Modeling Transport of Disposed Dredged Material from Placement Sites in Grays Harbor, WA

The US Army Corps of Engineers Seattle District (NWS) is addressing shortto midterm dredge material management strategies for the Federal Navigation Project at Grays Harbor, Washington. This includes evaluating navigation channel realignment in the Point Chehalis/Entrance reach. It is hypothesized that relocating the channel to align with natural channel migration will reduce future annual dredging quantities. However, the most heavily used dredged material placement sites lie in proximity to the Federal navigation channel. Thus, the goal of this numerical modeling study was to assess the impact of the three dispersive dredged material placement sites on future channel maintenance dredging.