In the Erlenbach torrent (Swiss Alps), the intensity of bed load transport is recorded indirectly and continuously by special sensors installed in the bottom of the channel. At the observation station in the Rio Cordon torrent (eastern Italian Alps) coarse bed load is separated from water and fine sediments, and the volume of both deposits is recorded. The Erlenbach shows a much more pronounced response to similar rainfall conditions. The geological conditions lead to a lower slope and channel stability in the Erlenbach stream than in the Rio Cordon. In both streams a relationship exists between the sediment load of a flood event and the corresponding runoff volume. A trend towards equal mobility is observed for higher discharges. Peak bed load transport may occur before or after the flood peak.
New results from sediment transport measurements in two Alpine torrents
D'AGOSTINO, VINCENZO;DALLA FONTANA, GIANCARLO;LENZI, MARIO ARISTIDE;
1998
Abstract
In the Erlenbach torrent (Swiss Alps), the intensity of bed load transport is recorded indirectly and continuously by special sensors installed in the bottom of the channel. At the observation station in the Rio Cordon torrent (eastern Italian Alps) coarse bed load is separated from water and fine sediments, and the volume of both deposits is recorded. The Erlenbach shows a much more pronounced response to similar rainfall conditions. The geological conditions lead to a lower slope and channel stability in the Erlenbach stream than in the Rio Cordon. In both streams a relationship exists between the sediment load of a flood event and the corresponding runoff volume. A trend towards equal mobility is observed for higher discharges. Peak bed load transport may occur before or after the flood peak.
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