Sediment production and yield from an alluvial gully in northern Queensland, Australia

Auteur(s) et Affiliation(s)



Description :
Sediment production, transport and yield were quantified over various timescales in response to rainfall and runoff within an alluvial gully, which erodes sodic soils of a small floodplain catchment along the Mitchell River, northern Australia. Historical air photographs and recent global positioning system (GPS) surveys and LiDAR data documented linear increases in gully area and volume, indicating that sediment supply has been consistent over the historic period. Daily time lapse photography of scarp retreat rates and internal erosion processes also demonstrated that erosion from rainfall and runoff consistently supplied fine washload sediment in addition to coarse lags of sand bed material. Total sediment yield estimated from empirical washload and theoretical bed material load was dominated by fine washload. A lack of hysteresis in suspended sediment rating curves, scarp retreat and sediment yield correlated to rainfall input, and an equilibrium channel outlet slope supported the hypothesis that partially or fully transport-limited conditions predominated along the alluvial gully outlet channel.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2013, vol. 38, n°. 15, p. 1765-1778, nombre de pages : 14, Références bibliographiques : 2 p.

Date :
2013

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