a Zeiss Elta-2 total station surveying system described by Birkemeier and 

 Mason (1984). Each profile estended seaward from the baseline behind the dune 

 to a water depth of about 10 m, within 0.6 km north and south of the FRF pier. 

 Their locations are shown in Figure CI of Appendix C. The survey accut acy was 

 about ±3 cm horizontally and vertically. Soundings along both sides of the 

 FRF pier were included by the use of a technique which consisted of lowering a 

 weighted measuring tape to the bottom, and then recording the distance below 

 the established pier deck elevation. Measurements were made midway between 

 the pier pilings to minimize errors caused by scour near the pilings. 

 Analysis 



51. The pier, beach, nearshore, and offshore data were reduced to 

 position (X,Y) and depth (Z) triplets relative to established monumentation 

 and NGVD, respectively. The data were listed, and a display of the profiles 

 (i.e., distance along the range versus elevation) was generated for visual in- 

 spection. After the data were edited, another set of routines was used to 

 compute contour diagrams of the bottom topography and time sequences of bottom 

 elevations at selected locations along the pier. 



Photographic Data 



Aerial photography 



52. Quarterly aerial photographic missions were performed using a 

 9-in. -negative format mapping aerial camera that is capable of producing 

 black/white and color photography. All coverage was at least 60 percent 

 overlap, with flights flown as close as possible to low tide between 1000 and 

 1400 hours with less than 10 percent cloud cover. 



53. The photographs obtained on 26 January, 27 April, and 3 October 

 were concentrated near the FRF (Figure 3), while those obtained on 8 July also 

 included coverage from Cape Henry, Va., to Cape Hatteras, N. C. 



Beach photography 



54. Daily color slides of the beach were taken using a 35mm camera from 

 the same location on the pier, looking north and south. The location from 

 which each picture was taken and the date, time, and a brief description of 

 the picture were marked on the sides; and an inventory was maintained. 



27 



