(d) 28 March- 13 April 19 73 and 9-25 June 19 72 . Wind and water 

 level records for the remaining two erosion periods are shown in Figures 

 21 and 22. Both intervals showed instances of relatively strong onshore 

 winds combined with high water levels. Both also esdiibited strong longshore 

 winds which may be instrumental in developing obliquely incident waves or 

 wind-driven currents which increased littoral transport. 



(e) 14 November- 14 December 1970 . The largest mean increase in 

 volume occurred along the central reach during this interval. Winds were 

 mainly onshore but never severe (Fig. 23). The strongest winds (about 7.6 

 meters per second) occurred from the north on 25 November during a period of 

 low water level. The highest water during the interval occurred about 

 30 Noveirber to 1 December during light and variable winds. The increase in 

 sand volume along the central reach was general during the interval with 

 maximum and minimum of 17.6 and 1.1 cubic meters per meter at profile lines 

 7 and 17, respectively. In spite of the large net gain, profile lines 1 

 and 2 experienced a loss of sand. 



Figure 21. Wind velocity and water level recorded 

 at Wilmington, North Carolina, 28 March- 

 13 April 1973. 



44 



