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Changes in floods and flood regimes in Canada

机译：加拿大洪水和洪水制度的变化

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Flood events in Canada result in larger costs, in terms of property damage, than any other natural disaster. Changes in land use, and more recently the impacts of climate change, can lead to changes in the flood regime. This paper describes research examining changes in the flood regime for watersheds across Canada. To distinguish between changes resulting from land-use changes and those occurring due to changes in climate, the analysis of flood data is conducted only on watersheds that are either part of a formal Reference Hydrologic Network (RHN), or which exhibit RHN-like characteristics. A total of 280 gauging stations have been analyzed for changes to a number of attributes of the flood regime. Changes in the magnitude and timing of flood events as well as the frequency and duration of high-flow events are examined for all 280 sites. Using all 280 sites and different groupings of the sites, based on timing of floods, drainage area and the RHN designation, changes were determined in the annual number of sites at which the flow exceeded the 25-, 50- and 100-year return period events. An examination of the results leads to important insights into the nature of changes that are occurring in the flood regimes in Canada. The results have important implications for the design of hydraulic infrastructure, flood preparedness and the provision of adequate flood protection for populations at risk.
机译：就财产损失而言，加拿大的洪灾比其他自然灾害造成的损失更大。土地利用的变化，以及最近气候变化的影响，都可能导致洪水制度的变化。本文介绍了研究加拿大整个流域洪水制度变化的研究。为了区分土地利用变化引起的变化和气候变化引起的变化，仅对属于正式参考水文网络（RHN）或具有类似RHN特征的流域进行洪水数据分析。分析了总共280个测量站的洪水状况的许多属性。对所有280个地点的洪水事件的大小和时间变化以及高流量事件的频率和持续时间进行了检查。根据洪水发生的时间，流域和RHN的名称，使用所有280个站点和不同的站点组，确定流量超过25年，50年和100年回归期的站点的年数量变化事件。对结果的检查可以使人们对加拿大洪水制度中变化的性质有重要的认识。这些结果对水力基础设施的设计，防洪工作以及为处于危险中的人群提供适当的防洪保护具有重要意义。

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  • 来源
    《Canadian Water Resources Journal》 |2016年第2期|139-150|共12页
  • 作者

    Burn Donald H.; Whitfield Paul H.;

  • 作者单位

    Univ Waterloo, Civil & Environm Engn, Waterloo, ON N2L 3G1, Canada;

    Univ Saskatchewan, Ctr Hydrol, Saskatoon, SK, Canada|Simon Fraser Univ, Dept Earth Sci, Burnaby, BC V5A 1S6, Canada|Environm Canada, Vancouver, BC, Canada;

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