INVESTIGADORES
BUSCHIAZZO Daniel Eduardo
artículos
Título:
A wind-tunnel study on saltation and PM10 emission from agricultural soils
Autor/es:
AVECILLA, F.; PANEBIANCO, J. E.; BUSCHIAZZO, D. E.
Revista:
Aeolian Research
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2016 vol. 22 p. 73 - 83
Resumen:
PM10 emission depends on the texture and the aggregation state of a soil. A decisive but less studiedfactor is the saltation fraction of the soil (fraction between 100 and 500 lm). Six soils of contrasting textureswere selected, and a wind tunnel study was carried out under three different saltation conditions:increased saltation, in which a sample of the saltation fraction was added to the air stream prior to thesoil bed; no saltation added, in which the soil bed eroded without the addition of extra saltation fraction;and only saltation, in which the saltation fraction was injected into the air stream in the absence of thesoil bed. Results indicated that the saltation efficiency for PM10 emission increased with the fine fractioncontent of the soil and decreased with the sand content, but this process showed a complex behaviordepending on the cohesion and stability of the aggregates. An index for describing the saltation efficiencyof the studied soils was proposed based on the combination of three parameters: the PM10 content, theamount of saltation fraction available in the soil surface, and an aggregation parameter (clay organicmatter content). Increasing the saltation rate increased the PM10 emission from the eroding soil bed,except for the sandy soil. Results suggest that the main mechanisms of PM10 emission under saltationconditions differ according to the soil texture: detachment of the PM10 adhered to the grains of sandpredominates on sandy soils and fragmentation on finer soils, but both processes occur together onhigh-emitting soils of intermediate textures.