ERDC/TN RSM-18-4 January 2018 Approved for public release; distribution is unlimited. Regional Sediment Management: Integrated Solutions for Sediment Related Challenges User’s Guide for the Sediment Mobility Tool Web Application by Brian C. McFall and Katherine E. Brutsché PURPOSE: This U.S. Army Corps of Engineers (USACE) Regional Sediment Management Technical Note (RSM-TN) describes how to use the interactive Sediment Mobility Tool (SMT) web application to quickly assess prospective nearshore placement sites of dredged sediment for scoping-level engineering studies. INTRODUCTION: As part of regional sediment management, dredged sediment is commonly placed in the nearshore for beneficial use. A simple web application has been created that can rapidly produce a preliminary assessment of sediment mobility at prospective nearshore placement sites. This web application is ideal for preliminary or reconnaissance engineering studies to evaluate the potential mobility of sediment grain sizes and volumes placed in the nearshore and for comparison between multiple placement sites. This user’s guide is intended to describe the function and steps to use the web application. Currently, the web application can be found on the Navigation Portal (http://navigation.usace.army.mil) under the Sediment & Ecosystem Management tab. Additional details about the sediment mobility calculations are detailed in the Coastal and Hydraulics Engineering Technical Note (CHETN) Evaluating Sediment Mobility for Siting Nearshore Berms by McFall et al. (2016), and the depth of closure calculations are detailed in the CHETN Calculating Depth of Closure Using WIS Hindcast Data by Brutsché et al. (2016). WEB APPLICATION INPUT: The web application is intended to be an intuitive interface to apply the SMT and to easily view a calculated depth of closure for the entire U.S. coastline. A screenshot of the web application is shown in Figure 1. To evaluate a potential nearshore placement site, the SMT transforms offshore wave hindcast data from the nearest Wave Information Study station (WIS) (Hubertz 1992) to the nearshore placement site and calculates the depth of closure, frequency with which placed sediment will be mobilized, cross-shore sediment migration direction, and axis of wave-dominated sediment transport. The SMT web application calculates these items by prompting the user with the following steps: Step 1. Zoom-in to the nearshore study site. Step 2. Draw the approximate orientation of the shoreline in front of the nearshore study site as shown in Figure 2. The shoreline should be a single line segment, and the second point has to be double-clicked by the user.