L773:0169 555X
Sökning: L773:0169 555X > Knickpoint retreat ...
- Castillo, Miguel (författare)
Knickpoint retreat and transient bedrock channel morphology triggered by base-level fall in small bedrock river catchments : The case of the Isle of Jura, Scotland
- Artikel/kapitelEngelska2013
Förlag, utgivningsår, omfång ...
- Elsevier BV,2013
- printrdacarrier
Nummerbeteckningar
- LIBRIS-ID:oai:DiVA.org:su-87151
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-87151URI
- https://doi.org/10.1016/j.geomorph.2012.08.023DOI
Kompletterande språkuppgifter
- Språk:engelska
- Sammanfattning på:engelska
Ingår i deldatabas
- SwePubSwePub
Klassifikation
Anmärkningar
- AuthorCount:3;
- A sudden drop in river base-level can trigger a knickpoint that propagates throughout the fluvial network causing a transient state in the landscape. Knickpoint retreat has been confirmed in large fluvial settings (drainage areas > 100 km(2)) and field data suggest that the same applies to the case of small bedrock river catchments (drainage areas < 100 km(2)). Nevertheless, knickpoint recession on resistant lithologies with structure that potentially affects the retreat rate needs to be confirmed with field-based data. Moreover, it remains unclear whether small bedrock rivers can absorb base-level fall via knickpoint retreat. Here we evaluate the response of small bedrock rivers to base-level fall on the isle of Jura in western Scotland (UK), where rivers incise into dipping quartzite. The mapping of raised beach deposits and strath terraces, and the analysis of stream long profiles, were used to identify knickpoints that had been triggered by base-level fall. Our results indicate that the distance of knickpoint retreat scales to the drainage area in a power law function irrespective of structural setting. On the other hand, local channel slope and basin size influence the vertical distribution of knickpoints. As well, at low drainage areas (similar to 4 km(2)) rivers are unable to absorb the full amount of base-level fall and channel reach morphology downstream of the knickpoint tends towards convexity. The results obtained here confirm that knickpoint retreat is mostly controlled by stream discharge, as has been observed for other transient landscapes. Local controls, reflecting basin size and channel slope, have an effect on the vertical distribution of knickpoints; such controls are also related to the ability of rivers to absorb the base-level fall.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Geovetenskap och miljövetenskap Naturgeografi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Physical Geography hsv//eng
- NATURVETENSKAP Geovetenskap och miljövetenskap Multidisciplinär geovetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geosciences, Multidisciplinary hsv//eng
- Bedrock river
- Knickpoint retreat
- Base-level fall
- Transience
- Stream discharge
- Channel slope
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Bishop, Paul (författare)
- Jansen, John D.Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)(Swepub:su)jojan (författare)
- Stockholms universitetInstitutionen för naturgeografi och kvartärgeologi (INK) (creator_code:org_t)
Sammanhörande titlar
- Ingår i:Geomorphology: Elsevier BV180, s. 1-90169-555X1872-695X
Internetlänk
Hitta mer i SwePub
- Av författaren/redakt...
- Castillo, Miguel
- Bishop, Paul
- Jansen, John D.
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Geovetenskap och ...
- och Naturgeografi
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Geovetenskap och ...
- och Multidisciplinär ...
- Artiklar i publikationen
- Geomorphology
- Av lärosätet
- Stockholms universitet
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
