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Flood events in many river basins with highly variable discharge values remove accumulated sediments from the riverbed and estuaries. These sediments are exported to the shelf and the adjacent coastlines. Data for rainfall and river discharge for the Guadiana River basin in southwestern Iberia show a strong link with North Atlantic Oscillation (NAO) index patterns. A negative NAO index usually results in more rainfall, and subsequent flooding in the river basin during winter months. During the second half of the 20th century, the flow regime of the Guadiana River and its tributaries have been increasingly constrained by the construction of dams. The consequences were a reduction of coarse-grained sediment export from the upper river basin to the estuary, and a reduction in the number and type of floods.
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Tom
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95--102
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Bibliogr. 39 poz., rys., wykr.
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autor
autor
- CIACOMAR/CIMA, Universidade do Algarve, Avenida 16 de Junho s/n, 8700-311 Olhão, Portugal
autor
- FCMA/CIMA, Universidade do Algarve, Campus de Gambelas, 8000-117 Faro, Portugal
Bibliografia
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- 25. LOUREIRO J.J.M., NUNES M.N., MACHADO M., 1986 — Bacia hidrográfica do rio Guadiana. Monografías Hidrológicas dos Principais Cursos de Água de Portugal Continental, M.P.A.T., S.E.A.R.N. Direcção Geral dos Recursos e Aproveitamentos Hidráulicos: 341-407.
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- 27. MORALES J.A., 1993 — Sedimentologia del estuario del Guadiana (S.W. España-Portugal). Ph.D. Thesis, Sevilla, Spain, University of Sevilla.
- 28. MORALES J.A., 1997 — Evolution and facies architecture of the mesotidal Guadiana River delta (S.W. Spain-Portugal). Marine Geology, 138: 127-148.
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- 31. RIMBU N., BORONEANT C., BUTA C., DIMA M., 2002 — Decadal variability of the Danube River flow in the lower basin and its relation with the North Atlantic Oscillation. Intern. J. Climatology, 22, 10: 1169-1179.
- 32. ROCHA C., GALVÃO H., BARBOSA A., 2002 — Role of transient silicon limitation in the development of cyanobacteria blooms in the Guadiana estuary, south-western Iberia. Marine Ecology Progress Series, 228: 35-45.
- 33. ROGERS J.C., 1997 — North Atlantic storm track variability and its association to the North Atlantic Oscillation and climate variability of Northern Europe. J. Climate, 10, 7: 1635-1647.
- 34. STANLEY D.J.,NIR Y., GALILIE., 1998 — Clay mineral distribution on interpret Nile cell provenance and dispersal: III. Offshore margin between Nile delta and Northern Israel. J. Coastal Research, 14, 1: 196-217.
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- 37. VILES H.A., GOUDIE A.S., 2003 — Interannual, decadal and multidecadal scale climatic variability and geomorphology. Earth-Science Reviews, 61, 1/2: 105-131.
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- 39. WEINHOLTZ de BIVAR M., 1978 — Rio Guadiana, Elementos para o estudo da evolução da sua desembocadura. Direcção Geral de Portos.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUS6-0022-0012