Double-sandbar systems are common along sandy, wave-dominated coastlines. The evolution of a double-sandbar system is a complex process and is affected not only by the time-varying wave forcing but also by the local seabed morphology itself. The influences and relative importance of both wave condition and morphological variability on the evolution of a double-sandbar system still remain unclear and are investigated in this study using a well-established operational quasi-three-dimensional coastal evolution model. Results show that these two factors contribute to the final double-sandbar morphology in different ways. For energetic waves with high angles of wave incidence, waves determine the final sandbar morphology, regardless of the antecedent bathymetry. For moderate waves with small angles of wave incidence, however, the pronounced morphological variability (crescentic pattern of sandbars) will dominate the evolution, which remarkably enhances the existing morphological pattern regardless of the changed wave condition. A nondimensional index is proposed to quantitatively evaluate the relative importance of these two mechanisms. Further quantitative analysis reveals that the relative importance of wave condition and morphological variability depends on the alongshore current velocities over the bar crests. There also appears a critical value for these alongshore current velocities, below which morphological variability tends to be dominant and wave forcing is of less importance.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Influences of wave forcing and morphological variability on the evolution of a double-sandbar system


    Beteiligte:
    Gu, Zhenhua (Autor:in) / Zhang, Chi (Autor:in) / Zheng, Jinhai (Autor:in)


    Erscheinungsdatum :

    2016-08-01


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Deformation Process of Sandbar and Interaction between Vegetation and Sandbar in Meandering Channel of Shibetsu River

    Yasuda, Hiroyasu / Watanabe, Yasuharu / Kuratorium für Forschung im Küsteningenieurwesen (KFKI) | HENRY – Bundesanstalt für Wasserbau (BAW) | 2008

    Freier Zugriff

    A novel GIS-based approach for automated detection of nearshore sandbar morphological characteristics in optical satellite imagery

    Janušaitė, Rasa / Jukna, Laurynas / Jarmalavičius, Darius et al. | BASE | 2021

    Freier Zugriff

    Infragravity Energy and Its Implications in Nearshore Sediment Transport and Sandbar Dynamics

    Oltman-Shay, Joan / Hathaway, Kent | HENRY – Bundesanstalt für Wasserbau (BAW) | 1989

    Freier Zugriff