Assessment of sand trapped by coastal structures towards better management. El Masnou (Maresme, Catalunya)

• Autores: Marta Nuez, Belén Alonso Martínez, Ruth Durán Gallego, Gemma Ercilla Zárraga, Ferran Estrada Llacer, David Casas, Marcelino Farrán
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 10, 2008 (Ejemplar dedicado a: VII Congreso Geológico de España), págs. 511-514
• Idioma: español
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• Resumen

  • A monitoring of El Masnou has been performed during one year (June?06 to May?07) for the assessment of the sand trapped by the harbour towards a better management. It has been estimated a volume of sand accumulated at the harbour of 70,510 m3/ year. It shows similar characteristics than the sand of the adjacent beaches and it is accumulating close to the harbour at water depths shallower than 8- 9 m. Attaining a better management of these deposits it has been proposed some guidelines: (i) an annual dredge of about 70,000 m3 of sand donwdrift to the harbour in order to recover the sediment transport and guarantee the free access to the harbour; (ii) dredges at a maximum water depth of 8-9 m for guarantee the extraction of the sand intercepted; (iii) the consideration of the sand trapped by harbours as strategic sediment reservoirs; and (iv) the collapsing of the current trench wall landwards along the seaport before next activities for retarding the sand that reaches the entrance of seaport and therefore ensure the access to the seaport.