Linking metrics of hydrological function and transit times to landscape controls in a heterogeneous mesoscale catchment

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Abstract

Long-term river flow data and one year of isotopic tracer data in a nested 749 km(2) catchment were analysed conjunctively to evaluate the relationships between hydrometric statistics, transit times, and catchment characteristics. The catchment comprised two distinct geomorphic provinces; upland headwaters draining glaciated landscapes underlain by crystalline geology and lowland headwaters draining a major regional sandstone aquifer. In the uplands, flow regimes were flashy with high runoff coefficients for storm hydrographs, steep recession curves and strong nonlinearity in event responses. In the lowlands, runoff coefficients were low, recessions less steep, and event responses more linear. Flow data from the catchment outfall showing damping of these extremes, but was most strongly influenced by the upland headwaters where precipitation was highest. The damping of variability in stable water isotopes between precipitation inputs and streamflow outputs reflected this; with upland tributaries least damped and lowland tributaries most damped. Attempts to quantify the mean transit times of the sampling points met with mixed success; partly reflecting the short run (1 year) of data, but mainly as a result of the marked damping in lowland sites. As a consequence, MTT estimates can only be said to be in the order of a few years in upland sites, but are probably decadal or greater in lowland tributaries. Again, the catchment outfall averages these extremes, but is more similar to the upland headwaters. Despite the difficulties in quantifying MTTs, it is clear that they, like the hydrological response, primarily reflect the dominant control of catchment soil cover, which in turn is determined by geology and glacial history. Copyright (C) 2011 John Wiley & Sons, Ltd.

Original languageEnglish
Pages (from-to)405-420
Number of pages16
JournalHydrological Processes
Volume26
Issue number3
Early online date11 May 2011
DOIs
Publication statusPublished - 30 Jan 2012

Fingerprint

catchment
headwater
damping
tributary
geology
runoff
glacial history
hydrological response
soil cover
hydrograph
river flow
nonlinearity
streamflow
tracer
sandstone
aquifer
isotope
sampling
water
draining

Keywords

  • tracers
  • stable isotopes
  • transit times
  • mesoscale
  • hydrogeology
  • event runoff coefficients
  • water residence times
  • base-flow
  • ungauged basins
  • process conceptualization
  • isotope hydrology
  • stable-isotopes
  • stream water
  • scale
  • separation

Cite this

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title = "Linking metrics of hydrological function and transit times to landscape controls in a heterogeneous mesoscale catchment",
abstract = "Long-term river flow data and one year of isotopic tracer data in a nested 749 km(2) catchment were analysed conjunctively to evaluate the relationships between hydrometric statistics, transit times, and catchment characteristics. The catchment comprised two distinct geomorphic provinces; upland headwaters draining glaciated landscapes underlain by crystalline geology and lowland headwaters draining a major regional sandstone aquifer. In the uplands, flow regimes were flashy with high runoff coefficients for storm hydrographs, steep recession curves and strong nonlinearity in event responses. In the lowlands, runoff coefficients were low, recessions less steep, and event responses more linear. Flow data from the catchment outfall showing damping of these extremes, but was most strongly influenced by the upland headwaters where precipitation was highest. The damping of variability in stable water isotopes between precipitation inputs and streamflow outputs reflected this; with upland tributaries least damped and lowland tributaries most damped. Attempts to quantify the mean transit times of the sampling points met with mixed success; partly reflecting the short run (1 year) of data, but mainly as a result of the marked damping in lowland sites. As a consequence, MTT estimates can only be said to be in the order of a few years in upland sites, but are probably decadal or greater in lowland tributaries. Again, the catchment outfall averages these extremes, but is more similar to the upland headwaters. Despite the difficulties in quantifying MTTs, it is clear that they, like the hydrological response, primarily reflect the dominant control of catchment soil cover, which in turn is determined by geology and glacial history. Copyright (C) 2011 John Wiley & Sons, Ltd.",
keywords = "tracers, stable isotopes, transit times, mesoscale, hydrogeology, event runoff coefficients, water residence times, base-flow, ungauged basins, process conceptualization, isotope hydrology, stable-isotopes , stream water, scale, separation",
author = "R. Capell and D. Tetzlaff and Hartley, {A. J.} and C. Soulsby",
year = "2012",
month = "1",
day = "30",
doi = "10.1002/hyp.8139",
language = "English",
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pages = "405--420",
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TY - JOUR

T1 - Linking metrics of hydrological function and transit times to landscape controls in a heterogeneous mesoscale catchment

AU - Capell, R.

