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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Evidence of transient scour and fill
Evidence of transient scour and fill
Author : CAPAPE, S.(1), MARTIN-VIDE, J.P.(1)
ABSTRACT
Transient scour and fill refers to the general scour and fill in a riverbed due to the passage of a flood. It was given much
attention in the times of Leopold and Maddock (1953) from records of outstanding case studies. Data from the large sandbed
Pilcomayo River are presented. The maximum sediment concentration in the database is greater than 60 kg/m3,
mostly wash load. The water surface rises and falls during a flood event, whereas the streambed evolves in reverse, in a
way that the streambed scour accounts for 36% of the change in flow area and renders the analogy to an accordion. The
database reveals scouring up to 5 m from the initial streambed elevation. The analysis follows in the footsteps of Leopold
and Maddock (1953), who stressed the role of the sediment load in the transient scour and fill. The velocity displays large
hysteresis loops inexplicable by the unsteady flow over a fixed bed. Instead, it is suggested that these distinct loops stem
from the high sediment load (bed material and probably also wash load) that enhances the transient scour and fill.
File Size : 458,376 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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