Planform cyclicity in an unstable reach : complex fluvial response to environmental change

Auteurs :
BREWER, P.A.
LEWIN, J.

Description :
Long- and short-term channel changes are documented and analysed for a historically unstable reach of the River Severn at Llandinam, mid-Wales. Long-term changes (the last 150 years), reconstructed from 10 archival sources, are characterized by channel planform switching between meandering (1836-1840 and 1948-1963) and braided (1884-1903 and 1975-present) phases. Short-term changes, monitored by detailed planform surveys over a 2.5 year period, showed smaller-scale channel adjustments involving channel switching, bar accretion and channel expansion. Flow regulation on the River Severn since 1968 has partly frozen the planform of the contemporary braid zone.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 1998, vol. 23, n°. 11, p. 989-1008, Collation : Illustration, Références bibliographiques : 2 p.

Date :
1998

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley