(a) 4 December 1973 Beach profile survey, but 



storm did not reach area 



(b) 14-15 December 1973 7- to 9-foot-high breakers 

 17 December 1973 Beach profile survey 



(c) 8 January 1974 6- to 8-foot-high breakers 



10 January 1974 Beach profile survey 



(d) 19-20 February 1974 7-foot-high breakers 

 21 February 1974 Beach profile survey 



(e) 4-8 March 1974 Storm 6- to 9-foot-high breakers 



11 March 1974 Beach profile survey 



Since most of these events were occurrences of high waves, there was 

 no way to predict the waves and make a "before survey." The most signifi- 

 cant occurrence of high waves during the 1973-74 winter season was on 

 8 January 1974 which was coincident with a +7 -foot-high tide which caused 

 considerable change in the configuration of the beach profile. These 

 changes are described in greater detail as part of the seasonal changes 

 between November 1973 and April 1974. 



Comparisons of pressure sensor records from February 1973 with the 

 winter of 1973-74 show February 1973 to have been a period of high waves. 

 The mean significant height derived for February 1973 is 1.4 meters as 

 compared to 1.0 meter for the winter of 1973-74, and, in fact, the high- 

 est waves observed during the study occurred during February 1973. Thus, 

 the mean height of waves during February 1973 was approximately 30 percent 

 greater than that of other winter months. A check of annual precipitation 

 records for the San Diego region also suggests that 1972-73 was one of the 

 four wettest years in the last 20 years. Since most of the precipitation 

 in San Diego area comes from winter storms, this may be a reasonable indi- 

 cation of the severity of the winter season. 



VI. CONCLUSIONS 



The beach profile measurements at Torrey Pines Beach, California, 

 have provided some insight into the seasonal changes in beach profile 

 configuration on a straight beach with uniform offshore slope that is 

 exposed to waves from all offshore quadrants. The conclusions of this 

 study can be summarized as follows: 



1. The three range lines established on Torrey Pinces Beach 

 responded in a similar manner in all sand level changes so that the study 

 site section of beach was not anomalous along its length. 



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