reveal more fully the catchment response in terms of the different mechanistic controls on both wave celerites and particle velocities.

KW - high resolution isotopes

KW - tracer-aided modelling

KW - parameter transferability

KW - catchment storage

KW - water age

KW - runoff processes

U2 - 10.1002/hyp.11313

DO - 10.1002/hyp.11313

M3 - Article

VL - 31

SP - 3962

EP - 3978

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

IS - 22

ER -