Laboratory soil piping and internal erosion experiments : evaluation of a soil piping model for low-compacted soils

Auteur(s) et Affiliation(s)



Description :
This study utilized a soil box to conduct constant-head, soil pipe and internal erosion experiments for 2 low-compacted soils (clay loam from Dry Creek and sandy loam from Cow Creek streambanks). Flow rates and sediment concentrations were measured from the pipe outlet. Replicate submerged jet erosion tests (JETs) were conducted to derive erodibility parameters for repacked samples at the same moisture contents. Flow rates from the box experiments were used to calibrate the mechanistic model. The influence of the initial moisture content was apparent, with some pipes (8% moisture content) expanding so fast that limited data was collected. The mechanistic model was able to estimate equivalent flow rates to those observed in the experiments, but had difficulty matching observed sediment concentrations when the pipes rapidly expanded. The JETs predicted similar erodibility coefficients compared to the mechanistic model for the more erodible cases but not for the less erodible cases (14% moisture content). Therefore, improved models are needed.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 9, p. 1137-1145, nombre de pages : 9, Références bibliographiques : 1 p.

Date :
2014

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