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首页> 外文期刊>Journal of the American Water Resources Association >STATIONARITY OF STREAMFLOW RECORDS AND THEIR INFLUENCE ON BANKFULL REGIONAL CURVES
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STATIONARITY OF STREAMFLOW RECORDS AND THEIR INFLUENCE ON BANKFULL REGIONAL CURVES

机译：流记录的平稳性及其对银行全区域曲线的影响

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Bankfull regional curves, which are curves that establish relationships among channel morphology, discharge, drainage area, are used extensively for stream restoration. These curves are developed upon the assumption that streamflows maintain stationarity over the entire record. We examined this assumption in the Driftless Area of southwestern Wisconsin where agricultural soil retention practices have changed, and precipitation has increased since the 1970s. We developed a bankfull regional curve for this area using field surveys of bankfull channel performed during 2008-2009 and annual series of peak streamflows for 10 rivers with stream-flow records ranging from the 1930s to 2009. We found bankfull flows to correlate to a 1.1 return period. To evaluate gage data statistics, we used the sign test to compare our channel morphology to historic 1.5 return period discharge (Qi.5) for five time periods: 1959-1972, 1973-1992, 1993-2008, 1999-2008, and the 1959-2008 period of record. Analysis of the historic gage data indicated that there has been a more than 30% decline in Q15 since 1959. Our research suggests that land conservation practices may have a larger impact on gaging station stationarity than annual precipitation changes do. Additionally, historic peak flow data from gages, which have records that span land conservation changes, may need to be truncated to represent current flow regimes.
机译：Bankfull区域曲线是建立河道形态，流量，排水面积之间关系的曲线，被广泛用于河流恢复。这些曲线是在假设流量在整个记录中保持平稳性的前提下开发的。我们在威斯康星州西南部的无漂移地区研究了这一假设，该地区自1970年代以来农业土壤保留方法发生了变化，降水量增加了。我们使用2008-2009年间对河床流量的实地调查以及1930年代至2009年流量记录的10条河流的年度峰值流量的年度调查，得出了该地区河床流量的区域曲线。我们发现河床流量与1.1相关。退货期。为了评估量具数据的统计数据，我们使用了符号测试，将我们的通道形态与历史上的1.5个返回期放电（Qi.5）进行了五个时间段的比较：1959-1972、1973-1992、1993-2008、1999-2008和1959-2008年记录。对历史测量数据的分析表明，自1959年以来，第15季度下降了30％以上。我们的研究表明，土地保护实践对测量站平稳性的影响可能大于年度降水量变化的影响。此外，来自测距仪的历史峰值流量数据可能需要截断以代表当前的流量状态，而峰值流量数据具有跨越土地保护变化的记录。

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