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Identification of geographical influences and flow regime characteristics using regional water isotope surveys in the lower Nelson River, Canada

机译：使用加拿大尼尔森河下游的区域水同位素调查确定地理影响和流态特征

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摘要

Results are reported from a 3-year monitoring initiative (2010-2013) of stable water isotopes (delta O-18 and delta H-2) at over 50 hydrometric sites in the lower portion of the Nelson River Basin, a key freshwater-marine corridor in Canada with global significance. Data are collected from annual synoptic surveys and a time-series monitoring program. Water isotope signals exhibit significant long-term average (with reported standard deviation) differences between the upper Nelson River (-10.5 parts per thousand delta O-18 +/- 0.18 parts per thousand) and Burntwood River (i.e. Churchill Basin; -12.8 parts per thousand delta O-18 +/- 0.4 parts per thousand) regions which are attributed to the geographic extent and origin of the water. Upper Nelson River flow-isotope signals suggest a more temperate climate, and exhibit reverse seasonal cycling (i.e. ice-on isotope enrichment; ice-off isotope depletion) due to the connectivity with and influence of Lake Winnipeg. In contrast, the Burntwood River behaves like a snowmelt-dominated river heavily influenced by wetland storage and enrichment during ice-off periods, exhibiting isotopic signals negatively correlated with headwater river discharge. Flow-weighted delta O-18 and delta H-2 show decreased variability in both regions at extreme low- and high-flow regimes, indicating a tendency towards a single dominant end member: wetland release (low-flow regime) or snowmelt/rainfall (high-flow regime). Mid- to normal-flow regimes exhibit increased isotopic variability, as do small headwater catchments resulting from varied source water contributions, residence times, mixing patterns and the role of landscape-specific features. The Stable Water Isotope Monitoring Network (SWIMN) presented enables the closure of water-isotope mass balance modelling that will facilitate the understanding of changes to freshwater-marine linkages.
机译：一项为期3年的监测计划（2010-2013年）报告了结果，该监测计划是对关键的淡水海洋纳尔逊河流域下游地区50多个水文站点的稳定水同位素（δO-18和δH-2）进行监测的结果具有全球意义的加拿大走廊。数据是从年度天气调查和时间序列监视程序中收集的。水同位素信号在尼尔森河上游（-10.5千分之一的O-18 +/- 0.18千分之一）和伯恩伍德河（即丘吉尔盆地； -12.8份）之间表现出显着的长期平均值（具有报告的标准偏差）每千个三角洲O-18 +/- 0.4千分之一）区域，这归因于水的地理范围和来源。由于与温尼伯湖的连通性和影响，尼尔森河上游的同位素指示出气候更为温和，并表现出反向的季节性循环（即冰上同位素富集;冰上同位素枯竭）。相反，伯恩伍德河表现得像融雪为主的河流，在结冰期受到湿地存储和富集的影响很大，其同位素信号与源头河流量负相关。流量加权的增量O-18和增量H-2在极端低流量和高流量情况下在两个区域均显示出降低的变异性，表明趋向于一个单一的主要末端成员：湿地释放（低流量情况）或融雪/降雨（高流量状态）。中等流量至正常流量状态显示出增加的同位素变异性，源水贡献不同，停留时间，混合模式和特定景观特征作用导致的小源头集水区也是如此。提出的稳定水同位素监测网络（SWIMN）能够关闭水-同位素质量平衡模型，这将有助于了解淡水与海洋之间的联系。

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  • 来源
    《Canadian Water Resources Journal》 |2015年第1期|23-35|共13页
  • 作者

    Smith Aaron; Delavau Carly; Stadnyk Tricia;

  • 作者单位

    Univ Manitoba, Dept Civil Engn, Winnipeg, MB R3T 2N2, Canada;

    Univ Manitoba, Dept Civil Engn, Winnipeg, MB R3T 2N2, Canada;

    Univ Manitoba, Dept Civil Engn, Winnipeg, MB R3T 2N2, Canada;

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