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Geomorphology and sediment transport in a very low relief catchment: R. Quequén Grande, Argentina



The aim of this work was to identify the geomorphological units\ud within the drainage network of the Rio Quequén Grande low relief basin,\ud situated in the southeast section of the province of Buenos Aires, and to\ud quantify the present sediment transport rate. For this purpose field surveys and\ud satellite images were analysed. The former included measurement of bed\ud material grain size and channel hydraulic geometry, in order to set up a bed\ud and a suspended load measurement programme. Six main geomorphic units\ud were identified: Ranges, Perirange Aeolian Hillocks, Hillocks with Lagoons,\ud Relic Hills, a Poor Drainage Alluvial Plain and an Alluvial Plain. Bed load\ud discharge and suspended sediment concentration measured during a bankfull\ud flood are very low, given the relatively high stream power of 287 W m-1. The\ud measured bed load discharge was three to five orders of magnitude lower than\ud six applied bed load equations, presumably due to low sediment availability

Topics: Argentinian Pampas, geomorphology, sediment transport
Publisher: IAHS
Year: 2005
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