A two-dimensional numerical model is presented for calculating dune and beach erosion produced by storm waves and water levels. The model is empirically based and was first developed from a large data set of net cross-shore sand transport rates and geomorphic change observed in large wave tanks, then verified using high-quality field data. The model is aimed to reproduce macroscale features of the beach profile, with focus on the formation and movement of longshore bars. The ultimate goal of the modeling effort is prediction of storm-induced beach erosion and post-storm recovery. Bars are simulated satisfactorily, but berm processes are less well reproduced, due in part to a lack of data for defining accretionary wave and profile processes. A new criterion is developed for predicting erosion and accretion, and the model uses this criterion to calculate net sand transport rates in four regions of the nearshore extending from deep water to the limit of wave runup. Wave height and setup across the profile are calculated to obtain the net cross-shore sand transport rate. The model is driven by engineering data, with main inputs of time series of wave height and period in deep water, time series of water level, median beach grain size, and initial profile shape. Comprehensive-sensitivity testing is performed, and example applications are made to evaluate the response of the profile to the presence of a vertical seawall and the behavior of different beach fill cross sections in adjustment to normal and storm wave action.


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    Title :

    SBEACH: Numerical Model for Simulating Storm-Induced Beach Change. Report 1, Emperical Foundation and Model Development


    Contributors:

    Published in:

    Technical Report ; CERC-89-9 rept.3


    Publication date :

    1989


    Size :

    10765153


    Type of media :

    Report


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :


    SBEACH: Numerical Model for Simulating Storm-Induced Beach Change. Report 2, Numerical Formulation and Model Tests

    Larson, Magnus / Kraus, Nicholas C. / Byrnes, Mark R. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1990

    Free access

    SBEACH: Numerical Model for Simulating Storm-Induced Beach Change. Report 5: Representation of nonerodible (hard) Bottoms

    Larson, Magnus / Kraus, Nicholas C. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1998

    Free access

    Emperical Debris Analysis

    Cruickshank, D. R. / American Astronautical Society | British Library Conference Proceedings | 1995



    Shoreline Change and Storm-Induced Beach Erosion Modeling: A collection of Seven Papers

    Kraus, Nicholas C. | HENRY – Federal Waterways Engineering and Research Institute (BAW) | 1990

    Free access