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 OISTRNCE I ») 

 PROFILE COMPARISON FOR SURVEYS OF 7 PROFILE LINES AT 

 flTLflNTIC CITY.NJ 



u/it/n. II. 



Figure 2. Example cross-section plot 



13. In order to quantify the effect of each storm, a number of summary 

 statistics have been computed for each table. These include the mean and 

 standard deviation along with the median, tri-mean, high hinge, and low hinge 

 values. These last four parameters, defined by Tukey (1977), are more robust 

 (less sensitive to extreme values) than are the mean and standard deviation, 

 and they provide a measure of the distribution of the changes among the 

 different profile lines. They are particularly useful for summarizing 

 profile changes along a beach because of the natural and occasionally 

 unnatural variation that occurs between lines. Single lines may be affected 

 by local structures, inlets, or survey errors to the point of biasing a mean 

 value of the volume or shoreline change. However, a single profile change 

 will have little impact on the median change. 



10 



