The estimation of scour depth at bridge piers is an important task in hydraulic engineering. The physical processes governing bridge scour range are highly complicated and several open questions still await clarification. This is reflected by the multitude of available approaches which yield significant differences in estimated scour depths up to several meters. Most of the existing approaches were derived on the basis of scale model experiments carried out in the laboratory with simplified boundary conditions. However, for fine sized prototype sediments such as sand it is often not possible to downscale the sediment due to associated changes in physical and chemical properties once the scaled sediment is in the silt and clay range. The objective of this thesis is to investigate the possibility to substitute natural sediment by artificial granulate. For this purpose, scour experiments were carried out in an 8.0 m long, 0.3 m wide and 0.6 m deep horizontal flume. A single cylindrical pier model with diameter D = 0.03 m was embedded vertically in the flume centerline. The scour experiments were carried out with natural and artificial sediments. As a result, two points can finally be summarized. First, the material density has significant influence on the time to reach the equilibrium scour depth, but not on the maximum scour depth. Second, if artificial granulate with a lower density is used in a bridge pier model instead of natural sediment, the grain size should be similar to get similar scour depth.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Effect of sediment density in bridge pier scour experiments


    Weitere Titelangaben:

    Einfluss der Sedimentdichte in Pfeilerkolk Experimenten


    Beteiligte:
    Meyering, Henrich (Autor:in) / Universitätsbibliothek Braunschweig (Gastgebende Institution) / Dittrich, Andreas (Akademische:r Betreuer:in)

    Erscheinungsdatum :

    2012



    Medientyp :

    Sonstige


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    DDC:    627





    Live-Bed Local Pier Scour Experiments

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

    Freier Zugriff

    Impacts of Debris on Bridge Pier Scour

    Lagasse, Peter F. / Zevenbergen, Lyle W. / Clopper, Paul E. | HENRY – Bundesanstalt für Wasserbau (BAW) | 2010

    Freier Zugriff

    Effects of Debris on Bridge Pier Scour

    Zevenbergen, Lyle W. / Lagasse, Peter F. / Clopper, Paul E. et al. | HENRY – Bundesanstalt für Wasserbau (BAW) | 2006

    Freier Zugriff