Large-scale itboratory tests of the initial fate of material disposed in open disposal operations used a model split-hull water are required for the following activities: barge and a multiple bin disposal vessel. The tests were conducted in water depths up to 6 ft t Address environmental concerns related with the maximum horizontal dimensions of to the disposal of dredged material the test facility being 32 ft by 41 ft. Both sta-" Provide input for long-term sediment tionary and moving disposal operations were transport models used in disposal site simulated with materials ranging from essenmanagement tially pure clay to fine coal. Data collected RESEARCH: Dredged material disposal consisted of bottom disposition depths, susmodels were developed under the Dredged pended sediment samples, and video taping Material Research Program (DMRP), 1973-through side-viewing windows. Results from 1978. Under the Dredging Research Program the individual testsand an analysis of those re-(DRP), additional developments to the earlier sults are presented in the report. models have resulted in the numerical dis-AVAILABILITY OF REPORT: The report posal model called STFATE (Qort-Term is available through the Interlibrary Loan Ser-FATE) for application to split-hull barge and vice from the US Army Engineer Waterways hopper dredge disposal operations. These de-Experiment Station (WES) Library, telephone velopments have been guided by both field number (601) 634-2355. National Technical data and data from large-scale laboratory Information Service (NTIS) report numbers tests. In addition to guiding model developments, data from the laboratory tests are being may be requested from WES Librarians, used in model validation efforts. ro purchase a copy of the report, call NTIS at (703) 487-4780. May 1993 Please ,'eproduce this page locally, as needed.
As part of the Comprehensive Everglades Restoration Project (CERP), the Jacksonville District of the U.S. Army Corps of Engineers is designing an impoundment embankment cross-section. The structure is intended to comprise the perimeter of a water supply basin. The conceptual cross-sections feature interior step and berm embankment faces to armor the containment levee, reduce wave overtopping to acceptable levels, and control reflected wave energy. The goal of the study was to develop engineering guidance for optimizing the structure crosssection to provide the minimum structure that met both wave overtopping and wave pressure design criteria. A small-scale physical model study of waves impacting and overtopping the embankment was conducted. A parallel effort was also completed using the Cornell Breaking Waves and Structure (COBRAS) numerical model based on the Reynolds-averaged Navier Stokes (RANS) equations. The COBRAS model was shown to predict both wave overtopping and hydraulic pressures on the embankment well. An empirical equation was developed to predict wave overtopping as a function of structure configuration and wave and water level conditions. The study concluded that the stepped structure with no berm was optimal at reducing overtopping. The structure with continuous steps inhibits turtle egress from the basin. Therefore, guidance is provided for smooth slopes as well as for slopes employing separated blocks for overtopping reduction. The maximum pressures were shown to vary unpredictably with increasing berm width and depth. The maximum pressure was generally higher for the stepped structure without a berm than for the sections with berms. The highest pressures on the embankment appeared to be more a function of the details of the breaking wave interacting with the structure face than the structure geometry.
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