Morphology of Subaqueous Dunes at the Mouth of the Dammed River Sao Francisco (Brazil).

Traini, Camille, Schrottke, Kerstin, Stattegger, Karl, Landim Dominguez, Jose Maria, Guimaraes, Junia Kacenelenbogen, Vital, Helenice, Beserra, Diego d'Avila and Aquino da Silva, Andre Giskard (2012) Morphology of Subaqueous Dunes at the Mouth of the Dammed River Sao Francisco (Brazil). Journal of Coastal Research, 28 (6). pp. 1580-1590. DOI 10.2112/jcoastres-d-10-00195.1.

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Abstract

Economic development of the São Francisco River basin has increased by building seven river dams since the 1950s. Subsequently, strong coastal erosion reaching maximum rates of 98.6 m/year has been recorded at the river mouth, also leading to the destruction of a coastal village. This work combines discharge data with new sediment and hydro-acoustic records, collected in January 2009, to verify the impact of river damming on processes, controlling coastline evolution. Data analysis is focused on discharge evolution, morphology and sediment composition of subaqueous dunes as well as on the impact by tidal currents. Discharge has been strongly regulated since 1986, when the last river dam was implemented. Again, bedform morphology seems to be not affected neither by reduced river-discharge nor by reduced sediment supply. However, migration rates of these dunes, as calculated, are lower due to decreased discharge. At the same time, tidal impact is strengthened at the lowermost part of the river. From this we assume, that the replenishment of sediment at the coast near the river-mouth might be time-delayed, which could support coastal erosion.

Document Type: Article
Keywords: ADCP grain-size parametric sediment echo-sounder River-discharge side-scan sonar
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > The Future Ocean - Cluster of Excellence > FO-R06
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.2112/jcoastres-d-10-00195.1
ISSN: 0749-0208
Projects: Future Ocean
Date Deposited: 14 May 2014 09:16
Last Modified: 23 Sep 2019 19:13
URI: http://oceanrep.geomar.de/id/eprint/24273

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