EWN home page EWN banner

Archived EWN Projects

Archived EWN Projects

Evaluation of Bioaccumulation Control in Aquatic Sites Using Activated Carbon (project details)

Sediments in the urban harbors often exhibit elevated levels of PCBs bioaccumulation, limiting their suitability for beneficial use or placement in aquatic sites. Amendment of dredged material in the bioactive zone with activated carbon has the potential to provide bioaccumulation control, permitting expanded use of aquatic placement where CDF capacity is being exhausted. Prior to this study, an application of activated carbon in a conventional mechanical dredging operation has never been demonstrated in a navigation dredging project.

  • POC: Paul Schroeder
  • Email: Paul.R.Schroeder@usace.army.mil
  • Project Fact Sheet (PDF)
  • Products:
    • ERDC Technical Notes
    • Schroeder, P.R., D.R. Felt, B. W. McComas. IN PRESS. Examination of activated carbon losses during open water placement of amended dredged material for bioaccumulation control ERDC TN-DOER-XXX. Vicksburg, MS: US Army Engineer Research and Development Center.
    • Schroeder, P.R., Felt, D.R., and McComas, R. IN PRESS. Effects of Activated Carbon Dosage for Aquatic Bioaccumulation Control in Dredged Material, ERDC TN-DOER-XXX. Vicksburg, MS: US Army Engineer Research and Development Center.
    • Schroeder, P. R., B. W. McComas. Effects of activated carbon dosage for aquatic bioaccumulation control. Proceedings of the Tenth (10th) International Conference on the Remediation and Management of Contaminated Sediments, New Orleans, Louisiana, USA, February 11-14, 2019.
    • Abstract (PDF)
    • Platform Presentation (PDF)
    • Schroeder, P. R. and B. W. McComas. Treatment - expanding dredged material management alternatives. Proceedings of the Western Dredging Association Dredging Summit & Expo '19, Chicago, Illinois, USA, June 4-7, 2019.
    • Abstract (PDF)
    • Platform Presentation (PDF)
    • Schroeder, P. R. Bioaccumulation control at open water placement sites by dredged material amendment with activated carbon. Webinar presentation for the Dredging Operations Technical Support Webinar series, July 17, 2019.
    • Webinar (PDF)
    • Schroeder, P. R., M. G. Channell, C. E. Ruiz, B. W. McComas, C. C. Carrillo. Bioaccumulation control demonstration at Ashtabula open water placement site. Proceedings of the Ninth (9th) International Conference on the Remediation and Management of Contaminated Sediments, New Orleans, Louisiana, USA, January 9-12, 2017.
    • Abstract (PDF)
    • Poster (PDF)
    • Schroeder, P. R., M. G. Channell, C. E. Ruiz, B. W. McComas, C. C. Carrillo. "Open water placement demonstration of amended dredged material for bioaccumulation control," Proceedings of the Twenty-First World Dredging Congress, WODCON XXI, Miami, Florida, USA, June 13-17, 2016.
    • Proceedings Paper (PDF)

Resilience of Nature Based Features for Protection of Constructed Wetlands (project details)

Wetlands support both habitat and flood risk reduction missions of the Corps. Wetlands that are managed or supported by the Corps are often near navigation infrastructure or in open-water. Therefore, protection from erosive forces is sometimes required. The Corps therefore builds berms to absorb wave energy and protect both constructed and natural wetlands from erosive forces produced by naturally occurring waves or navigation activity. These constructed berms are typically sandy. Dredged sediment is sometimes used in the construction process. However, most dredged sediment is a mixture of sand, silt and clay which limits their application to berm construction. Increased use of mixed sediment for construction of protective berms would greatly expand this sustainable, beneficial use of dredged material.

EWN Atlas Highlighting NNBF Projects (project details)

There is tremendous interest internal to USACE and elsewhere to integrate a suite of EWN case studies that highlight natural and nature-based features (NNBF) projects. In turn, this “Atlas” Report would provide an inventory, which is comprised of a diverse grouping of projects (national and international), that exemplifies the utility of EWN solutions.

Parametric Study of Belowground Biomass on Short-term Dune Evolution (project details)

Dunes have, and continue to be, natural or engineered features which prevent or delay flooding of inland areas by waves and storm surge. Currently, morphological models do not consider the effect of vegetation when estimating short-term dune response to erosional events. A previous study showed that aboveground and belowground plant structure significantly reduced the erosion of coastal dunes under both collision (scarping) and overtopping regimes.

