| Autor: |
Ferrer Boix, Carles, Scorpio, Vittoria, Martín Vide, Juan Pedro, Núñez González, Francisco, Mora Mur, Daniel |
| Přispěvatelé: |
Universitat Politècnica de Catalunya. Departament d’Enginyeria Gràfica i de Disseny, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. CRAHI - Centre de Recerca Aplicada en Hidrometeorologia |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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