Abstract
This paper studies the evolution of the Ara river from 1929 till now in a bench between Boltaña and Aínsa. Methods are based mainly infield work and in the use of aereal photographs corresponding to 1929, 1946, 1956, 1981, 1984 and 1988. The authors have elaborated a geomorphological cartography that allows us to establish the changes in channel morphology: progressive enlargement ofthe fluvíal bed; predominance of areas without plant cover until 1956; development of plant cover from 1956 unta now; subdivision of the main bars in small secondary bars owing to a increase of the number of channels; increasing human activities from 1974 (building of the Mediano reservoir and channelization of the river by means of lateral dykes).
Highlights
1929 hasta la actualidad en el tramo comprendido entre Boltaña y Aínsa
SUM.MARY. -This paper studies the evolution of the Ara river from 1929 tUl in a bench between Boltaña and Aínsa
The authors have elaborated a geomorphological cartography that allows us to establish the changes in channel morphology: progressive enlargement ojthejluvíal bed; predominance of areas without plant cover until 1956; development of plant cover from 1956 unta ; subdivision of the main bars in small secondary bars owing to a increase of the number of channels; increasing human activities from 1974
Summary
RESUMEN. -Este trabajo tiene como objetivo el estudio evolutivo del rio Ara desde. 1929 hasta la actualidad en el tramo comprendido entre Boltaña y Aínsa. -Este trabajo tiene como objetivo el estudio evolutivo del rio Ara desde. 1929 hasta la actualidad en el tramo comprendido entre Boltaña y Aínsa. Con todo ello se ha elaborado una cartografía que nos ha permitido establecer una serie de cambios en la dinámica fluvial: ampliación progresiva del lecho del rio; predominio de sedimentos funcionales y sin vegetación hasta 1956; desarrollo de la colonización vegetal desde. 1956 hasta hoy; subdivisión de las barras principales en pequeñas barras secun.clarins debido al aumento del número de canales; acelerada intervención humana a partir de. -This paper studies the evolution of the Ara river from 1929 tUl in a bench between Boltaña and Aínsa. Palabras clave: Morfología fluvial, barras, carga de fondo, río de gravas, río Ara, Pirineo Central.
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