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Discussion papers
https://doi.org/10.5194/nhess-2020-72
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-72
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 10 Mar 2020

Submitted as: research article | 10 Mar 2020

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This preprint is currently under review for the journal NHESS.

What controls the coarse sediment yield to a Mediterranean delta The case of the Llobregat river (NE Iberian Peninsula)

Juan P. Martín-Vide, Arnau Prats-Puntí, and Carles Ferrer-Boix Juan P. Martín-Vide et al.
  • Technical University of Catalonia Jordi Girona 1-3, D1, 08034 Barcelona, Spain

Abstract. The human pressure upon an alluvial river in the Mediterranean region has changed its riverine and deltaic landscapes. The river has been channelized in the last 50 years while the delta is being retreating for more than a century. The paper concentrates on the fluvial component, trying to connect it to the delta evolution. It develops a method to compute the actual bed load transport with real data. The paper compares the computation with measurements and bulk volumes of trapped material at a deep river mouth. Sediment availability in the last 30 km of the river channel is deemed responsible for the decrease in the sediment yield to the delta. Moreover, reforestation is deemed responsible for a baseline delta retreat. The sediment trapping efficiency of dams is less important than the flow regulation by dams, in the annual sediment yield. Therefore, it is more effective a step back from channelisation than to pass sediment at dams, to provide sand to the beaches.

Juan P. Martín-Vide et al.

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Juan P. Martín-Vide et al.

Juan P. Martín-Vide et al.

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Short summary
Human pressure upon an alluvial Mediterranean river has changed its riverine and deltaic landscape. We focus on a river, channelized in the last 50 years, and we try to link its evolution to a delta which is retreating for more than a century. Sediment availability in the last 30 km of the river channel is deemed responsible for the decrease in the sediment yield to the delta. Sediment supply reduction to the coast jeopardizes the future of the delta.
Human pressure upon an alluvial Mediterranean river has changed its riverine and deltaic...
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