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Trade-offs and the importance of separating science and values in environmental flow assessment

机译：权衡以及在环境流量评估中将科学与价值分开的重要性

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摘要

Hatfield and Paul (2015) note the potential for hidden value trade-offs in desktop models used for establishing environmental flows, which highlights the need to separate the contributions of science vs. values when developing flow regulations. This is best achieved with regulatory frameworks that clarify underlying values and objectives, identify any trade-offs that may be entertained between instream and out-of-stream uses, and provide clear guidance on the ecological and socio-economic contexts where different trade-offs and corresponding regulations may be implemented. Accurate flow-ecological response relationships are key to credible assessment of trade-offs or protection of instream values; when quantitative relationships are unavailable, model predictions and performance are highly sensitive to the assumed shape of the flow-ecology relationship. For example, by assuming that habitat capacity asymptotes at 20% of mean annual discharge, Hatfield and Paul (2015) implicitly discount the ecological value of higher base flows. Although cross-calibration of desktop models has value, performance of models for predicting environmental flows is best evaluated against independent measures of biological response to varying discharge (e.g. observed flow effects on fish biomass, production or other ecological attributes).
机译：Hatfield和Paul（2015）指出了用于建立环境流量的桌面模型中潜在的价值折衷的潜力，这突显了在制定流量规则时必须将科学与价值的贡献区分开来。这最好通过监管框架来实现，该框架要阐明基本的价值和目标，确定在上游和下游使用之间可能要进行的取舍，并就不同取舍的生态和社会经济环境提供明确的指导并可以执行相应的规定。准确的流-生态响应关系是可靠评估折衷或保护河流价值的关键；当没有定量关系时，模型的预测和性能对假定的流动生态关系形状高度敏感。例如，通过假设栖息地的容量渐近于年均排放量的20％，Hatfield和Paul（2015）隐含了较高基础流量的生态价值。尽管桌面模型的交叉校准具有价值，但是最好根据独立的生物量测量方法来评估预测环境流量的模型性能，以应对各种排放（例如，观察到的流量对鱼类生物量，产量或其他生态属性的影响）。

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  • 来源
    《Canadian Water Resources Journal》 |2017年第1期|88-96|共9页
  • 作者

    Rosenfeld Jordan S.; Ptolemy Ronald;

  • 作者单位

    Univ British Columbia, BC Minist Environm, Conservat Sci Sect, Vancouver, BC, Canada;

    BC Minist Environm, Conservat Sci Sect, Victoria, BC, Canada;

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