Knowledge Core Collection:https://hdl.handle.net/11681/467492024-03-29T09:05:53Z2024-03-29T09:05:53ZBeach and Borrow Site Sediment Investigation for a Beach Nourishment at Ocean City, MarylandAnders, Fred J.Hansen, Mark (Mark Erik)Coastal Engineering Research Center (U.S.)https://hdl.handle.net/11681/344372023-04-05T12:17:27Z1990-05-01T00:00:00ZTitle: 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.)
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 Report1990-05-01T00:00:00ZBeach nourishment project response and design evaluation : Ocean City Maryland. Report 1, 1988-1992Stauble, Donald K.Garcia, Andrew W.Kraus, Nicholas C.Grosskopf, William G.Bass, Gregory P.https://hdl.handle.net/11681/337832023-04-05T12:17:00Z1993-08-01T00:00:00ZTitle: Beach nourishment project response and design evaluation : Ocean City Maryland. Report 1, 1988-1992
Authors: Stauble, Donald K.; Garcia, Andrew W.; Kraus, Nicholas C.; Grosskopf, William G.; Bass, Gregory P.
Abstract: Detailed monitoring of the performance of a two-phase beach nourishment project has provided valuable information on beach fill behavior and long-term response of a beach fill to prevailing coastal processes. The Atlantic Coast of Maryland (Ocean City) Shoreline Protection Project began with placement of a recreational beach by the State of Maryland during the summer of 1988. Within three months of placement, four storms impacted the area. Recovery was monitored for an additional two years. In the summers of 1990 and 1991, additional fill material including a storm protection dune was placed by the U.S. Army Corps of Engineers as a second phase for the purpose of storm protection. Within a year of the first placement, two large storms impacted the project. Initial recovery was also documented. Project monitoring included 12 profile survey lines, sediment collection, and placement of two dedicated wave gauges. The beach nourishment project performed well in protecting the beachfront infrastructure of Ocean City from storm damage. The fill material was eroded from the foreshore after the major storms of 1989 and 1991/92, but could be accounted for in the nearshore between the shoreline and closure. Representative profile survey locations show the differential behavior of the fill controlled by nearshore bathymetric variability along the project length. The 37th Street location represents the flatter, bar/trough type profile typical of the southern portion of the fill. Localized "hot spots" of erosion occurred in areas where a shoal system attaches to the shoreface, as shown at 81st Street. The erosion pattern associated with these shoals was probably produced by wave convergence and divergence over these features. Analysis of sediment characteristics of samples collected during the State fill project showed the influence of the fill material on the native beach and the change in sorting after the passage of four storms. Composites were constructed of the foreshore and nearshore samples to account for cross-shore variability in grain size distribution. The coarsest foreshore and finest nearshore composite fill material was found in the northern end of the project, with the opposite found to the south. Storm impact placed coarse foreshore lag material at the erosional 81st Street location and finer material at the more stable 37th Street location. After 9 months, the fill material was taking on the characteristics of the pre-fill native beach.
Description: Technical Report1993-08-01T00:00:00ZTechnologies for assessing the geologic and geomorphic history of coastsMorang, Andrew, 1953-Mossa, Joann, 1959-Larson, R. J.https://hdl.handle.net/11681/337632023-04-05T12:16:41Z1993-03-01T00:00:00ZTitle: Technologies for assessing the geologic and geomorphic history of coasts
Authors: Morang, Andrew, 1953-; Mossa, Joann, 1959-; Larson, R. J.
Abstract: The geologic and geomorphic history of coastal areas can be assessed using a four-part process: o Thorough examination of technical literature and existing data from various archives. o Field data collection and observation. o Laboratory examination of samples collected in the field. o Office interpretation of all project data, both newly collected and historic. It is vital that existing sources of data be evaluated before field studies are undertaken to prevent duplicating efforts and to guide theĀ· optimum sampling scheme. Field studies must be designed to answer basic questions about the study area: o What physical processes affect the region? o Does the underlying geology have a major influence? o How has man modified or damaged the local environment? o How much data can we afford to collect? o Do we have the knowledge, ability, managerial skill, or money to properly analyze the data we want to collect at the project site? o Is it more important to conduct a long-term sampling program or a shorter, more intensive program? Coastal scientists must be aware of how historic data were collected, and what assumptions and procedures were used by the original field technicians and analysts. The quality of historic data may vary from excellent to worse than useless. The use of instruments in the coastal zone is far from straightforward; incorrect use of instruments may lead to erroneous results because the wrong parameters may be monitored. Coastal engineers are urged to consult specialists in the field to help plan and conduct field studies. The analysis of contemporary coastal data is difficult and also requires the skills of specialists with experience in the particular types of instruments and methods that have been used.
Description: Technical Report1993-03-01T00:00:00ZHalloween storm and storm of 4-5 January 1992 : implications for the occurrence of similar eventsGarcia, Andrew W.https://hdl.handle.net/11681/333232023-04-05T12:16:24Z1996-01-01T00:00:00ZTitle: Halloween storm and storm of 4-5 January 1992 : implications for the occurrence of similar events
Authors: Garcia, Andrew W.
Abstract: During the winter of 1991-92, two intense storms caused extraordinary damage along the eastern seaboard of the United States. The most notable of these storms occurred from 29 October to 2 November 1991, and is commonly referred to as the "Halloween Storm.'' This report uses factors other than coastal water levels to assign "frequency of occurrence" or "return interval" to events such as the Halloween Storm. The approach used focuses on storm characteristics rather than the effects of the event. These characteristics include the duration, intensity, size. area of origin, and track. In addition, meteorological records for approximately the past 30 years were examined for systems which exhibited track characteristics similar to those of the Halloween Storm. Correlation of other characteristics will require further study and will be explained in subsequent reports.
Description: Technical Report1996-01-01T00:00:00Z