Natural versus anthropic causes in variations of sand export from river basins: an example from the Guadiana River Mouth (Southwestern Iberia)

• Autorzy: Dias J. M. A. , Gonzales R. , Ferreira Ó.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

Guadiana River; sediment transport; estuarine sand bodies; floods; NAO; anthropic influence

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Polish Geological Institute Special Papers
• Rocznik: 2004
• Tom: Vol. 11
• Strony: 95--102
• Opis fizyczny: Bibliogr. 39 poz., rys., wykr.

Twórcy

autor

Dias J. M. A.

autor

Gonzales R.

• CIACOMAR/CIMA, Universidade do Algarve, Avenida 16 de Junho s/n, 8700-311 Olhão, Portugal

autor

Ferreira Ó.

• FCMA/CIMA, Universidade do Algarve, Campus de Gambelas, 8000-117 Faro, Portugal

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