Morphology of Subaqueous Dunes at the Mouth of the Dammed River São Francisco (Brazil)
| Autor: | Camille Traini, Diego D' Avila Beserra, Junia Kacenelenbogen Guimarães, José Maria Landim Dominguez, Karl Stattegger, Kerstin Schrottke, Andre Giskard Aquino da Silva, Helenice Vital |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Repositório Institucional da UFBA Universidade Federal da Bahia (UFBA) instacron:UFBA |
| ISSN: | 1551-5036 0749-0208 |
| DOI: | 10.2112/jcoastres-d-10-00195.1 |
| Popis: | Texto completo: acesso restrito. p. 1580-1590 Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-05-13T17:20:22Z No. of bitstreams: 1 Junia Kacenelenbogen.pdf: 2986461 bytes, checksum: 9f37d3749bf01c646b7261438b9c0fdf (MD5) Approved for entry into archive by Rodrigo Meirelles (rodrigomei@ufba.br) on 2015-10-09T18:51:00Z (GMT) No. of bitstreams: 1 Junia Kacenelenbogen.pdf: 2986461 bytes, checksum: 9f37d3749bf01c646b7261438b9c0fdf (MD5) Made available in DSpace on 2015-10-09T18:51:00Z (GMT). No. of bitstreams: 1 Junia Kacenelenbogen.pdf: 2986461 bytes, checksum: 9f37d3749bf01c646b7261438b9c0fdf (MD5) Previous issue date: 2012 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|