Using lumped conceptual rainfall-runoff models to simulate daily isotope variability with fractionation in a nested mesoscale catchment

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Abstract

This paper presents 19 months of stable isotope (delta H-2 and delta O-18) data to enhance understanding of water and solute transport at two spatial scales (2.3 km(2) and 122 km(2)) in the agricultural Lunan catchment, Scotland. Daily precipitation and stream isotope data, weekly lake and spring isotope data and monthly groundwater isotope data revealed important insights into flow pathways and mixing of water at both scales. In particular, a deeper groundwater flow path significantly contributes to total streamflow (25-50%). Upstream lake isotope dynamics, susceptible to evaporative fractionation, also appeared to have an important influence on the downstream isotope composition. This unique tracer data set facilitated the conceptualization of a lumped catchment-scale flow-tracer model. The incorporation of hydrological, mixing and fractionation processes based on these data improved simulations of the stream delta H-2 isotope response at the catchment outlet from 0.37 to 0.56 for the Nash-Sutcliffe statistic. The stable isotope data successfully aided model conceptualization and calibration in the quest for a simple water and solute transport model with improved representation of process dynamics. (C) 2010 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)383-394
Number of pages12
JournalAdvances in Water Resources
Volume34
Issue number3
Early online date17 Dec 2010
DOIs
Publication statusPublished - Mar 2011

Keywords

  • stable isotopes
  • conceptual models
  • fractionation
  • spatial scale
  • hydrological processes
  • storm runoff
  • transit-time
  • water
  • uncertainty
  • transport
  • future
  • deuterium
  • tracers
  • precipitation
  • groundwater

Cite this

@article{164c7f83d3294d62836bbbef0fd00af1,
title = "Using lumped conceptual rainfall-runoff models to simulate daily isotope variability with fractionation in a nested mesoscale catchment",
abstract = "This paper presents 19 months of stable isotope (delta H-2 and delta O-18) data to enhance understanding of water and solute transport at two spatial scales (2.3 km(2) and 122 km(2)) in the agricultural Lunan catchment, Scotland. Daily precipitation and stream isotope data, weekly lake and spring isotope data and monthly groundwater isotope data revealed important insights into flow pathways and mixing of water at both scales. In particular, a deeper groundwater flow path significantly contributes to total streamflow (25-50{\%}). Upstream lake isotope dynamics, susceptible to evaporative fractionation, also appeared to have an important influence on the downstream isotope composition. This unique tracer data set facilitated the conceptualization of a lumped catchment-scale flow-tracer model. The incorporation of hydrological, mixing and fractionation processes based on these data improved simulations of the stream delta H-2 isotope response at the catchment outlet from 0.37 to 0.56 for the Nash-Sutcliffe statistic. The stable isotope data successfully aided model conceptualization and calibration in the quest for a simple water and solute transport model with improved representation of process dynamics. (C) 2010 Elsevier Ltd. All rights reserved.",
keywords = "stable isotopes, conceptual models, fractionation, spatial scale, hydrological processes, storm runoff, transit-time, water, uncertainty, transport, future, deuterium, tracers, precipitation, groundwater",
author = "Christian Birkel and Doerthe Tetzlaff and Dunn, {Sarah M.} and Christopher Soulsby",
year = "2011",
month = "3",
doi = "10.1016/j.advwatres.2010.12.006",
language = "English",
volume = "34",
pages = "383--394",
journal = "Advances in Water Resources",
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TY - JOUR

T1 - Using lumped conceptual rainfall-runoff models to simulate daily isotope variability with fractionation in a nested mesoscale catchment

AU - Birkel, Christian

AU - Tetzlaff, Doerthe

AU - Dunn, Sarah M.

AU - Soulsby, Christopher

PY - 2011/3

Y1 - 2011/3

N2 - This paper presents 19 months of stable isotope (delta H-2 and delta O-18) data to enhance understanding of water and solute transport at two spatial scales (2.3 km(2) and 122 km(2)) in the agricultural Lunan catchment, Scotland. Daily precipitation and stream isotope data, weekly lake and spring isotope data and monthly groundwater isotope data revealed important insights into flow pathways and mixing of water at both scales. In particular, a deeper groundwater flow path significantly contributes to total streamflow (25-50%). Upstream lake isotope dynamics, susceptible to evaporative fractionation, also appeared to have an important influence on the downstream isotope composition. This unique tracer data set facilitated the conceptualization of a lumped catchment-scale flow-tracer model. The incorporation of hydrological, mixing and fractionation processes based on these data improved simulations of the stream delta H-2 isotope response at the catchment outlet from 0.37 to 0.56 for the Nash-Sutcliffe statistic. The stable isotope data successfully aided model conceptualization and calibration in the quest for a simple water and solute transport model with improved representation of process dynamics. (C) 2010 Elsevier Ltd. All rights reserved.

AB - This paper presents 19 months of stable isotope (delta H-2 and delta O-18) data to enhance understanding of water and solute transport at two spatial scales (2.3 km(2) and 122 km(2)) in the agricultural Lunan catchment, Scotland. Daily precipitation and stream isotope data, weekly lake and spring isotope data and monthly groundwater isotope data revealed important insights into flow pathways and mixing of water at both scales. In particular, a deeper groundwater flow path significantly contributes to total streamflow (25-50%). Upstream lake isotope dynamics, susceptible to evaporative fractionation, also appeared to have an important influence on the downstream isotope composition. This unique tracer data set facilitated the conceptualization of a lumped catchment-scale flow-tracer model. The incorporation of hydrological, mixing and fractionation processes based on these data improved simulations of the stream delta H-2 isotope response at the catchment outlet from 0.37 to 0.56 for the Nash-Sutcliffe statistic. The stable isotope data successfully aided model conceptualization and calibration in the quest for a simple water and solute transport model with improved representation of process dynamics. (C) 2010 Elsevier Ltd. All rights reserved.

KW - stable isotopes

KW - conceptual models

KW - fractionation

KW - spatial scale

KW - hydrological processes

KW - storm runoff

KW - transit-time

KW - water

KW - uncertainty

KW - transport

KW - future

KW - deuterium

KW - tracers

KW - precipitation

KW - groundwater

U2 - 10.1016/j.advwatres.2010.12.006

DO - 10.1016/j.advwatres.2010.12.006

M3 - Article

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SP - 383

EP - 394

JO - Advances in Water Resources

JF - Advances in Water Resources

SN - 0309-1708

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ER -