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The U.S. Army Corps of Engineers, Baltimore District (NAB), is currently engaged in the Dyke Marsh Project for the National Park Service. Dyke Marsh is located along the Potomac River south of Alexandria, VA. The U.S. Army Engineer Research and Development, Coastal and Hydraulics Laboratory, conducted a numerical modeling study to compute differences in hydrodynamic conditions (water surface elevations, depth-averaged water velocities, and wave heights, periods, and directions) between existing conditions and seven alternative with-project conditions for Dyke Marsh. Modeling results suggested that several of the alternative withproject condition designs were viable in terms of the NAB goals to provide protection to the marsh from damaging waves and currents. All the designs decreased wave heights in the shadow zones of the structures, and none significantly altered water levels. The shorter-length project designs provided reasonable levels of protection to the marsh while not significantly increasing water velocities on the opposite (eastern) shoreline of the Potomac River. Detailed model results from each of the alternative with-project condition designs are presented herein. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/CHL TR-18-15 iii

CSTORM-MS storm surge and wave modeling comparison for proposed Dyke Marsh promontory restoration