Next Article in Journal
Spatiotemporal Variations in Snow and Soil Frost—A Review of Measurement Techniques
Next Article in Special Issue
Rainfall Simulator Experiments to Investigate Macropore Impacts on Hillslope Hydrological Response
Previous Article in Journal
Impacts of Rainfall Variability, Land Use and Land Cover Change on Stream Flow of the Black Volta Basin, West Africa
Previous Article in Special Issue
Runoff and Soil Erosion Assessment on Forest Roads Using a Small Scale Rainfall Simulator
Article Menu

Export Article

Open AccessArticle
Hydrology 2016, 3(3), 27; doi:10.3390/hydrology3030027

Conditions for the Occurrence of Slaking and Other Disaggregation Processes under Rainfall

1
INRA, UR0272, UR Science du sol, F-45075 Orléans, France
2
Soil Science Department, Universidade Federal do Piauí, Campus Professora Cinobelina Elvas (CPCE/UFPI), Bom Jesus, PI 64900-000, Brazil
3
Departamento de Ciência do Solo, Escola Superior de Agricultura ‘‘Luiz de Queiroz’’, Universidade de São Paulo (ESALQ/USP), Piracicaba, SP 13418-900, Brazil
Presently at: Inra, Laboratoire Sols et Environnement, UMR 1120, Vandoeuvre-lès-Nancy, F-54518, France
*
Author to whom correspondence should be addressed.
Academic Editors: Thomas Iserloh and Artemi Cerdà
Received: 26 April 2016 / Revised: 25 June 2016 / Accepted: 30 June 2016 / Published: 5 July 2016
View Full-Text   |   Download PDF [1871 KB, uploaded 6 July 2016]   |  

Abstract

Under rainfall conditions, aggregates may suffer breakdown by different mechanisms. Slaking is a very efficient breakdown mechanism. However, its occurrence under rainfall conditions has not been demonstrated. Therefore, the aim of this study was to evaluate the occurrence of slaking under rain. Two soils with silt loam (SL) and clay loam (CL) textures were analyzed. Two classes of aggregates were utilized: 1–3 mm and 3–5 mm. The aggregates were submitted to stability tests and to high intensity (90 mm·h−1) and low intensity (28 mm·h−1) rainfalls, and different kinetic energy impacts (large and small raindrops) using a rainfall simulator. The fragment size distributions were determined both after the stability tests and rainfall simulations, with the calculation of the mean weighted diameter (MWD). After the stability tests the SL presented smaller MWDs for all stability tests when compared to the CL. In both soils the lowest MWD was obtained using the fast wetting test, showing they were sensitive to slaking. For both soils and the two aggregate classes evaluated, the MWDs were recorded from the early beginning of the rainfall event under the four rainfall conditions. The occurrence of slaking in the evaluated soils was not verified under the simulated rainfall conditions studied. The early disaggregation was strongly related to the cumulative kinetic energy, advocating for the occurrence of mechanical breakdown. Because slaking requires a very high wetting rate on initially dry aggregates, it seems unlikely to occur under field conditions, except perhaps for furrow irrigation. View Full-Text
Keywords: aggregate stability; simulated rainfall; aggregate breakdown; slaking aggregate stability; simulated rainfall; aggregate breakdown; slaking
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Darboux, F.; Dalla Rosa, J.; Cooper, M. Conditions for the Occurrence of Slaking and Other Disaggregation Processes under Rainfall. Hydrology 2016, 3, 27.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Hydrology EISSN 2306-5338 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top