Southwest Washington Littoral Drift Restoration Project: Design, Construction, and Monitoring
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1 Southwest Washington Littoral Drift Restoration Project: Design, Construction, and Monitoring J Jessica i St Stokke kk USACE Portland District October 28, 2010 WEDA Pacific Meeting Monterey, CA US Army Corps of Engineers BUILDING STRONG
2 Outline Historical i Background Project Purpose Design Construction Monitoring Future
3 Historical Background North Head Shoreline 1913 Construction of the MCR jetties produced dramatic sand accretion along the Benson Beach shoreline Benson Beach North Head Shoreline * hea d of jett y in Now, there is no longer Benson Beach has receded 2,000 ft since 1939 enough sediment supply to overcome e natural erosion o 2002 *
4 Project Purpose Pump material directly into the intertidal zone Monitor how effectively the placed material remains within the overall littoral sediment budget Compare the effectiveness and efficiency of this method with conventional nearshore open water placement Ultimate objective: Determine the best placement method to support the littoral zone sediment budget at the Mouth of the Columbia River (MCR)
5 A decade in the making Timeline of Events Federal Regional Sediment Management (RSM) Appropriations Added Concept Initiation; Demonstration Project WRDA Jetty foredune damaged by severe storms: N Jetty Interim Berm Repair # WA State Incremental Funding Omnibus Appropriations Act 2009 Jetty foredune damaged again by winter storms 2010 N Jetty Berm Interim Berm Repair #2 SW WA Littoral Drift Restoration Project
6 Present Concept for Sediment Budget
7 Cross-Shore Profile Nearshore vs. Intertidal Placement mean sea level Intertidal Placement 30 0 Nearshore Placement n (ft, MLLW) Elevatio -90 Seabed Miles (West) Offshore from Shores Edge
8 Peacock Spit SWS N Use of the nearshore SWS has reduced the rate of recession on Peacock Spit.
9 View to the Northwest Peacock Spit Littoral Drift Project Placement Area SWS ODMDS NJ Site 2640 ft Clatsop Spit Distance from tip of south jetty to tip of north jetty is 2 miles
10 Project Design View to South Benson Beach 4,500 ft Water level at 0 ft MLLW -5 ft 0 ft 10 ft Benson Beach BUILDING View STRONG to North
11 Construction Dodge Island hopper dredge pumping material over the North Jetty
12 Construction Placement of material in surf zone
13 Construction Results Design Cross Section MHHW MLLW Target Fill Template Grade Existing shoreface grade Post-construction survey As-Built MHHW Cross Section Preconstruction survey MLLW
14 Monitoring Topo/Bathy Surveys ARGUS beach monitoring system Wave/Current/ Suspended Sediment Pods Sand Tracer Study * SWAN & Delft-3D Models Aerial Photography CLARIS survey *
15 Monitoring Topo/Bathy Surveys WDOE, OSU, USGS June 2010 December 2011
16 Survey Results Feature Forming
17 Monitoring Morphological Changes Feature Forming Offshore sand bars
18 ARGUS Beach Monitoring System NW Research Associates June 2010 December
19 Monitoring Foreshore Dynamics Feature
20 Intertidal Volume Change Erosion Accretion (m 3 ) Dates Jan 2004 Sept 2009
21 ARGUS Cameras Results Low Tide High Tide * * Mid-construction September 9, 2010
22 Monitoring Wave, Current, and Suspended Sediment Pods WDOE, Golder Associates June 2010 December 2010
23 Monitoring Sediment Tracer Tracer particle in native sand with white light tracer particle now with Fluorescence illumination Science Applications International Corporation (SAIC), Evans-Hamilton, Inc. (EHI) June 2010 Spring 2012
24 2010 Tracer Release Sites Sediment Tracer Study Results Nearshore placement site 2007
25 Monitoring SWAN Model Simulating WAves Nearshore -Wave height with bathymetry contours and directions- Professor H. Tuba Özkan-Haller, OSU
26 Monitoring Delft-3D Model Hydrodynamic, Sediment Transport, & Morphological Modeling USGS June 2010 to spring 2012 Ebb Tide
27 Monitoring Aerial Photos June 2010 November 2010
28 USACE ERDC CLARIS Survey Coastal Lidar And Radar Imaging System Integrated Topography & Nearshore Bathymetry Radar Image
29 Monitoring Topo/Bathy Surveys ARGUS beach monitoring system Wave/Current/ Suspended Sediment Pods Sand Tracer Study * SWAN and Delft-3D models Aerial Photography CLARIS survey *
30 Future Pre-construction 7/17/10 Construction complete 9/22/10 Feature is already dispersing Post-construction 10/20/10
31 Future Monitoring continues thru Spring 2012 Analysis report will include findings and recommendations for future placement Nearshore placement every year Intertidal placement every year? every few years? Final Report: Summer 2012
32 Questions? BUILDING STRONG
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