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Dissolved oxygen and temperature dynamics in the Piako catchment

Report: TR 2014/50

Author: Paul Franklyn (NIWA)

About this report

The aim of this project was to empirically evaluate the interrelationships between flow and dissolved oxygen and water temperature dynamics in the Piako catchment. This was to be achieved throughthe following programme of work:

  • Characterisation of the temporal dynamics of dissolved oxygen and water temperature at a range of sites in the Piako catchment during summer low flow conditions. 
     
  • Analysis and interpretation of the results with respect to flow and the known tolerances of aquatic organisms.
During the course of the project, WRC carried out longitudinal surveys of dissolved oxygen concentrations in the lower reaches of the Piako River (Vant 2013). WRC subsequently requested that the results of those surveys be added to this report (Ed Brown, WRC, pers. com.).

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Dissolved oxygen and temperature dynamics in the Piako catchment [PDF, 2.7 MB]

Contents

  Executive summary 6
1 Introduction 8
1.1 Background 8
1.2 Project scope 8
2 Methodology 9
3 Results 12
3.1 Flow conditions during sampling 12
3.2 Water temperature dynamics 13
3.3 Dissolved oxygen dynamics 22
4 Discussion 42
4.1 Dissolved oxygen and flow 42
4.2 Lower Piako dissolved oxygen dynamics 43
5 Conclusions 45
6 Acknowledgements 45
7 References 46
Appendix A Proposed National Objectives Framework  48