AU - Tetzlaff, D.

AU - Hartley, A. J.

AU - Soulsby, C.

PY - 2012/1/30

Y1 - 2012/1/30

N2 - Long-term river flow data and one year of isotopic tracer data in a nested 749 km(2) catchment were analysed conjunctively to evaluate the relationships between hydrometric statistics, transit times, and catchment characteristics. The catchment comprised two distinct geomorphic provinces; upland headwaters draining glaciated landscapes underlain by crystalline geology and lowland headwaters draining a major regional sandstone aquifer. In the uplands, flow regimes were flashy with high runoff coefficients for storm hydrographs, steep recession curves and strong nonlinearity in event responses. In the lowlands, runoff coefficients were low, recessions less steep, and event responses more linear. Flow data from the catchment outfall showing damping of these extremes, but was most strongly influenced by the upland headwaters where precipitation was highest. The damping of variability in stable water isotopes between precipitation inputs and streamflow outputs reflected this; with upland tributaries least damped and lowland tributaries most damped. Attempts to quantify the mean transit times of the sampling points met with mixed success; partly reflecting the short run (1 year) of data, but mainly as a result of the marked damping in lowland sites. As a consequence, MTT estimates can only be said to be in the order of a few years in upland sites, but are probably decadal or greater in lowland tributaries. Again, the catchment outfall averages these extremes, but is more similar to the upland headwaters. Despite the difficulties in quantifying MTTs, it is clear that they, like the hydrological response, primarily reflect the dominant control of catchment soil cover, which in turn is determined by geology and glacial history. Copyright (C) 2011 John Wiley & Sons, Ltd.

AB - Long-term river flow data and one year of isotopic tracer data in a nested 749 km(2) catchment were analysed conjunctively to evaluate the relationships between hydrometric statistics, transit times, and catchment characteristics. The catchment comprised two distinct geomorphic provinces; upland headwaters draining glaciated landscapes underlain by crystalline geology and lowland headwaters draining a major regional sandstone aquifer. In the uplands, flow regimes were flashy with high runoff coefficients for storm hydrographs, steep recession curves and strong nonlinearity in event responses. In the lowlands, runoff coefficients were low, recessions less steep, and event responses more linear. Flow data from the catchment outfall showing damping of these extremes, but was most strongly influenced by the upland headwaters where precipitation was highest. The damping of variability in stable water isotopes between precipitation inputs and streamflow outputs reflected this; with upland tributaries least damped and lowland tributaries most damped. Attempts to quantify the mean transit times of the sampling points met with mixed success; partly reflecting the short run (1 year) of data, but mainly as a result of the marked damping in lowland sites. As a consequence, MTT estimates can only be said to be in the order of a few years in upland sites, but are probably decadal or greater in lowland tributaries. Again, the catchment outfall averages these extremes, but is more similar to the upland headwaters. Despite the difficulties in quantifying MTTs, it is clear that they, like the hydrological response, primarily reflect the dominant control of catchment soil cover, which in turn is determined by geology and glacial history. Copyright (C) 2011 John Wiley & Sons, Ltd.

KW - tracers

KW - stable isotopes

KW - transit times

KW - mesoscale

KW - hydrogeology

KW - event runoff coefficients

KW - water residence times

KW - base-flow

KW - ungauged basins

KW - process conceptualization

KW - isotope hydrology

KW - stable-isotopes

KW - stream water

KW - scale

KW - separation

U2 - 10.1002/hyp.8139

DO - 10.1002/hyp.8139

M3 - Article

VL - 26

SP - 405

EP - 420

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

IS - 3

ER -