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Title: Beach and Borrow Site Sediment Investigation for a Beach Nourishment at Ocean City, Maryland
Authors: Anders, Fred J.
Hansen, Mark (Mark Erik)
Coastal Engineering Research Center (U.S.)
Keywords: Shore protection--Maryland--Ocean City
Coastal engineering--Maryland--Ocean City
Fills (Earthwork)--Maryland--Ocean City
Embankments--Maryland--Ocean City
Publisher: U.S. Army Engineer Waterways Experiment Station
Series/Report no.: Technical Report (U.S. Army Engineer Waterways Experiment Station);CERC-90-5
Abstract: Native beach sediment and sediment from nine potential borrow sites were investigated at Ocean City, MD, during 1986 to 1987 for design of a beach nourishment project. The project, as finally completed, constructed a beach 8 miles long with a 100-ft-wide berm. A total of 2.7 million was removed from two borrow sites and placed on the beach. This report discusses the methodology used in sampling and analyzing sediment from the native beach and each borrow site. Beach samples were collected at periodic intervals along 36 profile lines perpendicular to the beach. Samples extended from the upper berm to -30 ft National Geodetic Vertical Datum. Grain size was computed for each sample, and a grand composite sample was computed for the entire beach. Results suggest that this technique collected and analyzed more samples than were necessary. Sampling schemes should be closely tied to local profile closure depth and take advantage of natural alongshore consistency in grain size. A streamlined sampling plan could also benefit the final calculated composite and improve the chance of nourishment success. Temporal changes in sediment were examined through a one-time beach coring program that sampled the entire active envelope of sediment. Borrow sites were investigated through a combination of geophysical surveys and vibracores. Subbottom profile data were useful in locating potential coring sites. Channel samples were removed from each core, and grain size analyses were performed. Composite samples were calculated for each borrow site and compared with the native beach composite to develop overfill ratios. Data from the cores, along with environmental and political considerations, reduced the number of potential borrow sites from nine to three. The volume of acceptable material available in each borrow site was calculated and compared with the required volumes from each site. Several improvements in planning data collection and analysis are suggested to facilitate borrow site evaluation.
Description: Technical Report
Gov't Doc #: Technical Report CERC-90-5
Rights: Approved for public release; distribution is unlimited
Size: 101 pages / 4.313Mb
Types of Materials: PDF/A
Appears in Collections:Technical Report

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