onr:"swepub:oai:DiVA.org:su-59398"
Search: onr:"swepub:oai:DiVA.org:su-59398" > Connectivity analys...
- 1 of 1
- Previous record
- Next record
- To hitlist
- Sahlin, Eva A. U.Högskolan i Gävle,Ämnesavdelningen för samhällsbyggnad (author)
Connectivity analyses of valley patterns indicate preservation of a preglacial fluvial valley system in the Dyfi basin, Wales
- Article/chapterEnglish2009
Publisher, publication year, extent ...
- Elsevier BV,2009
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-59398
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-59398URI
- https://doi.org/10.1016/j.pgeola.2009.10.001DOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-10293URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- authorCount :4
- Coastal valleys in the west part of Mid-Wales, such as the Mawddach, Dysynni, Tal-y-Ilyn and Dyfi, acted as corridors for ice which drained the Welsh Ice Cap during the Devensian. Analyses of detailed digital elevation models, and interpretation of satellite images and aerial photographs, show the existence of large variations in the amount of glacial modification between these valleys. Although all the valleys are glacially over-deepened along late Caledonian fault lines, only the Dyfi basin exhibits a dendritic pattern, with V-shaped cross-profiles and valley spurs typical of valleys formed by fluvial processes. Connectivity analysis of the Dyfi basin shows that it exhibits an almost completely dendritic pattern with connectivity alpha and beta values of 0.74 and 1.01, respectively, with little glacial modification of the preglacial fluvial valley pattern in the form of glacial valley breaching. Several examples of glacial meltwater incision into a well-developed pre-existing river valley system, causing river capture across watersheds, have been identified in the Dyfi basin. The degree of preservation of the preglacial fluvial valley system within the Dyfi basin indicates limited modification by glacial processes, despite the area being subjected to glacier activity during the Late Devensian at least. It is possible that major parts of the basin were covered by cold-based or slow-moving ice, close to, or under, a migrating ice-divide, with the major ice drainage Occurring along the weaker zone of the Pennal Fault along which teh Dyfi valley is located, causing minor adjustments to the Surrounding interfluves and uplands. it is proposed here that the general river valley morphology of the Dyfi basin is of a pre-Late Devensian age.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
- Valley connectivity
- Palaeoglaciological reconstruction
- Glacial erosion
- Preglacial drainage pattern
- Dyfi
- Wales
- Earth sciences
- Geovetenskap
Added entries (persons, corporate bodies, meetings, titles ...)
- Glasser, Neil F.Institute of Geography and Earth Sciences, University of Wales, Aberystwyth, United Kingdom (author)
- Jansson, Krister N.Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK),Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden(Swepub:su)krister (author)
- Hambrey, Michael J.Institute of Geography and Earth Sciences, University of Wales, Aberystwyth, United Kingdom (author)
- Högskolan i GävleÄmnesavdelningen för samhällsbyggnad (creator_code:org_t)
Related titles
- In:Proceedings of the Geologists' Association: Elsevier BV120, s. 245-2550016-7878
Internet link
Find in a library
- Proceedings of the Geologists' Association (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Sahlin, Eva A. U ...
- Glasser, Neil F.
- Jansson, Krister ...
- Hambrey, Michael ...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Earth and Relate ...
- Articles in the publication
- Proceedings of t ...
- By the university
- Stockholm University
- University of Gävle
Search outside SwePub
- Extend your search to:
- 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 - National Library Systems
- LIBRIS.kb.se
