PURPOSE. To provide preliminary guidance for using the ELBLOCtm revetment unit on coastal revetments. BACKGROUND. A new, patented revetment unit, the ELBLOCtm (U. S. Patent No. 5,176,466, Revetment Unit and Method for Protecting Shoreline or Waterway), has been developed at the U.S. Army Engineer Waterways Experiment Station's (WES's) Coastal Engineering Research Center (CERC). The ELBLOC was developed to meet a need for a highly stable revetment unit with a simple, easily moldable design. The revetment unit will protect shoreline or waterway embankments from erosion caused by waves or currents. It is L-shaped, has a low center of gravity for stability, maximizes area covered per unit weight, and is designed to be placed in a fitted, interlocking matrix which has sufficient porosity to allow drainage and prevent excessive water pressure under the units (Figure 1). Model revetments formed from the units were tested in a WES laboratory wave flume using model units weighing approximately 0.3 lb with a specific gravity of 2.27. For the initial test, the model revetment was placed on a mound of crushed stone with a 1V:1.33H (37-deg) slope. The placement pattern is shown in Figure 2. Chain was placed along the edge of the revetment to simulate continuity of interlocking and prevent flume wall effects. Tests were conducted using short period waves, partly to simulate limited fetch conditions and partly because previous tests on other revetment units had indicated lower stability with shorter wave periods (McCartney and Ahrens 1975).


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    Title :

    ELBLOCTM Revetment Unit – Preliminary Guidance


    Publication date :

    1995


    Size :

    4 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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