Wave Attenuation in Vegetation (project details)

The bottom friction dissipation in spectral wave models (SWAN, MIKE SW, STWAVE, etc.) is commonly frequency dependent, while the dissipation due to vegetation only partially accounts for the frequency of the various wave components. For the bottom friction term, the shorter waves may locally be in deep water conditions, while the longer waves are in intermediate to shallow water conditions. Consequently, there exists a cut-off frequency above which the dissipation due to bottom friction vanishes. This cut-off frequency is also applicable to dissipation from submerged vegetation canopies.

  • POC: Brian C. McFall
  • Email: Brian.C.McFall@usace.army.mil
  • Project Fact Sheet (PDF)
  • Products:
    • Jacobsen, N. G., B. C. McFall, D. A. van der A. 2019. A frequency distributed dissipation model for canopies. Coastal Engineering 150:135-146. https://doi.org/10.1016/j.coastaleng.2019.04.007
    • Abstract
      Existing dissipation models (bulk and frequency distributed) describing the wave attenuation in canopies rely on a characteristic shape of the velocity profile and corresponding characteristic frequency, which is integrated analytically over the height of the canopy. This means that all frequencies higher than the characteristic peak frequency are assigned excessive dissipation, while all frequencies lower than the characteristic peak frequency are assigned insufficient dissipation.

      The present work presents a new dissipation model, which is given in a closed form based on the surface elevation spectrum, Sη. The model calculates the frequency dependent dissipation at a given vertical elevation z, which is numerically integrated over the height of the canopy. A comparison with existing bulk dissipation models shows that there are large differences between the existing models and the present work. These differences are particularly noticeable for realistic peak enhancements factors for the JONSWAP spectrum (1.0–10.0) and submerged canopies.

      A comparison with the frequency distributed dissipation model in the spectral wave model SWAN is also presented and the present model distinguishes itself by naturally incorporating a cut-off frequency above which the dissipation effectively vanishes. This offers a more realistic frequency distribution of the dissipation. The frequency distribution of the dissipation and the existence of a frequency cut-off is verified with experimental data.

Management of Savannah Harbor Dredged Material Containment Areas (project details)

The USACE Savannah District conducted bimonthly bird surveys from 1994 to 2012 on six dredged material containment areas (DMCAs) located on the South Carolina side of the Savannah Harbor. The DMCAs are included in a long-term management strategy (LTMS) to enhance habitat for waterbirds. Some DMCAs received dredged material on a 3-year rotation, while other DMCAs were dried for 3-years. Two islands have been constructed in each DMCA to create nesting habitat for state-listed threatened and endangered birds, plus other birds listed as sensitive or of concern. During this period, the District has acted to ensure approximately 505 acres of inundated habitat and 659 acres of wetland habitat are maintained each year.

  • POC: Michael Guilfoyle
  • Project Fact Sheet (PDF)
  • Products:
    • ERDC Technical Report
      • Covington, Ellie L., Richard A. Fischer, Michael P. Guilfoyle, and J. S. Calver. 2016. Birds of the Savannah Harbor Navigation Project, Dredged Material Disposal Areas, 19942012. No. ERDC-EL-TR-16-4. Vicksburg, MS: U.S. Army Engineer Research and Development Center. http://hdl.handle.net/11681/6851

Landscape Evolution of the Oil Spill Mitigation Sand Berm in the Chandeleur Islands, Louisiana (project details)

This Engineering With Nature project will monitor the short-term evolution of the sand berm to provide measures of berm performance and potential impacts to the Chandeleur Islands. Project data and deliverables will increase sediment management scoping, screening, and operations efficiencies; and increase predictive and adaptive management capabilities.

Large Wood National Manual: Guidelines for Planning, Design, Placement, and Maintenance of Large Wood in Fluvial Ecosystems; Restoring Process, Function, and Structure (project details)

Research interest in the multiple significant roles large wood plays in fluvial ecosystems has exploded in past decades, but restoration practice has only recently begun to use it in quantity, and primarily only in the Pacific Northwest. A meeting between the U.S. Army Engineer Research and Development Center’s Environmental Laboratory (EL) and the Bureau of Reclamation (BoR) in 2011 determined that research and guidance on using large wood in river and floodplain restoration represent top national priorities. EL and BOR have formed a partnership to produce a comprehensive, state of practice guidance manual.

