Les transformations contemporaines du lit de la riviere Couze Pavin en Auvergne

• Autorzy: Kazimierz Krzemień

Warianty tytułu

The Contemporary Transformation of the Couze de Pavin River Channel in Auvergne, France

• Języki publikacji: FR

Abstrakty

EN

The Couze de Pavin river channel system (43.7 km) was characterised as a result of field studies carried out during 1993-2000. The channel is situated in an area of marine climate and complex morphological origins. The Couze de Pavin river basin, raising from 374 to 1824 m a.s.l. and covering 272 km2, :s situated in the central part of the French Massif Central. It covers part of the Monts Dore massif and its eastern foreground. The geology contains Hercynian, Tertiary and Quaternary formations, mainly granitoides, metamorphic rocks, marl and limestone, as well as various lavas and pyroclastic formations (Peterlongo 1978). Four types of channels (A through D, Fig. 5) within the Couze de Pavin system have been identified. Each has a certain dominant function related to the whole channel. The Couze de Pavin channel structure corresponds to the main phases of the local morphological development. The maturing of the channel, i.e. levelling out, is typical for a number of reaches related to the main river valley breaks (Fig. 5). There are three main morphodynamic components in the river long-profile. The first one, up to the reach 2, features erosional dissection of the bedrock and transportation of relatively fine material into the broad valley bed. Here, the thicker material is accumulated and finer material transported further down the channel. The second component (reaches 3-5), features lateral migration of the channel and some transportation of fine material, principally suspended matter. The third component, beginning at reach 6, features erosional dissection of a Holocene-age lava stream and downstream transportation of material, mainly up to 20 cm in diameter. This is the component with a typical mountain-river modelling (erosion in it upper course and deposition / redeposition in the lower course). A conclusion might be that the component two is the most un-typical for the entire Couze de Pavin channel. There is a very weak relationship between the three components, what is related to water movement and transportation of dissolved and suspended material. (original abstract)

Słowa kluczowe

EN

Geology; Water container; Regional geography

PL

Geologia; Zbiorniki wodne; Geografia regionalna

• Czasopismo: Prace Geograficzne / Instytut Geografii i Gospodarki Przestrzennej Uniwersytetu Jagiellońskiego
• Rocznik: 2004
• Numer: z. 113 Les transformations du milieu montagnard-Carpates, Massif central et autres montagnes d'Europe
• Strony: 41--51

Twórcy

autor

Kazimierz Krzemień

• Jagiellonian University in Krakow, Poland

Bibliografia

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