A heretofore overlooked mechanism is described for the removal of sediment in the vicinity of a structure, such as a bridge pier, located in erodible sediment and subjected to water flow. The strength of this mechanism depends on, among other things, the ratio of structure width to sediment grain size, b/D50. The mechanism results from the pressure gradient field imposed on the bed by the mean flow around the structure. The large pressure gradients created by the structure are confined to a relatively narrow region near the structure. The forces due to the pressure gradients acting on the sediment grains near the structure decrease with increasing values of b/D50. This mechanism helps explain the functional dependence of equilibrium local scour depth on b/D50 observed in both laboratory and field tests. It also explains why, in general, physical model local scour tests tend to overpredict prototype scour depths.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Overlooked Local Sediment Scour Mechanism


    Weitere Titelangaben:

    Transportation Research Record


    Beteiligte:


    Erscheinungsdatum :

    2004-01-01




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Effect of Suspended Fine Sediment on Local Scour

    Sheppard, Max D. | HENRY – Bundesanstalt für Wasserbau (BAW) | 2002

    Freier Zugriff

    Sediment Scour at Piers with Complex Geometries

    Sheppard, Max D. / Glasser, Tom L. | HENRY – Bundesanstalt für Wasserbau (BAW) | 2004

    Freier Zugriff


    Live-Bed Local Pier Scour Experiments

    Sheppard, Max D. / Miller, William | HENRY – Bundesanstalt für Wasserbau (BAW) | 2004

    Freier Zugriff