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首页> 外文期刊>Ecohydrology >Partitioning hydrologic contributions to an 'old-growth' riparian area in the Huron Mountains of Michigan, USA
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Partitioning hydrologic contributions to an 'old-growth' riparian area in the Huron Mountains of Michigan, USA

机译：在美国密歇根州休伦山的“老龄”河岸地区划分水文贡献

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摘要

Over the past century, annual snowfall has increased across the 'snow-belt' region of the Upper Peninsula of Michigan, yet total annual precipitation has not changed, with potential impacts on hydrological processes and ecosystem composition. Using an integrated hydrochemical approach, we characterized groundwater discharge and quantified the contribution of snow- and rain-derived waters to groundwater for an old-growth riparian area within the Huron Mountains in northern Michigan. We then quantified the relative contribution of lateral, hillslope-derived groundwater and upstream lake water to streamwater, and the extent of hyporheic zone expansion and contraction during one growing season. During a period of above-average snowfall, yet below average growing season precipitation, ～80% of the riparian area's groundwater reservoir was derived from snowmelt. The relative contribution of groundwater to streamflow ranged from 70% in June to 100% in August. The remainder was derived from upstream lakes and wetlands, which dropped in elevation and relative contribution from June to August. Finally, the extent of the hyporheic zone was small (<50 cm from streambed surface) and contracted towards the stream during the recession limb of the hydrograph. We conclude that if snowfall continues to rise while total annual precipitation declines, in line with climate change scenarios for the region, then water fluxes from snowmelt will increasingly dominate summer baseflow and could potentially increase spring flooding. However, because of overall declines in precipitation, streamflow patterns will likely change towards lower overall flow following the influence of the snowmelt period.
机译：在过去的一个世纪中，密歇根州上半岛“雪地带”地区的年度降雪量有所增加，但年度总降水量并未改变，对水文过程和生态系统组成可能产生影响。使用综合的水化学方法，我们对地下水排放进行了表征，并量化了雪和雨水对密歇根州北部休伦山脉内较老的河岸地区地下水的贡献。然后，我们量化了在一个生长季节中，来自山坡的地下水和上游湖泊水对河水的相对贡献，以及流变带扩展和收缩的程度。在降雪量高于平均水平，但低于生长季节平均降水量的时期，河岸地区约80％的地下水水库来自融雪。地下水对水流的相对贡献从6月的70％到8月的100％不等。其余部分来自上游湖泊和湿地，从6月到8月，它们的海拔和相对贡献下降。最后，流变带的范围很小（距河床表面<50 cm），并在水文测量仪的后退过程中向河道收缩。我们得出的结论是，如果根据该地区的气候变化情景，如果降雪继续增加，而年度总降水量减少，那么融雪的水通量将越来越多地主导夏季基流，并有可能增加春季洪水。但是，由于降水量总体下降，在融雪期的影响下，水流模式可能会朝着较低的总流量方向变化。

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  • 来源
    《Ecohydrology》 |2010年第3期|P.315-324|共10页
  • 作者

    Randall K. Kolka; Christian P. Giardina; Jason D. McClure; Alex Mayer; Martin F. Jurgensen;

  • 作者单位

    Forestry Sciences Laboratory, Northern Research Station, USDA Forest Service, Grand Rapids, MN 55744, USA USFS Forestry Sciences Laboratory, 1831 Hwy 169 E, Grand Rapids, MN 55744;

    Institute of Pacific Islands Forestry, Pacific Southwest Research Station, USDA Forest Service, 60 Nowelo Drive, Hilo, Hawaii 96720, USA;

    Michigan Technological University, Houghton, MI 49931, USA;

    Michigan Technological University, Houghton, MI 49931, USA;

    Michigan Technological University, Houghton, MI 49931, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    riparian; snowmelt; groundwater; hyporheic; stable isotopes;

    机译：河岸;融雪地下水;流泪稳定同位素;

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