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of research needs identified fall in the categories of analysis of existing 

 data, new data, and new technology. 



7.4.1 Analysis of Existing Data 



Isolation of Anthropogenic Effects - The substantial effects that 

 navigational structures and sand management practices at entrances can have 

 on shoreline stability have been noted and illustrated by the examples in 

 Figs. 7.8 and 7.9. Similar effects are known to occur and be substantial 

 at many other locations, i.e.. Folly Beach, SC , Tybee Island, GA, Santa 

 Barbara, CA, and Assateague Island, MD . In addition to the effects at 

 entrances, the effects of groins, seawalls, etc. should be considered. A 

 straightforward methodology could be applied; however, it is believed that 

 development of new, more effective methodology would be worthwhile. 



Regional Correlation of Shoreline and Sea Level Change Rates - 

 Previous estimates of long-term shoreline change have been developed (U.S. 

 Army Corps of Engineers, 1973; Dolan et al . , 1983). These estimates are 

 available on a state wide basis and regionally (such as the entire Atlantic 

 coast) . It would be a useful and instructive first broad-brush effort to 

 correlate these estimates with local estimates of sea level rise over the 

 past 50 years or so. 



7.4.2 New Data 



Quantification of Cross -shore Sediment Budget Components - Referring 

 to Eq. 7.17, the focus of this research element would be to quantify the 

 three terms on the right hand side. The complete methodology has not been 

 developed as yet, but would probably consist of long-term observations of 

 offshore stakes to determine total vertical change, studies of biogenic 

 production and attrition and deposition rate by suspended sediment traps. 

 It would be useful to conduct this element in conjunction with the 

 experimental element of "Evidence from the Continental Shelf" to be 

 described below. 



Shoreline Monument System - The state of Florida maintains a 

 monumented baseline around 1,030 km of sandy shoreline. Since the early to 



