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No Abstract Avaliable

No Abstract Avaliable

No Abstract Avaliable

Long-term data on profile response, sediment distribution and wave information have been collected and analyzed for the Indialantic/Melbourne Beach beach nourishment project in order to properly assess the history of fill volume retention and fill grain size stability through time. A fill volume of 195,060 m super(3) was placed in the winter of 1980 along a 3.4 km section of beach in Brevard County, Florida, located 43 km south of Cape Canaveral. The borrow material was from an upland source and was placed by truck haul on the design profile. The longer-term monitoring of the project from five months to seven years after fill placement consisted of near-quarterly profiles, with additional profiles bracketing significant storm events. A seasonality of summer accretion and winter erosion was observed during this period. Storm frequency was the controlling factor in rate of fill removed from the foreshore. As a result of each storm, coarser fill material was exposed and reintroduced along the fill placement zone. Foreshore sediment sample composites showed a seasonal trend along with coarsening after each storm. The systematic monitoring of this beach nourishment project over the long-term provided insight into initial rapid readjustment of the fill template, seasonal and storm variability in fill profile and sediment adjustment, project response and protection provided to storm conditions, and the temporal longevity of fill performance. This type of data is necessary to improve design concepts of fill placement, design berm templates, borrow area suitability and temporal prediction of project lifespan.

Mining of ebb shoals has become more prevalent in recent years due to limited sources of beach quality sand available for beach nourishment projects. This paper examines eight ebb shoal mining projects completed since 1981 in an attempt to examine this relatively new practice of removing material from an inlet ebb shoal. A brief description of each inlet's history, morphology, and processes is given in an Appendix for background information and available information on the ebb shoal mining events at each inlet is presented in this paper. The eight projects presented range in size from 170,000 m (super 3) removed from the ebb shoal at Boca Raton Inlet (Florida) to 6,235,000 m (super 3) removed from the ebb shoal at Great Egg Harbor Inlet (New Jersey). The recent completion of many of these projects and lack of systematic monitoring has resulted in limited monitoring data to assess shoal mining impacts on the inlet system. With this in mind, impacts of ebb shoal mining inferred from the data and the level of monitoring at each project site are discussed. From this study, it has been determined that most ebb shoals are mined on the outer "passive" portion of the shoal feature. Ebb shoal sand was found to be compatible with the native beach material, indicating that the ebb shoal acts as a "sand bridge" between the updrift and downdrift beaches. The rate of recovery of the mined area appears to be a function of the degree to which the system equilibrium is perturbed, sand availability (longshore transport rate), storm frequency, and the depth of the mined area. Estimates of borrow area recovery were often overpredicted, probably due to poor longshore transport estimates. Further analysis is needed to determine ebb shoal mining impacts to navigation, inlet adjacent shoreline, ebb shoal equilibrium, and reusability of borrow area infill material. This paper is an attempt to evaluate the state-of-the-art in the practice of removing material from inlet ebb shoals and monitoring of these projects. A suggested monitoring plan for future ebb shoal mining projects is also presented.