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Granulometric characterization of sediments transported by surface runoff generated by moving storms

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dc.creator de Lima, J. L. M. P.
dc.creator Souza, C. C. S.
dc.creator Singh, V. P.
dc.date.accessioned 2011-03-30T17:06:11Z
dc.date.available 2011-03-30T17:06:11Z
dc.date.issued 2008-12-16
dc.identifier.citation de Lima, J. L. M. P., Souza, C. S., and Singh, V. P., (2008), Granulometric characterization of sediments transported by surface runoff generated by moving storms, Nonlinear Processes Geophysics, 15, doi:10.5194/npg-15-999-2008. To view the published open abstract, go to http://dx.doi.org and enter the DOI. en_US
dc.identifier.issn 1023-5809
dc.identifier.uri http://www.nonlin-processes-geophys.net/15/999/2008/npg-15-999-2008.pdf
dc.identifier.uri http://hdl.handle.net/1969.1/94158
dc.description.abstract Due to the combined effect of wind and rain, the importance of storm movement to surface flow has long been recognized, at scales ranging from headwater scales to large basins. This study presents the results of laboratory experiments designed to investigate the influence of moving rainfall storms on the dynamics of sediment transport by surface runoff. Experiments were carried out, using a rain simulator and a soil flume. The movement of rainfall was generated by moving the rain simulator at a constant speed in the upstream and downstream directions along the flume. The main objective of the study was to characterize, in laboratory conditions, the distribution of sediment grain-size transported by rainfall-induced overland flow and its temporal evolution. Grain-size distribution of the eroded material is governed by the capacity of flow that transports sediments. Granulometric curves were constructed using conventional hand sieving and a laser diffraction particle size analyser (material below 0.250 mm) for overland flow and sediment deliveries collected at the flume outlet. Surface slope was set at 2%, 7% and 14%. Rainstorms were moved with a constant speed, upslope and downslope, along the flume or were kept static. The results of laboratory experiments show that storm movement, affecting the spatial and temporal distribution of rainfall, has a marked influence on the grain-size characteristics of sediments transported by overland flow. The downstream-moving rainfall storms have higher stream power than do other storm types. en_US
dc.description.sponsorship This study was financed under research project POCI/AMB/58429/2004, by the Foundation for Science and Technology (FCT) of the Ministry of Science and Technology (MCT), approved under the Operational Programme (POCI) of Community Support Framework III (2000–2006) and was carried out in the Hydraulics, Water Resources and Environment Laboratory of the Department of Civil Engineering in the University of Coimbra’s Faculty of Sciences and Technology (FCTUC). en_US
dc.language.iso en en_US
dc.publisher Copernicus Publications on behalf of the European Geosciences Union and the American Geophysical Union en_US
dc.title Granulometric characterization of sediments transported by surface runoff generated by moving storms en_US
dc.type Article en_US
local.department Civil Engineering en_US
local.department Biological and Agricultural Engineering en_US

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