Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028859 |
Morphodynamics of boulder‐bed semi‐alluvial streams in northern Fennoscandia: a flume experiment to determine sediment self‐organization | |
L. E. Polvi | |
2021-02-08 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | In northern Fennoscandia, semi‐alluvial boulder‐bed channels with coarse glacial legacy sediment are abundant, and due to widespread anthropogenic manipulation during timber‐floating, unimpacted reference reaches are rare. The landscape context of these semi‐alluvial rapids— with numerous mainstem lakes that buffer high flows and sediment connectivity in addition to a regional low sediment yield— contribute to low amounts of fine sediment and incompetent flows to transport boulders. To determine the morphodynamics of semi‐alluvial rapids and potential self‐organization of sediment with multiple high flows, a flume experiment was designed and carried out to mimic conditions in semi‐alluvial rapids in northern Fennoscandia. Two slope setups (2% and 5%) were used to model a range of flows (Q1 (summer high flow), Q2, Q10 & Q50) in a 8 x 1.1 m flume with a sediment distribution analogous to field conditions; bed topography was measured using structure‐from‐motion photogrammetry after each flow to obtain DEMs. No classic steep coarse‐bed channel bedforms (e.g., step‐pools) developed. However, similarly to boulder‐bed channels with low relative submergence, at Q10 and Q50 flows, sediment deposited upstream of boulders and scoured downstream. Because the Q50 flow was not able to re‐work the channel by disrupting grain‐interlocking from preceding lower flows, transporting boulders, or forming channel‐spanning boulders, the channel‐forming discharge is larger than the Q50. These results have implications for restoration of gravel spawning beds in northern Fennoscandia and highlight the importance of large grains in understanding channel morphodynamics. |
领域 | 资源环境 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/313885 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | L. E. Polvi. Morphodynamics of boulder‐bed semi‐alluvial streams in northern Fennoscandia: a flume experiment to determine sediment self‐organization[J]. Water Resources Research,2021. |
APA | L. E. Polvi.(2021).Morphodynamics of boulder‐bed semi‐alluvial streams in northern Fennoscandia: a flume experiment to determine sediment self‐organization.Water Resources Research. |
MLA | L. E. Polvi."Morphodynamics of boulder‐bed semi‐alluvial streams in northern Fennoscandia: a flume experiment to determine sediment self‐organization".Water Resources Research (2021). |
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