29 Jan 2021

Simulations of Shoreline Changes along the Delaware Coast

Abstract: This technical report presents two applications of the GenCade model to simulate long-term shoreline evolution along the Delaware Coast driven by waves, inlet sediment transport, and longshore sediment transport. The simulations also include coastal protection practices such as periodic beach fills, post-storm nourishment, and sand bypassing. Two site-specific GenCade models were developed: one is for the coasts adjacent to the Indian River Inlet (IRI) and another is for Fenwick Island. In the first model, the sediment exchanges among the shoals and bars of the inlet were simulated by the Inlet Reservoir Model (IRM) in the GenCade. An inlet sediment transfer factor (γ) was derived from the IRM to quantify the capability of inlet sediment bypassing, measured by a rate of longshore sediments transferred across an inlet from the updrift side to the downdrift side. The second model for the Fenwick Island coast was validated by simulating an 11-year-long shoreline evolution driven by longshore sediment transport and periodic beach fills. Validation of the two models was achieved through evaluating statistical errors of simulations. The effects of the sand bypassing operation across the IRI and the beach fills in Fenwick Island were examined by comparing simulation results with and without those protection practices. Results of the study will benefit planning and management of coastal sediments at the sites.

29 Jan 2021

Mississippi River Adaptive Hydraulics Model Development and Evaluation, Commerce to New Madrid, Missouri, Reach

Abstract: A numerical, two-dimensional hydrodynamic model of the Mississippi River, from Thebes, IL, to Tiptonville, TN (128 miles/206 km), was developed using the Adaptive Hydraulics model. The study objective assessed current patterns and flow distributions and their possible impacts on navigation due to Birds Point New Madrid Floodway (BPNMF) operations and the Len Small (LS) levee break. The model was calibrated to stage, discharge, and velocity data for the 2011, 2015–2016, and 2017 floods. The calibrated model was used to run four scenarios, with the BPNMF and the LS breach alternately active/open and inactive/closed. Effects from the LS breach being open are increased river velocities upstream of the breach, decreased velocities from the breach to Thompson Landing, no effects on velocity below the confluence, and cross-current velocities greater than 3.28 ft/s (1.0 m/s) within 1186.8 ft (60 m) of the bankline revetment. Effects from BPNMF operation are increased river velocities above the confluence, decreased velocities from the BPNMF upper inflow crevasse (Upper Fuseplug) to New Madrid, cross-current velocities greater than 1.5 ft/s (0.5 m/s) only near the right bank where flow re-enters the river from the BPNMF lower inflow/outflow crevasse Number 2 (Lower Fuseplug) and St. Johns Bayou.

1 Oct 2019

Multi-stakeholder, During Nearshore Event Experiment begins pilot study

Duck, N.C., -- The collaborative During Nearshore Event Experiment pilot study is now underway along the Outer Banks of North Carolina, home to the U.S. Army Engineer Research and Development Center's Coastal and Hydraulics Laboratory’s Field Research Facility.

10 Sep 2019

PUBLICATION NOTICE: Validation of Numerical Modeling for Flows near Draghead in Operation

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CHL CHETN-V-24Title:Validation of Numerical Modeling for Flows near Draghead in OperationAuthor(s):Morgan M. Johnston and Allen HammackPurpose/Abstract:Fish and

6 Sep 2019

PUBLICATION NOTICE: Modeling Sediment Concentrations during a Drawdown Reservoir Flush: Simulating the Fall Creek Operations with HEC-RAS

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/TN RSM-19-7Title:Modeling Sediment Concentrations during a Drawdown Reservoir Flush: Simulating the Fall Creek Operations with HEC-RASAuthor(s):Stanford Gibson and

6 Sep 2019

PUBLICATION NOTICE: Feasibility of Nearshore Placement Near the Swinomish Navigation Channel; Puget Sound, Washington

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/TN RSM-19-6Title:Feasibility of Nearshore Placement Near the Swinomish Navigation Channel; Puget Sound, WashingtonAuthor(s):David R. Michalsen and Scott H.

28 Aug 2019

PUBLICATION NOTICE: Probabilistic Flood Hazard Assessment Framework Development: Extreme Rainfall Analysis

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CHL TR-19-14Title:Probabilistic Flood Hazard Assessment Framework Development: Extreme Rainfall Analysis Author(s):Brian E. Skahill and Joseph

28 Aug 2019

PUBLICATION NOTICE: A High-throughput Method for Counting Cyanobacteria Using Fluorescence Microscopy

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC TR-19-21Title:A High-throughput Method for Counting Cyanobacteria Using Fluorescence MicroscopyAuthor(s):Kaytee Pokrzywinski, Brandon Boyd, and Jarrell

23 Aug 2019

PUBLICATION NOTICE: Reducing Uncertainty and Improving Precision in Coincident Geospatial Datasets Using Weight-of-Evidence: Part 1

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CHL CHETN-XII-1Title:Reducing Uncertainty and Improving Precision in Coincident Geospatial Datasets Using Weight-of-Evidence: Part 1 Author(s):Jeffrey Cegan, Matthew

23 Aug 2019

PUBLICATION NOTICE: Coastal Modeling System: Dredging Module Simulation with Multiple Grain Sizes

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CHL CHETN-I-98Title:Coastal Modeling System: Dredging Module Simulation with Multiple Grain Sizes Author(s):Christopher W. Reed and Mitchell E.