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首页> 外文期刊>Journal of the American Water Resources Association >CHANGES IN PATTERNS OF STREAMFLOW FROM UNREGULATED WATERSHEDS IN IDAHO, WESTERN WYOMING, AND NORTHERN NEVADA
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CHANGES IN PATTERNS OF STREAMFLOW FROM UNREGULATED WATERSHEDS IN IDAHO, WESTERN WYOMING, AND NORTHERN NEVADA

机译：爱达荷州，怀俄明州西部和内华达州北部不规则集水区的地表径流变化

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Recent studies have identified a pattern of earlier spring runoff across much of North America. Earlier spring runoff potentially poses numerous problems, including increased risk of flooding and reduced summer water supply for irrigation, power generation, and migratory fish passage. To identify changing runoff patterns in Idaho streams, streamflow records were analyzed for 26 U.S. Geological Survey gaging stations in Idaho, western Wyoming, and northern Nevada, each with a minimum of 41 years of record. The 26 stations are located on 23 unregulated and relatively pristine streams that drain areas ranging from 28 to >35,000 km~2. Four runoff parameters were trend tested at each station for both the period of historical record and from 1967 through 2007. Parameters tested were annual mean streamflow, annual minimum daily streamflow, and the dates of the 25th and 50th percentiles of the annual total streamflow. Results of a nonparametric Mann-Kendall trend test revealed a trend toward lower annual mean and annual minimum streamflows at a majority of the stations, as well as a trend toward earlier snowmelt runoff. Significant downward trends over the period of historical record were most prevalent for the annual minimum streamflow (12 stations) and the 50th percentile of streamflow (11 stations). At most stations, trends were more pronounced during the period from 1967 through 2007. A regional Kendall test for water years 1967 through 2007 revealed significant regional trends in the percent change in the annual mean and annual minimum streamflows (0.67% less per year and 0.62% less per year, respectively), the 25th percentile of streamflow (12.3 days earlier), and the 50th percentile of streamflow (11.5 days earlier).
机译：最近的研究已经确定了北美大部分地区春季降雨的模式。较早的春季径流可能会带来许多问题，包括洪水泛滥的风险增加，夏季灌溉，发电和generation游鱼类的供水减少。为了确定爱达荷州河流的径流模式变化，分析了爱达荷州，怀俄明州西部和内华达州北部的26个美国地质调查站的流量记录，每个记录至少有41年的记录。这26个站点位于23条不受管制且相对原始的小溪中，排水面积从28到> 35,000 km〜2不等。在历史记录期间和1967年至2007年期间，每个站都对四个径流参数进行了趋势测试。测试的参数是年平均流量，年最小日流量以及年总流量的第25和第50个百分数的日期。非参数Mann-Kendall趋势检验的结果表明，大多数站点的年平均流量和年最小流量减少，并且融雪径流更早。历史最低记录期间的显着下降趋势是年度最低流量（12站）和流量的第50个百分位数（11站）。在大多数站点，1967年至2007年期间的趋势更为明显。1967年至2007年水域的肯德尔地区检验表明，年平均流量和年最低流量的百分比变化具有显着的区域趋势（每年减少0.67％，每年减少0.62％）。每年分别减少％，25％的流量（提前12.3天）和50％的流量（提前11.5天）。

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