Lichenometric dating of slope movements, Nant Ffrancon, North Wales

Biogeomorphology. Special issue

Auteurs :
WINCHESTER, V.
CHAUJAR, R.K.
VILES, H.A.

Description :
This study provides an insight into the extent and frequency of previous debris flows to permit a fuller assessment of slope stability in this hazard-prone location, the main A5 road in Nant Ffrancon. It uses 2 approaches to lichenometry to date earlier debris flows : dating estimates based on size/age correlations of Rhizocarpon geographicum prospectans growing in 2 local churchyards; population size frequency distributions with size increments dated using the churchyard growth rate. The results suggest that these slopes have a history of periodic debris flows covering at least the last 110 years.


Type de document :
Congrès

Source :
RGS-IBG meeting, Plymouth, Royaume-Uni, 2001-01, Geomorphology (Amsterdam), issn : 0169-555X, 2002, vol. 47, n°. 1, p. 61-74, nombre de pages : 14, Collation : Illustration, Références bibliographiques : 43 ref.

Date :
2002

Editeur :
Pays édition : Pays-Bas, Amsterdam, Elsevier