Comparing the Sources of Sediment Retained by Beaver Dams and Beaver Dam Analogs

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Cherie J. Westbrook, David J. Cooper
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引用次数: 0

Abstract

Beavers modify riverine systems by building dams that alter downstream fluxes of water and sediment. Where beavers have been lost and stream channels degraded, beaver dam analogs (BDAs) are being used to mimic the effects of beaver engineering. Central to the success of these structures in accelerating stream recovery is creating similar ecosystem responses as beaver dams including sediment retention. Unknown is the relative importance of beaver actions versus erosion in the catchment in generating the retained sediment. This study tested the viability of sediment fingerprinting to determine the source of sediment retained by beaver dams and BDAs in a watershed in Alberta, Canada. Concentrations of 29 elements were measured as potential tracers from known sediment sources: upland, terrace, stream bank, and beaver canal. Virtual mixture tests, used to compare the computed source estimates with known source mixtures, revealed that sediment fingerprinting is a robust method for identifying sources of sediment retained by beaver ponds and BDAs. The un-mixing model results indicate that on average 56% of the sediment retained by the beaver dams originated from terraces, 23% from uplands, and 13% from beaver canals. About 89% of sediment retained by the BDAs originated from eroding stream banks. We conclude that the geomorphic effects of beavers and their dams are more diverse, resulting in more diverse sources of sediment retained by their dams. This differentiates beaver dams from BDAs. The study has implications for informing management practices that involve beavers and beaver mimicry.
比较海狸坝和海狸坝类似物截留的沉积物来源
海狸通过筑坝改变下游的水流和沉积物,从而改变河流系统。在海狸消失、河道退化的地方,海狸筑坝模拟物(BDAs)被用来模拟海狸工程的效果。这些结构在加速溪流恢复方面取得成功的关键在于产生了与海狸坝类似的生态系统反应,包括沉积物滞留。目前尚不清楚的是,在产生滞留沉积物的过程中,海狸行动与集水区侵蚀的相对重要性。这项研究测试了沉积物指纹识别法的可行性,以确定加拿大艾伯塔省一个流域内海狸坝和 BDA 所截留沉积物的来源。测量了 29 种元素的浓度,作为已知沉积物来源的潜在示踪剂:高地、阶地、河岸和海狸渠。虚拟混合物测试用于将计算出的来源估计值与已知来源混合物进行比较,结果表明,沉积物指纹识别法是确定海狸塘和 BDA 所截留沉积物来源的可靠方法。非混合模型结果表明,海狸坝截留的沉积物平均 56% 来自阶地,23% 来自高地,13% 来自海狸渠。海狸坝截留的泥沙约有 89% 来自侵蚀的河岸。我们得出的结论是,海狸及其水坝的地貌效应更加多样化,导致其水坝截留的沉积物来源也更加多样化。这也是海狸坝与BDA的区别所在。这项研究对涉及海狸和海狸模仿的管理实践具有指导意义。
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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