Processes and forms of an unstable alluvial system with resistant, cohesive streambeds

Auteurs :
SIMON, A.
THOMAS, R.E.

Description :
As a response to channelization projects undertaken near the turn of the 20th century and in late 1960s, upstream reaches and tributaries of the Yalobusha River, Mississippi, have been rejuvenated by upstream-migrating knickpoints. Sediment and woody vegetation delivered to the channels by mass failure of sreambanks has been transported downstream to form a large sediment/debris plug where the downstream end of the channelized reach joins an unmodified sinuous reach. Classification within a model of channel evolution and analysis of thalweg elevations and channel slopes indicates that downstream reaches have equilibrated but that upstream reaches are actively degrading.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2002, vol. 27, n°. 7, p. 699-718, nombre de pages : 20, Collation : Illustration, Références bibliographiques : 44 ref.

Date :
2002

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