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Historic changes of ecologically relevant hydrologic indices of unregulated Kansas streams.

机译：堪萨斯河不受管制的生态相关水文指数的历史变化。

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Over the past decades, it has been observed that the streamflow characteristics in the Great Plains rivers have substantially changed. These changes have affected and will continue to affect the management decisions within the watershed. This study was undertaken to document the changes for some unregulated streams in Kansas, characterize the streams in terms of some hydrologic indices, and identify the probable factors influencing the changes. Fourteen unregulated streams with 60 or more years of daily discharge data geographically distributed across the state were used. The analysis focused on hydrologic indices judged to be relevant to the lotic ecosystem. The state was divided into four regions, representing roughly the northwest, southwest, northeast and southeast sections of the state. Log Pearson III method was used for computing flow probabilities, Mann-Kendall test in conjunction with Sen's slope estimator was used for trend analysis, whereas the indicators of hydrologic alterations software was used to generate most hydrologic indices. Several factors believed to affect the streamflow were identified, and their influence was modeled over time. A multi-variate statistical model was run. Results show that there is substantial difference in the streamflow characteristics between the western and eastern regions. Many streamflow aspects have changed over time, and a number of them show significant and important change. Most streams in western Kansas have longer and more frequent dry periods. Potential recharge rate, land use, water use, soil and water conservation practices, and soil type were significant factors influencing the median to very low flow, but the effect varied among the regions. Results of this study could be useful to decision makers, water users, watershed stakeholders, and environmental conservation advocates in addressing problems and concerns related to stream and river management.
机译：在过去的几十年中，已经观察到大平原河流的水流特征已经发生了很大变化。这些变化已经并且将继续影响分水岭内的管理决策。进行这项研究的目的是记录堪萨斯州一些不受管制的河流的变化，用一些水文指数来表征河流，并确定影响这些变化的可能因素。使用了14条不受管制的流量，这些流量具有60年或60年以上的全州地理分布的日排放数据。该分析着重于与水生态系统相关的水文指数。该州分为四个区域，大致代表该州的西北，西南，东北和东南部分。 Log Pearson III方法用于计算流量概率，Mann-Kendall检验与Sen's斜率估计器一起用于趋势分析，而水文蚀变指标则用于生成大多数水文指数。确定了几个影响流量的因素，并对它们的影响进行了建模。运行了多元统计模型。结果表明，西部和东部地区的水流特征存在很大差异。随着时间的流逝，许多流方面都发生了变化，其中许多都显示出重大变化。堪萨斯州西部的大多数溪流的干旱期更长，更频繁。潜在补给率，土地利用，水利用，水土保持方式和土壤类型是影响中值至极低流量的重要因素，但不同地区的影响有所不同。这项研究的结果对于决策者，用水者，流域利益相关者和环境保护倡导者在解决与河流和河流管理有关的问题和关注方面可能是有用的。

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