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首页> 外文期刊>Canadian Water Resources Journal >Spatiotemporal patterns of baseflow metrics for basins draining the Oak Ridges Moraine, southern Ontario, Canada
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Spatiotemporal patterns of baseflow metrics for basins draining the Oak Ridges Moraine, southern Ontario, Canada

机译：加拿大安大略省南部Oak Oaks Ridges冰a排水盆地的基本流量指标的时空分布

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摘要

The Oak Ridges Moraine (ORM) is a key hydrogeologic feature in southern Ontario, supplying potable water along with important aquatic ecosystem services. Stream baseflow is a useful indicator of groundwater discharge to streams on the ORM and gives insight into the regional hydrogeologic system. This study examines how climatic and basin attributes explain spatiotemporal patterns in baseflow metrics for streams draining the ORM. Baseflow was separated from streamflow using an automated digital filter, and water-year baseflow and baseflow as a fraction of precipitation and total streamflow (baseflow index, BFI) were determined. Much of the variability in baseflow metrics was explained by such characteristics as water-year precipitation, mean basin slope, spatial extent of outcrops of permeable sands and gravels, and forest and urban cover. Identified thresholds for basins with above- or below-average baseflow and BFI could serve as a screening tool in resource management decisions on the ORM. Precipitation has increased for many basins in the latter part of the twentieth and early part of the twenty-first century, often accompanied by greater baseflow. The rate of baseflow increase was related to the spatial extent of sand and gravel outcrops, implying a nonuniform response of baseflow to rising precipitation for basins across the ORM. Although baseflow from these basins may continue to increase under the wetter climate predicted for southern Ontario in the twenty-first century, such forecasts must consider the role of land-use change (e.g. forest expansion, urban development) in altering the partitioning of precipitation between direct runoff and baseflow contributions to streamflow.
机译：橡树岭冰a（ORM）是安大略省南部的一个重要水文地质特征，可提供饮用水以及重要的水生生态系统服务。溪流基流是ORM上的地下水向溪流中排放的有用指标，可深入了解区域水文地质系统。本研究探讨了气候和盆地属性如何解释流失ORM的基流指标中的时空格局。使用自动数字过滤器将基本流量与流量分离，并确定水年基本流量和基本流量，作为降水量和总流量的一部分（基本流量指数，BFI）。基流度量标准的大部分可变性是由诸如水年降水，平均盆地坡度，渗透性砂砾砾石露头的空间范围以及森林和城市覆盖区等特征来解释的。确定的底流高于或低于平均水平的盆地和BFI的阈值可以用作ORM资源管理决策中的筛选工具。在二十世纪后期和二十一世纪初，许多盆地的降水增加，通常伴随着更大的基流。基流增加速率与砂砾砾石露头的空间范围有关，这意味着整个ORM盆地的基流对降水增加的响应不均匀。尽管在二十一世纪安大略省南部的潮湿气候预测下，这些盆地的底流可能会继续增加，但此类预测必须考虑土地利用变化（例如森林扩张，城市发展）在改变降水量分配之间的作用。直接径流和基流对流量的贡献。

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  • 来源
    《Canadian Water Resources Journal》 |2015年第1期|3-22|共20页
  • 作者

    Buttle J. M.; Greenwood W. J.; Gerber R. E.;

  • 作者单位

    Trent Univ, Dept Geog, Peterborough, ON K9J 7B8, Canada;

    Trent Univ, Environm & Life Sci Grad Program, Peterborough, ON K9J 7B8, Canada;

    York Peel Durham Toronto Conservat Author Moraine, Oak Ridges Moraine Hydrogeol Program, Downsview, ON, Canada;

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