Formation, Expansion And Restoration Of A
Sedimentation Fan: The Case Of The Arroyo Del
Partido Stream (Spain)
Author(s)
J. A. Mintegui Aguirre, J. C. Robredo Sánchez, L. Mao
& M. A. Lenzi
Abstract
The Arroyo del Partido is a small stream flowing into the Doñana National Park
marsh. In its lower part, the stream used to flow in a wide, low-gradient area,
where the channel was highly dynamic with frequent avulsions. As a result of a
channel rectification, the subsequent floods heavily eroded the artificial banks
and created over time a depositional fan within the Doñana marsh. The bedload
dynamic at the annual scale was estimated from the expansion of the
sedimentation fan, assessed from aerial photographs analysis and repetitive
topographic surveys. The bedload transport ranged from 3.7×106 to 2.1×103 m3
per year, depending on the sequences of occurring floods and on the changing
geometrical conditions of the main channel. The progressive erosion of the
artificial banks led to self-established cross-sections and slope geometry, which
reduced shear stress acting on the bed and favoured sediment deposition on the
floodplains, reducing overtime the expansion of the sedimentation fan. This
evidence has been used to plan a restoration strategy for the fan and floodplains,
aimed to mitigate the effect of the embankment and to improve the overall
functionality of the stream. As a result of the restoration, an artificial levee was
eliminated and a wide floodplain area was recreated as a free-meandering
floodplain.
Keywords: channel rectification, sedimentation fan, sediment transport, aerial
photographs, topographical surveys, channel restoration.
Keywords
channel rectification, sedimentation fan, sediment transport, aerial
photographs, topographical surveys, channel restoration
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