Hydrological and sediment trends between 1982 and 2011 in the long term research basin Valle della Gallina

TitleHydrological and sediment trends between 1982 and 2011 in the long term research basin Valle della Gallina
Publication TypeJournal Article
Year of Publication2013
AuthorsF M, M A, S C
JournalDie Bodenkultur
Volume64
Start Page61
Type of ArticleHydrological and sediment trends
Keywordscoarse sediment transport, Runoff decrease, water balance
Abstract

Sediment and hydrological monitoring were conducted in a small basin on the western Italian Alps along an experi- mental reach of 120 m located upstream of a sediment trap. A meteorological station located at the ridgeline and a monitoring station at the outlet have been recording hydrological and sediment flows since 1982. The mean sub- basin discharge is 0.02 m 3 s-1 (maximum: 6,4 m 3 s-1, 1996) and flash floods occur with several peak flows higher than 1 m 3 s-1. Sediment transport is mainly bed load with sediment discharges ranging between zero and 74 m3. Surface runoff and sediment transport have been decreasing since the year 2000, commensurate with reduced annual rainfall and increased soil water retention attributed to forest revegetation across the basin. There has been no land use or anthropogenic disturbance during the period of sediment monitoring.