Estimation of the environmental risk of regulated river flow

Kilisimasi Latu, Hector M. Malano, Justin F. Costelloe, Tim J. Peterson

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

A commonly accepted paradigm in environmental flow management is that a regulated river flow regime should mimic the natural hydrological regime to sustain the key attributes of freshwater ecosystems. Estimation of the environmental risk arising from flow regulation needs to consider all aspects of the flow regime when applied to water allocation decisions. We present a holistic, dynamic and robust approach that is based on a statistical analysis of the entire flow regime and accounts for flow stress indicators to produce an environmental risk time series based on the consequence of departures from the optimum flow range of a river or reach. When applied to a catchment, (Campaspe River, southern Australia) the model produced a dynamic and robust environmental risk time series that clearly showed that when the observed river flow is drawn away from the optimum range of environmental flow demand, the environmental risk increased. In addition, the model produced risk time series showing that the Campaspe River has reversed seasonal patterns of river flow due to water releases during summer periods, which altered the flow nature of the river. Hence, this resulted in higher environmental risk occurring during summer but lower in winter periods. Furthermore, we found that the vulnerability and coefficient of variation indices have the highest contributions to consequence in comparison to other indices used to calculate environmental risk.

Original languageEnglish
Pages (from-to)74-82
Number of pages9
JournalJournal of Hydrology
Volume517
DOIs
Publication statusPublished - 19 Sep 2014
Externally publishedYes

Keywords

  • Environmental flow demand
  • Environmental risk
  • Environmental risk model
  • Hydrological flow index
  • Risk time series

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