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Sampling frequency for semi-arid streams and rivers: Implications for national parks in the Sonoran Desert Network.

机译:半干旱河流和河流的采样频率:对Sonoran沙漠网络中国家公园的影响。

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摘要

In developing a water quality monitoring program, the sampling frequency chosen should be able to reliably detect changes in water quality trends. Three datasets are evaluated for Minimal Detectable Change in surface water quality to examine the loss of trend detectability as sampling frequency decreases for sites within the National Park Service's Sonoran Desert Network by re-sampling the records as quarterly and annual datasets and by superimposing step and linear trends over the natural data to estimate the time it takes the Seasonal Kendall Test to detect trends of a specific threshold. Wilcoxon Rank Sum analyses found that monthly and quarterly sampling consistently draw from the same distribution of trend detection times however, annual sampling can take significantly longer. Therefore, even with a loss in power from reduced sampling, quarterly sampling of Park waters adequately detects trends (70%) compared to monthly whereas annual sampling is insufficient in trend detection (30%).
机译:在制定水质监测程序时,选择的采样频率应能够可靠地检测水质趋势的变化。对三个数据集进行了地表水水质最小可检测变化评估,以通过对记录进行季度和年度数据集重新采样并叠加阶跃和线性来检验国家公园管理局Sonoran沙漠网络内各站点采样频率降低时趋势可检测性的损失。根据自然数据的趋势来估计季节性Kendall检验检测特定阈值趋势所花费的时间。 Wilcoxon Rank Sum分析发现,月度和季度抽样始终取自趋势检测时间的相同分布,但是,年度抽样可能会花费更长的时间。因此,即使采样减少会导致功率损失,与月度采样相比,公园水的季度采样也足以检测趋势(70%),而年度采样不足以检测趋势(30%)。

著录项

  • 作者

    Lindsey, Melanie M.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Hydrology.
  • 学位 M.S.
  • 年度 2010
  • 页码 88 p.
  • 总页数 88
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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