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Massive incision and outcropping of bedrock in a former braided river attributed to mining and training

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10.1016/j.geomorph.2023.108774
 
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hdl:2117/390803

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Ferrer Boix, CarlesMés informacióMés informacióMés informació
Scorpio, Vittoria
Martín Vide, Juan PedroMés informacióMés informacióMés informació
Núñez González, FranciscoMés informacióMés informació
Mora Mur, Daniel
Document typeArticle
Defense date2023-09
Rights accessRestricted access - publisher's policy (embargoed until 2025-09-12)
Attribution-NonCommercial-NoDerivs 4.0 International
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 4.0 International
Abstract
This research analyses multiple anthropogenic pressures in the Bernesga River, a gravel-bed river in Northwestern Iberian Peninsula. Among the causes of river incision in Bernesga River are extensive mining during the second half of the twentieth century, a 100 years-long history of channelization and river training starting around 1900, and to a lesser extent, land-use changes in the basin. As a result of these impacts, reach-averaged incision exceeds 8.5 m. Severe incision occurred simultaneously with a dramatic change in channel pattern: from 450 m-wide braided morphology around middle of the twentieth century to a narrow single-thread 40 m wide) channel in 2017. Quaternary alluvial deposits have been mostly depleted exposing the underlying bedrock. Unlike other rivers, bedrock outcrops have not stopped incision. Extremely narrow channels (12 m wide) have developed and incised at rates of 0.11 m/yr into bedrock materials, headcuts have formed on bedrock deposits and have rapidly retreated (at 33 m/yr) and the channel has incised forming adverse slopes under the presence of bed sills. Cause-effect relationships of cumulative impacts have been established between the recent evolutionary trajectory of the Bernesga River and multiple and simultaneous anthropogenic pressures.
CitationFerrer-Boix, C. [et al.]. Massive incision and outcropping of bedrock in a former braided river attributed to mining and training. "Geomorphology", Setembre 2023, vol. 436, núm. article 108774. 
URIhttp://hdl.handle.net/2117/390803
DOI10.1016/j.geomorph.2023.108774
ISSN0169-555X
Publisher versionhttps://www.sciencedirect.com/science/article/abs/pii/S0169555X23001940
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