The Frequency Component of Water Quality Criterion Compliance Assessment Should be Data Driven
The Frequency Component of Water Quality Criterion Compliance Assessment Should be Data Driven
复制标题
水质标准符合性评估的频率部分应由数据驱动
DOI：
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发表时间：
2015
影响因子：
3.5
通讯作者：
S. Qian
中科院分区：
文献类型：
--
作者：
S. Qian
美国的数字水质标准由三个部分组成，分别代表等级、持续时间和频率。虽然震级和持续时间定义得很好，在概念上也是明确的，但频率成分的含义往往是有争议的。在回顾了早期关于环境标准和准则的工作后，我们将频率分量解释为一种工具，用于解释在估计水质组分平均浓度时的不确定性。基于这种解读，我们举例说明了在合规评估中使用3年内一次超额的违约频率时的管理相关问题。我们提出了一种数据驱动的方法来估计适当的频率，以确保对水是否符合水质标准的一致置信度。数据驱动频率由水质、组分浓度、分布特征和样本量决定。通过两个实例说明了该方法的有效性。
A numerical water quality criterion in the U.S. consists of three components representing magnitude, duration, and frequency. While magnitude and duration are well defined and conceptually unambiguous, the meaning of the frequency component is often debatable. We interpret the frequency component as a tool for accounting for uncertainty in estimating the mean concentration of a water quality constituent, after revisiting early works on environmental standards and criteria. Based on this interpretation, we illustrate management-related issues when using the default frequency of one exceedance in 3 years in compliance assessment. We propose a data-driven approach for estimating an appropriate frequency to ensure a consistent level of confidence in a water’s compliance of a water quality criterion. The data-driven frequency is determined by water quality constituent concentration distribution characteristics and sample size. The method is illustrated using two examples.