SHORE NOURISHMENT AND THE ACTIVE ZONE: A TIME SCALE DEPENDENT VIEW

Marcel J.F. Stive, Huib J. De Vriend, Robert J. Nicholls, MIchele Capobianco

Abstract


First results towards the development of a predictive method of cross-shore spreading of beach and shore nourishments are described. Present interest in nourishment as an appropriate answer to long-term erosion motivates special attention for the time evolution of the cross-shore spreading. Hallermeier's (1981) annual shoreward boundary, D„ of the shoal zone is probably the most applied quantitative boundary for the seaward extent of nourishments. The extension of this concept to include time-dependency is a logical and necessary step to improve our understanding of nourishment performance. Moreover, insight into the precise cross-shore variation of the spreading process is lacking. By application of a detailed process-based, cross-shore morphodynamic model and some inductive assumptions the spreading process is studied as a function of time. The results give qualitative and quantitative indications of the spreading process, in particular concerning the evolution character of the spreading and the relation between the nourishment foot and closure depth.

Keywords


shore nourishment; active zone; time scale

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