Publications des scientifiques de l'IRD

Mugler C., Ribolzi Olivier, Viguier Marion, Janeau Jean-Louis, Jarde E., Latsachack K., Henry des Tureaux Thierry, Thammahacksa C., Valentin Christian, Sengtaheuanghoung O., Rochelle-Newall Emma. (2021). Experimental and modelling evidence of splash effects on manure borne Escherichia coli washoff. Environmental Science and Pollution Research, 28 (25), 33009-33020. ISSN 0944-1344.

Titre du document
Experimental and modelling evidence of splash effects on manure borne Escherichia coli washoff
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000622284400019
Auteurs
Mugler C., Ribolzi Olivier, Viguier Marion, Janeau Jean-Louis, Jarde E., Latsachack K., Henry des Tureaux Thierry, Thammahacksa C., Valentin Christian, Sengtaheuanghoung O., Rochelle-Newall Emma
Source
Environmental Science and Pollution Research, 2021, 28 (25), 33009-33020 ISSN 0944-1344
In tropical montane South-East Asia, recent changes in land use have induced increased runoff, soil erosion and in-stream suspended sediment loads. Land use change is also contributing to increased microbial pathogen dissemination and contamination of stream waters. Escherichia coli (E. coli) is frequently used as an indicator of faecal contamination. Field rain simulations were conducted to examine how E. coli is exported from the surface of upland, agricultural soils during runoff events. The objectives were to characterize the loss dynamics of this indicator from agricultural soils contaminated with livestock waste, and to identify the effect of splash on washoff. Experiments were performed on nine 1 m(2) plots, amended or not with pig or poultry manure. Each plot was divided into two 0.5 m(2) sub-plots. One of the two sub-plots was protected with a mosquito net for limiting the raindrop impact effects. Runoff, soil detachment by raindrop impact and its entrainment by runoff, and E. coli loads and discharge were measured for each sub-plot. The results show that raindrop impact strongly enhances runoff generation, soil detachment and entrainment and E. coli export. When the impact of raindrops was reduced with a mosquito net, total runoff was reduced by more than 50%, soil erosion was on average reduced by 90% and E. coli export from the amended soil surface was on average 3 to 8 times lower. A coupled physics-based approach was performed using the Cast3M platform for modelling the time evolutions of runoff, solid particles detachment and transfer and bacteria transport that were measured for one of the nine plots. After estimation of the saturated hydraulic conductivity, soil erodibility and attachment rate of bacteria, model outputs were consistent with measured runoff coefficients, suspended sediment and E. coli loads. This work therefore underlines the need to maintain adequate vegetation at the soil surface to avoid the erosion and export of soil borne potential pathogens towards downstream aquatic systems.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Pollution [038] ; Hydrologie [062] ; Biotechnologies [084]
Description Géographique
LAOS
Localisation
Fonds IRD [F B010081037]
Identifiant IRD
fdi:010081037
Contact