Realizing a Triple Win in the Desert: Systems-level Engineering With Nature on the Rio Grande (Albuquerque, NM) (project details)

Three recently completed system-level studies on the Middle Rio Grande (MRG) used EWN to achieve sustainable development of water resources in the desert. These studies balanced social, environmental, and economic considerations using traditional benefit metrics (i.e., habitat units) to support transparent decision-making. The MRG projects are being measured to capture the benefits of ecosystem goods and services.

Portfolio Framework to Quantify Beneficial Use of Dredged Material (New Orleans, LA and New England) (project details)

This EWN Action Project is currently developing a quantitative portfolio approach based on the potential beneficial uses of dredged material in a single season of dredging. Developing a portfolio requires additional research into resulting benefits, including the amount of enhancement as a function of the material properties and the benefits achieved from the project. These benefits are not easily monetized, but the portfolio will provide information that could be used for economic valuation.

Ashtabula Breakwater Tern Nesting Habitat Demonstration Project (Ashtabula, OH) (project details)

The Ashtabula breakwater tern nesting demonstration project assesses whether suitable habitat can be created on the harbor breakwater by making simple, low cost modifications to the concrete blocks used to repair the breakwater. Design includes incorporation of suitable nesting substrate (gravel) and predator deterrence features. If the demonstration is successful, it will provide a means of returning the common tern (Sterna hirundo) to the local avian community. Historically, the common tern nested in the area, but has not been recorded locally for decades due to the lack of suitable habitat.

  • POC: Burton Suedel
  • Project Fact Sheet (PDF)
  • Products:
    • ERDC Technical Notes
      • Guilfoyle, Michael P., Richard J. Ruby, Burton C. Suedel, Thomas J. Fredette, Paul Bijhouwer, Andrew Hannes, Karen Adair, Cynthia J. Banks, and Anthony M. Friona. 2017. Creating Nesting Habitat for the Common Tern (Sterna hirundo) on the Repaired Ashtabula Breakwater: Lessons Learned 2014–2016. ERDC-TN-EWN-17-3. Vicksburg, MS: U.S. Army Engineer Research and Development Center. http://hdl.handle.net/11681/24825
      • Fredette, T. J., Ruby, R. J., Bijhouwer, P., Suedel, B. C., Guilfoyle, M., Kromer, M., & Adair, K. (2016). Ashtabula Breakwater Common Tern (Sterna Hirundo) Nesting. ERDC-TN-EWN-16-1. Vicksburg, MS: U.S. Army Engineer Research and Development Center. http://hdl.handle.net/11681/20250

A Sustainable Design Manual for Engineering With Nature Using Native Plant Communities (project details)

The Sustainable Design Manual describes how to utilize plant communities within the built environment and to create sustainable landscapes. This design manual is important because it promotes our native plant communities, which in turn supports native fauna. Many plant communities exist on USACE lands and will provide stability in designed landscape elements that are part of USACE facilities and landscapes nationwide.

Strategic Placement of Sediment for Engineering and Environmental Benefit (project details)

Strategic placement of dredged sediment is the practice of cost-effectively placing sediment at dispersive sites so that natural forces can transport the sediment toward desired receptors. The sediment is thus maintained beneficially in the regional system. The objective of this research effort is to provide guidance for strategic placement options that benefit navigation, flood risk management, and environmental resource missions of the Corps. Products will outline the synergy between strategically placed sediments and benefits to nearby receptors.

Sediment Retention Engineering to Facilitate Wetland Development (San Francisco Bay, CA) (project details)

This EWN Action Project monitors two restoration sites in San Francisco Bay to evaluate project performance including reduction in wave energy, circulation, sedimentation, channel morphology, and vegetative cover as a function of berm morphology. The results will be used to develop guidelines and best practices in the design of berms intended to speed accretion and channel formation in bay restoration projects.

Atchafalaya River Island Creation Project (Morgan City, LA) (project details)

This EWN Action Project provides biological and hydrological monitoring data to quantify benefits and otherwise improve our understanding of the maturation of beneficial use of dredged material within the Atchafalaya Basin. The project documents how a river island is successfully created using dredged material in a beneficial manner, taking advantage of the natural hydrological processes inherent in the system. Project findings will help direct future dredged material placement practices in the basin and other riverine systems.

Living Shoreline Creation Through Beneficial Use of Dredged Material (Duluth, MN) (project details)

This EWN Action Project identifies and develops low-cost, shallow-water dredged material placement methods, utilizing both engineered and natural processes. These methods maximize the habitat value of the dredged material used for Areas of Concern habitat restoration projects. Finding cost-effective approaches for material handling that achieve the desired habitat is critical for development of future shoreline habitat restoration projects in the Great Lakes.