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Simulating Temperature in a Soil Incubation Experiment
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Published on: October 28, 2022

Towards setting environmental water temperature guidelines: a South African example.

Nicholas A Rivers-Moore1, Helen F Dallas, Craig Morris

  • 1Centre for Water Resources Research, University of KwaZulu-Natal, Private Bag X01, Scottsville, Pietermaritzburg 3209, South Africa. blackfly1@vodamail.co.za

Journal of Environmental Management
|June 25, 2013
PubMed
Summary

This study refines methods for assessing river thermal regimes, crucial for environmental flow assessments. Developing thermal guidelines helps protect aquatic species by understanding natural water temperature variability.

Keywords:
Biological thermal thresholdDaily rangeEnvironmental flowsGuidelinesThermal metrics

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Area of Science:

  • Environmental Science
  • Hydrology
  • Ecology

Background:

  • Water temperature significantly influences stream biodiversity.
  • Environmental flow assessments require robust metrics for thermal regimes.
  • Understanding natural thermal variability is key for aquatic ecosystem health.

Purpose of the Study:

  • To refine methods for setting environmental water temperature guidelines.
  • To integrate thermal regime analysis into environmental flow assessments.
  • To establish reference conditions for river thermal variability.

Main Methods:

  • Time series analysis of annual water temperature data from 82 sites in South Africa.
  • Development and application of 39 metrics (magnitude, frequency, duration, timing).
  • Classification of sites into thermal groups using multivariate analysis.

Main Results:

  • Sites were classified into distinct thermal groups based on regime similarity.
  • A thermal confidence envelope effectively evaluates deviations from natural variability.
  • The approach allows assessment of thermal time series against reference conditions.

Conclusions:

  • Deviation from natural variability is a suitable approach for evaluating thermal guidelines.
  • The presented method can be applied at various complexity levels.
  • Future research should link thermal patterns to biota and understand flow-temperature-biota interactions.