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Bedform variability and flow regime in a barrier-inlet system : the mesotidal Piedras mouth (Huelva, SW Spain)
Morales, J.A. (Universidad de Huelva. Departamento de Geología)
Delgado, I. (Universidad de Huelva. Departamento de Geología)
Gutiérrez Más, José Manuel (Universidad de Cádiz. Departamento de Ciencias de la Tierra)

Date: 2015
Abstract: Bedform fields from the Piedras River mouth (Huelva, SW Spain) have been studied using side-scan sonartechniques, combined with visual scuba-dives, and direct geometric measuring. The dominant flow regime hasbeen determined from the results in these tidal environments, where erosive processes dominate during ebb,transporting sand as a bedload towards the mouth and central sector of the tidal channel. The process is reversedduring tidal floods. During neap tides, larger bedforms maintain their geometry and position, whereas smallripples are re-oriented under different tidal conditions. Sand patches, dunes and ripples are interpreted as sedimentbypassing zones. Large forms indicate high energy flow, which can only migrate when flow velocity reachesthreshold values for the movement, with net sand transport towards open areas. Depositional features indicatelow, moderate, and high-energy conditions. Here, a depositional regime dominated by sediment accommodationis dominant, where sandy sediments are continuously remobilized, transported and re-deposited, even closer to theestuarine mouth. In inner zones finer particles, such as clay and silt, are transported by tides as suspended matterand deposited in protected inner areas. The final results are long narrow tidal flats, which alternate with sandyareas dominated by erosion.
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria. Creative Commons
Language: Anglès.
Document: article ; recerca ; publishedVersion
Subject: Estuary ; Ebb-tidal delta ; Bedforms ; Flow regime ; Sedimentary dynamics
Published in: Geologica acta, Vol. 13 Núm. 2 (June 2015) , p. 137-153, ISSN 1696-5728

Adreça alternativa: https://www.raco.cat/index.php/GeologicaActa/article/view/294810
DOI: 10.1344/GeologicaActa2015.13.2.5

17 p, 5.6 MB

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 Record created 2015-06-25, last modified 2018-07-26

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