Detachment of road surface soil by flowing water

Auteur(s) et Affiliation(s)

CAO, L.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

ZHANG, K.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

ZHANG, W.

State Key Lab. of Earth Surface Processes and Resource Ecology, Normal Univ., Beijing, Chine

Description :
The results illustrate that road surfaces behave characteristically in the runoff detachment and sediment delivery process due to the difference in the bulk density and functions of agricultural soils. The soil detachment rate is closely related to flow depth, slope gradient and other hydraulic parameters such as shear stress, stream power and unit stream power. Multiple non-linear regression analyses indicate that detachment rates for all roads can be accurately predicted by power functions of flow depth and slope gradient. According to the experimental results, stream power was suggested as an indicator to estimate soil detachment rate instead of shear stress in soil erosion models. However, considering the simplicity and availability, power function of flow depth and slope gradient is also recommended to predict detachment rate on the road surfaces.

Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2009, vol. 76, n°. 2, p. 155-162, nombre de pages : 8, Références bibliographiques : 28 ref.

Date :
2009

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

Langue :
Anglais