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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Catchment size and contribution of the largest daily events to suspended sediment load on a continental scale

Scales in soil erosion

Auteur(s) et Affiliation(s)

Dept. of Geography, Univ., Zaragoza, Espagne
ISAC-CNR, Bologna, Italie
BATALLA, R.J.
Dep. of Environment and Soil Sciences, Univ., Lleida, Espagne
Forest Science Center of Catalonia, Solsona, Espagne
CERDA, A.
Dept. of Geography, Univ., Valencia, Espagne
CERDÀ, A.
Soil Erosion and Degradation Research Group (SEDER), Dept. de Geografia, Univ., Valencia, Espagne
BRAZIER, R.
Geography, College of Life and Environmental Sciences, Univ., Exeter, Royaume-Uni
NEARING, M.
USDA-ARS Southwest Watershed Research Center, AZ, Tucson, Etats-Unis
DE VENTE, J.
Estación Experimental de Zonas Áridas, Consejo Sup. de Investigaciones Científicas (EEZA-CSIC), Desertification and Geoecology Dept., Almeria, Espagne


Description :
The AA. used 2 massive datasets of daily suspended sediment load facilitated by the United States Geological Survey (i.e. USGS Ancillary database), and the Hydrological Service of Canada (i.e. HYDAT dataset). The whole study area covers most of the temperate and sub-polar latitudinal climate conditions. The data from more than 1800 catchments show that the contribution of few events represents a high proportion of the total basin suspended sediment load. The analysis suggests that the relative contribution of different n-largest aggregated daily events on total suspended sediment load decreases as catchment size increases. This is a general pattern and means that, for instance, time compression of suspended load is exacerbated in small catchments; hence, relatively few events are the key to explain the catchment sediment export. In addition, the relative contribution of the n-largest daily event to the suspended sediment load seems to be independent of climate conditions in small catchments.


Type de document :
Article de monographie

Source :
Catena (Giessen), issn : 0341-8162, 2013, vol. 102, p. 40-45, nombre de pages : 6, Références bibliographiques : 41 ref.

Date :
2013

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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