Beaver dam analogues (BDAs) are intended to simulate natural beaver dam ecohydrological functions including modifying stream hydrology and enhancing stream‐riparian hydrological connectivity. River restoration practitioners are proactively deploying BDAs in thousands of degraded streams. How various BDAs or their configurations impact stream hydrology and the riparian water table remains poorly understood. We investigated three types of BDA configurations (single, double and triple) in a spring‐fed Canadian Rocky Mountain stream over three study seasons (April–October; 2017–2019). All three BDA configurations significantly elevated the upstream stage. The deepest pools occurred upstream of the triple‐configuration BDAs (0.46 m) and the shallowest pools occurred upstream of the single‐configuration (0.36 m). Further, the single‐BDA configuration lowered stream stage and flow peaks below it but raised low flows. The double‐BDA configuration modulated flow peaks but had little influence on low flows. Unexpectedly, higher flow peaks and low flows were recorded below the triple‐BDA configuration, owing to groundwater seep. Similar to the natural beaver dam function, we observed an immediate water table rise in the riparian area after installation of the BDAs. The water table rise was greatest 2 m from the stream (0.14 m) and diminished with increasing lateral distance from the stream. Also noted was a reversal in the direction of flow between the stream and riparian area after BDA installation. Future research should further explore the dynamics of stream‐riparian hydrological connections under various BDA configurations and spacings, with the goal of identifying best practices for simulating the ecohydrological functions of natural beaver dams.

中文翻译：

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海狸大坝的模拟构造影响加拿大落基山脉退化的春季小河的河流和河岸水位动力学

海狸大坝类似物（BDAs）旨在模拟自然的海狸大坝的生态水文功能，包括修改河流水文学和增强河流-河岸水文连通性。河流恢复从业人员正在将BDA主动部署在成千上万条退化的河流中。各种BDA或它们的配置如何影响河流水文学和河岸水位，仍然知之甚少。我们在三个研究季节（4月至10月； 2017年至2019年）的春季喂养的加拿大落基山溪流中调查了三种类型的BDA配置（单，双和三）。所有这三个BDA配置都显着提高了上游阶段。最深的池发生在三配置BDA的上游（0.46 m），最浅的池发生在单配置BDA的上游（0.36 m）。进一步，单BDA配置降低了水位和流量峰值，但增加了低流量。双BDA配置可调节流量峰值，但对低流量几乎没有影响。出乎意料的是，由于地下水渗漏，在三重BDA配置下记录到了更高的流量峰值和更低的流量。与自然海狸大坝的功能类似，在安装BDA后，我们观察到河岸地区的地下水位立即上升。距水流2 m（0.14 m）处的地下水位上升最大，并且随着距水流侧向距离的增加而减小。还应注意的是，安装BDA后，溪流和河岸区之间的水流方向发生了逆转。未来的研究应进一步探索各种BDA配置和间距下的河河水文联系的动态，