At http://www.tdr.cesca.es/TDX-0630107-193135/index_cs.html "Es plantegen dues escales d'estudi: conca i llera fluvial." is translated by author as "Two study scales are faced: basin and riverbed."

In your context, perhaps you could simply say 'stony dry riverbed'? However, depending on how steep it was, it might also be possible to call it a 'scree gully'.

HTH



Sheila

See also:

http://www.iberianature.com/material/glossaryg.htm

glera ( Arag ) : scree

http://www.iberianature.com/material/glossaryl.htm

llerones/lleronas/llerizasa (Cant) : screes, extensive stony areas caused by torrents :


gully:


deep ditch cut by running water (especially after a prolonged downpour)
wordnet.princeton.edu/perl/webwn
A gully is a landform created by running water eroding sharply into soil, typically on a hillside. Gullies resemble large ditches or small valleys, but are metres to tens of metres in height and width.
en.wikipedia.org/wiki/Gully
the fielding position between point and slips.
www.hintsandthings.co.uk/games/cricket.htm
a long, linear depression incised into steep hillslopes, where the overall gradient is at least 25%, with a channel confined in a V-notch ravine with banks higher than 3 m, sideslopes steeper than 40%, and an overall length greater than 100 m.
www.env.gov.bc.ca/wld/documents/wrp/wrt6/glossary.html
a trench worn in the earth by running water.
www.wef.org/LearnAboutWater/ForThePublic/WaterTerms/
an erosional channel or ravine.
park.org/Philippines/pinatubo/page7.html




Weekly Route - Carrauntoohil - OUTDOORSmagic Walking
After 1.6km you meet the Gaddagh River, which has to be forded. ... The scree gully becomes more scree filled as you descend, with the impressive, ...
www.outdoorsmagic.com/news/article/mps/uan/4143 - 79k - Còpia en memòria - Pàgines semblants
Bidean nam Bian (Walk Highlands)
The scree gully leading down is very eroded, but there is a 'path' of sorts ... down into Glen Coe and crossing the river on a bridge high above the waters. ...
www.walkhighlands.co.uk/fortwilliam/bideannambian.shtml - 17k - Còpia en memòria - Pàgines semblants
Mountain and River Adventures In Scotland: Borrowdale Fell Race ...
Mountain and River Adventures In Scotland ... race organisers had suggested a “safe” route but the majority were opting for an incredibly steep scree gully. ...
mountainriver.blogspot.com/2005/ 08/borrowdale-fell-race-6th-august-2005.html - 22k - Còpia en memòria - Pàgines semblants

glera is the dry river bed, full of stones