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The Houston Ship Channel is one of the busiest deep-draft navigation channels in the United States and must be able to accommodate larger vessel dimensions over time. The U.S. Army Engineer District, Galveston (SWG), requested the U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory, perform hydrodynamic and sediment modeling of proposed modifications along the Houston Ship Channel from its connection to the Gulf of Mexico to the Port of Houston. The modeling results are necessary to provide data for salinity and sediment transport analysis as well as ship simulation studies. SWG provided a project alternative that includes channel widening, deepening, and bend easing. The model is run for present year zero (2029) and future year 50 (2079) with and without project. The model shows that the salinity does not vary greatly with project. Changes to salinity are 2 parts per thousand or less. The tidal prism increases by less than 2% when the project is included, and the tidal amplitudes increase by no more than 0.01 meter. The residual velocity vectors do vary in and around areas where project modifications are made — along the Houston Ship Channel, Bayport Channel, and Barbours Cut Channel. The model also indicates an increase in the shoaling along the ship channel when compared to the without project results, the largest increases being in the Bayport channel and flare. 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-19-12 iii

Houston Ship Channel Expansion Channel Improvement Project (ECIP) numerical modeling report