ADH = Fast and Stable 2D Finite Element Model

ADH (ADaptive Hydraulics) is the modern, multi-dimensional hydraulic modeling program in development by the Coastal and Hydraulics Laboratory (CHL) of the Corps' Engineering and Research Development Center (ERDC). The model was publicly released in September 2007 but has been used by the Rock Island District (MVR) since January 2006. MVR and other Corps Districts have been successful using ADH for many 2D applications and have found the shallow-water (2-D) module of ADH to be very fast and stable compared to previously used 2D hydraulic programs (RMA2 and HiVel2D). As beta users of the software, MVR had the opportunity to provide feedback to ERDC to help shape the program towards user needs and has assisted in technology transfer to other Corps districts throughout the region by hosting training workshops. The Navigation and Ecosystem Restoration Program (NESP) is the implementation program for the recommendations contained within the Chief's Report for the Upper Mississippi River and Illinois Waterway System Navigation Study. This presentation will discuss the advantages of ADH and how it was used for the NESP Lock and Dam 22 project. A range of modeling applications were addressed, including: design of approach channel improvements, guardwall porting design for a newly proposed guardwall, design of a fish passage structure through the existing spillway, velocity field calculations during different stages of construction, and the overall effects of sedimentation due to the proposed work. Ongoing modeling activities are evaluating the effects of multiple projects constructed within a river reach to support objectives for both navigation and ecosystem restoration.