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Terra Latinoamericana

versão On-line ISSN 2395-8030versão impressa ISSN 0187-5779

Resumo

RODRIGUEZ-BLANCO, M. L. et al. Sediment Export during Rainfall Runoff Events: Influence of Rills and Ephemeral Gullies. Terra Latinoam [online]. 2011, vol.29, n.3, pp.309-314. ISSN 2395-8030.

This work attempts to identify the source of suspended sediment caused by seven rainfall events in a small river basin located in NW of Spain used sediment agroforestry. Water discharge and suspended sediment concentrations were measured during these rainfall events at the catchment outlet and hysteretic loops of the relationship suspended sediment concentration versus discharge were established. In addition, within the catchment regular surveys were conducted in order to obtain data on the suspended sediment sources. The events studied occurred in autumn, a period during which some plots of the basin were without vegetation. In most of the events clockwise hysteresis loops were described, the sediment peaks occurred prior to or with peaks discharge. Field observations indicated that sediment discharged from the rills and ephemeral gullies, formed in a bare field located in the head of the catchment, represents the most important source of suspended sediment in this catchment during the study period.

Palavras-chave : rainfall; sediment peak; peak discharge; erosion; bare soil.

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