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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Using Ecologically Relevant Hydrologic Indices to Examine Temporal Changes in Unregulated Streams inKansas
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Using Ecologically Relevant Hydrologic Indices to Examine Temporal Changes in Unregulated Streams inKansas

机译：使用生态相关的水文指标来检查堪萨斯州的不受管制流中的时间变化

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Irrigation water demand in the Great Plains region is lowering groundwater levels, reducing base flow and dewatering vulnerable streams. In western Kansas, groundwater has ceased to supply dependable baseflow to previously perennial streams. The change in baseflow has altered both the natural flow regime of streams and the level of in stream connectivity among pools at low flow. Previous studies have shown that changes occurring in streams have adverse impacts on freshwater ecosystem and fish speciesdistribution. The objective of this study was to document stream flow regime changes for unregulated streams in four geographically distinct regions across Kansas using 60 or more years of daily discharge data. The analysis focused on spatial differences and temporal changes in hydrologic indices relevant to the lotic ecosystem for fourteen unregulated streams. Log Pearson III method was used for computing flow probabilities. The Mann-Kendall test in conjunction with Sen's slope estimator was used fortrend analysis. Indicators of Hydrologic Alterations software was used to generate hydrologic indices. Results show a substantial difference in streamflow characteristics between western and eastern regions. Temporally variable indices include median, zero and 1 cfs flow, and timing of low flow. Most streams in western Kansas now have longer and more frequent dry periods. Moreover, the timing of these dry periods could adversely impact essential ecological services and functions. Results of this study are intended to guide decision makers, watershed stakeholders, and environmental conservation advocates in addressing problems and concerns related to stream and river management.
机译：大平原区域的灌溉用水需求降低地下水位，减少碱流量和脱水脆弱的溪流。在西部堪萨斯州，地下水已停止向以前的常年流供应可靠的碱流。 Baseflow的变化改变了池之间的流的自然流动制度和低流量之间的流连接的水平。以前的研究表明，流中发生的变化对淡水生态系统和鱼类分布产生不利影响。本研究的目的是在堪萨斯州的四个地理上不同地区的四个地理上不同区域中的未调节流的内容进行记录流程，使用60多年的日常放电数据。分析专注于有关十四个不受管制的大型汽油生态系统的水文指数中的空间差异和时间变化。 Log Pearson III方法用于计算流量概率。使用与SEN的斜率估计器结合的MANN-KENDALL测试争斗分析。水文改变软件的指标用于产生水文指数。结果表明西部和东部地区之间的流流特征差异很大。时间变量指数包括中值，零和1 CFS流，以及低流量的时间。西方堪萨斯州的大多数溪流现在具有更长且更频繁的干燥时期。此外，这些干燥期的时间可能会对基本的生态服务和功能产生不利影响。本研究的结果旨在指导决策者，流域利益攸关方和环境保护倡导者解决与流和河流管理有关的问题和疑虑。

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