SciELO - Scientific Electronic Library Online

vol.28 número2Diagramas de manejo de densidad para renovales de roble, raulí y coigüe en Chile índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


Bosque (Valdivia)

versión On-line ISSN 0717-9200


ANDREOLI, Andrea; CARLIG, Giovanni; COMITI, Francesco  y  IROUME, Andrés. Study on large woody debris in a stream from the Andes Mountains: functionality and importance. Bosque (Valdivia) [online]. 2007, vol.28, n.2, pp.83-96. ISSN 0717-9200.

The study analyzed amounts, characteristics and morphological impact of large woody debris (LWD) in Tres Arroyos torrent of the Chilean Southern Andes draining an old-growth forested basin. All woody debris pieces greater than 10 cm in diameter and 1 m in length were surveyed along a 1.5 km-long stream section presenting a general step-pool/cascade morphology. The total amount of large woody debris within the fluvial corridor was on average 1,500 m3/ha, very high value comparable only to data from old-growth forested basins in the Pacific Northwest of North America. Around two thirds of LWD volume were found in accumulations while half of the LWD elements were located on the active floodplain. As much as 83% of the LWD pieces showed signs of in-stream transport, 13% were directly associated to natural tree falls, and the remaining to landslides and bank erosion. Different types of log-jams were observed, some heavily altering channel morphology (log-steps and valley jams), others just lining the channel edges (bankfull bench jams). The percentage of log-steps over the total number of steps is around 22%, whereas the elevation loss due to LWD (log-steps and valley jams) was 27% the total potential energy. Finally, 2,000 m3 of sediments were estimated to be stored in the main channel behind LWD structures, corresponding to approximately 150% of the annual basin sediment yield.

Palabras clave : large woody debris (LWD); old-growth forested basin; channel morphology; valley jams; stored sediments.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons