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Berm Creation

    Description
    Dredged material may be used for creating berms or embankments to modify shoreline wave climate and thus improve beach stability. The berm may also be designed to alter wave direction and modify the rate or direction of local sediment transport. Generally the berm is aligned roughly parallel to the beach, but the optimum alignment at a specific site will be determined by the direction of the most destructive wave climate.

    The formation of berms may provide a particularly attractive use for a wide range of dredged material. Because the berm is generally a submerged formation, most or all of the formation usually can be created by the bottom discharge of dredged material from hoppers. Berms may gradually erode and be dispersed, but the dispersed material will probably benefit the local coastal regime, either through beach feeding or by increasing foreshore levels.

    Modification of the wave climate by berms may also improve recreational opportunities for surfing, swimming, sailing, and other activities. Care must be taken in placement of the berm to avoid interference with other users such as fisheries, ports, harbors, outfalls, and intakes.

    Recommended Sediment Types

    • Rock
    • Gravel and sand
    • Consolidated clay
    • Mixture

    References

    • McLellan, T.N., Kraus, N.C., and Burke, C.E. (1990.) "Interim Design for Nearshore Berm Construction," Dredging Research Technical Notes (DRP-5-02), U. S. Army Engineer Waterways Experiment Station, Vicksburg, MS.

    • Smith, E.R., and Gailani, J.Z. (2005.) "Nearshore Placed Mound Physical Model Experiment," DOER Technical Notes Collection (ERDC TN-DOER-D3), U.S. Army Engineer Research and Development Center, Vicksburg, MS.

    • U.S. Army Engineer Waterways Experiment Station (1988.) "Considerations for Planning and Managing Nearshore Placement of Mixed Dredged Sediments," Technical Note DOER-N3, Vicksburg, MS.

    Case Studies

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