Resistance and resilience to droughts

hydropedological controls on catchment storage and run-off response

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Abstract

Hydropedological units are of critical importance in modulating catchment response in terms of storage and flux dynamics under changing hydrological conditions. We examined the short-term impacts of an extreme drought on the storage dynamics and runoff response in hydropedological units in a headwater catchment in the Scottish Highlands. These included poorly drained histosols in riparian zones and freely draining podzols on steeper hillslopes. To characterise the storage and runoff dynamics prior to, during, and after the drought period, precipitation, soil moisture, shallow ground water levels, and consequent runoff were monitored and stable water isotopes samples collected. Storage changes in the histosols were remarkably small (<40 mm), compared to those in moorland (~100 mm) and forest (~200mm) covered podzols. Although storage in all soils recovered soon after the drought, this took longest (3-4 months) for the forested podzols. During events, there was consistent threshold behaviour in most hydropedological units and the integrated response at the catchment scale, which was not affected by drying or wetting. The results suggest that during dry periods, large parts of the catchment were disconnected from the river network and runoff was generated mainly from the wet histosols. However, during events, there was an intermittent connection of the hillslopes that recharged the wetland and stream. This contributed to strong recovery and resilience of the catchment in its runoff response. Nevertheless, as future climate projections for northern environments suggest that prolonged dry periods are likely to become more frequent, further work is needed on the potential cumulative or carry over effects of consecutive drier periods.
Original languageEnglish
Pages (from-to)4579-4593
Number of pages15
JournalHydrological Processes
Volume29
Issue number21
Early online date1 Apr 2015
DOIs
Publication statusPublished - 15 Oct 2015

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Histosol
catchment
Podzol
runoff
drought
hillslope
moorland
riparian zone
wetting
headwater
water level
soil moisture
wetland
drought control
isotope
groundwater
climate
river
soil
water

Keywords

  • hydropedology
  • droughts
  • water storage
  • run-off response
  • isotopes

Cite this

@article{a80e19799a4142bf857c316f9db75479,
title = "Resistance and resilience to droughts: hydropedological controls on catchment storage and run-off response",
abstract = "Hydropedological units are of critical importance in modulating catchment response in terms of storage and flux dynamics under changing hydrological conditions. We examined the short-term impacts of an extreme drought on the storage dynamics and runoff response in hydropedological units in a headwater catchment in the Scottish Highlands. These included poorly drained histosols in riparian zones and freely draining podzols on steeper hillslopes. To characterise the storage and runoff dynamics prior to, during, and after the drought period, precipitation, soil moisture, shallow ground water levels, and consequent runoff were monitored and stable water isotopes samples collected. Storage changes in the histosols were remarkably small (<40 mm), compared to those in moorland (~100 mm) and forest (~200mm) covered podzols. Although storage in all soils recovered soon after the drought, this took longest (3-4 months) for the forested podzols. During events, there was consistent threshold behaviour in most hydropedological units and the integrated response at the catchment scale, which was not affected by drying or wetting. The results suggest that during dry periods, large parts of the catchment were disconnected from the river network and runoff was generated mainly from the wet histosols. However, during events, there was an intermittent connection of the hillslopes that recharged the wetland and stream. This contributed to strong recovery and resilience of the catchment in its runoff response. Nevertheless, as future climate projections for northern environments suggest that prolonged dry periods are likely to become more frequent, further work is needed on the potential cumulative or carry over effects of consecutive drier periods.",
keywords = "hydropedology, droughts, water storage, run-off response, isotopes",
author = "Josie Geris and Doerthe Tetzlaff and Chris Soulsby",
note = "Acknowledgements The authors would like to thank Jonathan Dick, Maria Blumstock, Claire Tunaley and Jason Lessels for assistance with the field work and Audrey Innes for lab sample preparation. Climatic data were provided by Iain Malcolm and Marine Scotland Fisheries at the Freshwater Lab, Pitlochry. Additional precipitation and temperature data were provided by the UK Meteorological Office and the British Atmospheric Data Centre (BADC). We are grateful for the careful and constructive comments of two anonymous reviewers that helped to improve an earlier version of this manuscript. The European Research Council ERC (project GA 335910) is thanked for funding.",
year = "2015",
month = "10",
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language = "English",
volume = "29",
pages = "4579--4593",
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issn = "0885-6087",
publisher = "Wiley-Blackwell",
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TY - JOUR

