scholarly journals CREATION AND STABILIZATION OF COASTAL BARRIER DUNES

1968 ◽  
Vol 1 (11) ◽  
pp. 43 ◽  
Author(s):  
R.P. Savage ◽  
W.W. Woodhouse
Keyword(s):  
North Carolina ◽  
Barrier Islands ◽  
Coastal Barrier ◽  
Line Parallel ◽  
Sand Fences

Experiments are underway along the coast of North Carolina using sand fences and dune grasses to create and stabilize a barrier dune line parallel to and behind the existing beaches of low lying barrier islands. Several miles of experimental sections have been established, and their effectiveness in trapping wind-blown sand has been analyzed. Results to date (1968) show that sand fences and dune grasses will trap wind-blown sand and create a barrier dune. A vigorous, rapidly-growing strip of American beachgrass, 90 feet wide, will trap and retain all of the sand being transported by the wind in the area. Thus, a stabilized dune can be "grown" in the area using American beachgrass. Sand fences have been shown to be effective sand traps and can be used where satisfactory plants are not available or where it may not be feasible to await the establishment of vegetation. Two methods of using sand fences to create large dunes have been investigated; both are workable. The use of fabrics as sand fences has been investigated; their effectiveness varies with the porosity of the fabric.

Temporary late Holocene barrier-chain deterioration due to insufficient sediment availability, Wadden Sea, Denmark

Geology ◽  
2020 ◽  
Author(s):  
Mikkel Fruergaard ◽  
Lasse Sander ◽  
Jérôme Goslin ◽  
Thorbjørn J. Andersen
Keyword(s):  
Sea Level ◽  
Large Scale ◽  
Wadden Sea ◽  
Sediment Cores ◽  
Regional Scale ◽  
Barrier Islands ◽  
Seismic Profiles ◽  
Littoral Drift ◽  
Data Set ◽  
Coastal Barrier

Understanding the coupling between sediment availability and sea-level change is important for forecasting coastal-barrier (barrier islands and barrier spits) response to future sea-level rise (SLR). An extensive data set of sediment cores, seismic profiles, and a high-resolution chronology from the Wadden Sea (southeastern North Sea) documents that long-term barrier-chain progradation was interrupted by a period of widespread barrier deterioration between ca. 3.5 and 2.0 ka. The decay of the barrier islands resulted from a decrease in littoral drift triggered by regional-scale coastal reconfiguration. The formation of a large cuspate foreland updrift caused the depositional locus to shift away from the barrier coast. Our results demonstrate that the resulting reduction in marine sediment availability substantially decreased the stability of the barrier chain, causing the regional SLR thresholds to fall from between 2 and 9 mm yr–1 to ~0.9 mm yr–1, and thus below contemporary rates of SLR. Hence, we argue that predicting the response of barrier coasts to ongoing SLR requires consideration of possible changes in sediment availability and the role of large-scale geomorphological feedbacks due to human and natural causes.

scholarly journals EXPERIMENTAL STUDY OF DUNE BUILDING WITH SAND FENCES

2011 ◽  
Vol 1 (8) ◽  
pp. 22
Author(s):  
Rudolph P Savage
Keyword(s):  
Experimental Study ◽  
North Carolina ◽  
The State ◽  
Beach Erosion ◽  
Corps Of Engineers ◽  
Outer Banks ◽  
Windblown Sand ◽  
Sand Accumulation ◽  
Sand Fences ◽  
Made In

In 1957 the State of North Carolina, in cooperation with the Beach Erosion Board and the Wilmington District of the Corps of Engineers undertook an experimental dune building study on the Outer Banks of North Carolina. The experimental study consists of the construction of various types and arrangements of sand fences to determine the fence type and arrangement most effective in building a dune by trapping windblown sand. Four miles of experimental fencing were constructed in 1960. During the following year, four sets of profiles were made to determine the sand accumulation of the fences and a rather intermittent wind record was made in the area. The performance of the various fence types and arrangements has been compared and some conclusions have been reached concerning the best fence type and arrangement.

Scale-dependent movements and protection of female blue crabs (Callinectes sapidus)

2006 ◽  
Vol 63 (4) ◽  
pp. 858-871 ◽  
Author(s):  
David A Medici ◽  
Thomas G Wolcott ◽  
Donna L Wolcott
Keyword(s):  
North Carolina ◽  
Site Fidelity ◽  
Callinectes Sapidus ◽  
Barrier Islands ◽  
Mature Female ◽  
Outer Banks ◽  
Small Areas ◽  
Adult Females ◽  
Temporary Protection ◽  
Pamlico Sound

Little is known about the migration of female crabs (Callinectes sapidus) to spawning grounds, or how effectively they are protected by North Carolina's “spawning sanctuaries.” To investigate migration, we tagged and released a total of 2700 mature female crabs in the fall of 2001 and the summer and fall of 2002 in the three tributaries of Pamlico Sound. Tag returns indicate that females begin migration during September to November and that they probably do not complete it until the next spring. To assess site fidelity and protection of females by spawning sanctuaries, 398 tagged adult females were released in or near sanctuaries at Ocracoke and Hatteras inlets. Most recaptures occurred near the barrier islands (Outer Banks), suggesting that mobility declines once females reach euhaline waters, but recapture data also showed that crabs move over scales larger than sanctuaries and derive only temporary protection by entering sanctuaries. Ovigerous females fitted with ultrasonic pingers were tracked after release inside the boundary of Ocracoke spawning sanctuary. Crabs with orange (new) egg masses meandered over small areas, but those with eggs approaching hatching moved directly seaward. Apparently spawning sanctuaries must be large to be effective; where this is not practical (as in North Carolina), other strategies should be considered.

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