T1 - Resistance and resilience to droughts

T2 - hydropedological controls on catchment storage and run-off response

AU - Geris, Josie

AU - Tetzlaff, Doerthe

AU - Soulsby, Chris

N1 - Acknowledgements The authors would like to thank Jonathan Dick, Maria Blumstock, Claire Tunaley and Jason Lessels for assistance with the field work and Audrey Innes for lab sample preparation. Climatic data were provided by Iain Malcolm and Marine Scotland Fisheries at the Freshwater Lab, Pitlochry. Additional precipitation and temperature data were provided by the UK Meteorological Office and the British Atmospheric Data Centre (BADC). We are grateful for the careful and constructive comments of two anonymous reviewers that helped to improve an earlier version of this manuscript. The European Research Council ERC (project GA 335910) is thanked for funding.

PY - 2015/10/15

Y1 - 2015/10/15

N2 - Hydropedological units are of critical importance in modulating catchment response in terms of storage and flux dynamics under changing hydrological conditions. We examined the short-term impacts of an extreme drought on the storage dynamics and runoff response in hydropedological units in a headwater catchment in the Scottish Highlands. These included poorly drained histosols in riparian zones and freely draining podzols on steeper hillslopes. To characterise the storage and runoff dynamics prior to, during, and after the drought period, precipitation, soil moisture, shallow ground water levels, and consequent runoff were monitored and stable water isotopes samples collected. Storage changes in the histosols were remarkably small (<40 mm), compared to those in moorland (~100 mm) and forest (~200mm) covered podzols. Although storage in all soils recovered soon after the drought, this took longest (3-4 months) for the forested podzols. During events, there was consistent threshold behaviour in most hydropedological units and the integrated response at the catchment scale, which was not affected by drying or wetting. The results suggest that during dry periods, large parts of the catchment were disconnected from the river network and runoff was generated mainly from the wet histosols. However, during events, there was an intermittent connection of the hillslopes that recharged the wetland and stream. This contributed to strong recovery and resilience of the catchment in its runoff response. Nevertheless, as future climate projections for northern environments suggest that prolonged dry periods are likely to become more frequent, further work is needed on the potential cumulative or carry over effects of consecutive drier periods.

AB - Hydropedological units are of critical importance in modulating catchment response in terms of storage and flux dynamics under changing hydrological conditions. We examined the short-term impacts of an extreme drought on the storage dynamics and runoff response in hydropedological units in a headwater catchment in the Scottish Highlands. These included poorly drained histosols in riparian zones and freely draining podzols on steeper hillslopes. To characterise the storage and runoff dynamics prior to, during, and after the drought period, precipitation, soil moisture, shallow ground water levels, and consequent runoff were monitored and stable water isotopes samples collected. Storage changes in the histosols were remarkably small (<40 mm), compared to those in moorland (~100 mm) and forest (~200mm) covered podzols. Although storage in all soils recovered soon after the drought, this took longest (3-4 months) for the forested podzols. During events, there was consistent threshold behaviour in most hydropedological units and the integrated response at the catchment scale, which was not affected by drying or wetting. The results suggest that during dry periods, large parts of the catchment were disconnected from the river network and runoff was generated mainly from the wet histosols. However, during events, there was an intermittent connection of the hillslopes that recharged the wetland and stream. This contributed to strong recovery and resilience of the catchment in its runoff response. Nevertheless, as future climate projections for northern environments suggest that prolonged dry periods are likely to become more frequent, further work is needed on the potential cumulative or carry over effects of consecutive drier periods.

KW - hydropedology

KW - droughts

KW - water storage

KW - run-off response

KW - isotopes

U2 - 10.1002/hyp.10480

DO - 10.1002/hyp.10480

M3 - Article

VL - 29

SP - 4579

EP - 4593

JO - Hydrological Processes

JF - Hydrological Processes

SN - 0885-6087

IS - 21

ER -