CONTENTS-Continued 

 FIGURES 



Page 



1 Vicinity map, central California coast 7 



2 Sea and swell roses, west of Golden Gate 16 



3 Wave refraction diagram 17 



4 Location of bottom surveys, beach ranges, beach observation sites, and 



wave gage in Bolinas Bay 18 



5 Deepwater wave power (sea and swell) for various months at Station No. 3, 



California coast 19 



6 Wave power for Station No. 3 (California coast) compared with beach 



observations at Stinson Beach and Bolinas Bay 21 



7 Five-day moving averages of wave power from observations at Stinson Beach, 



Bolinas Bay, and the Bolinas wave gage 22 



8 Wave period and longshore currents, Stinson Beach State Park and Bolinas, 



California, 1968-69 24 



9 Areas of scour and fill between 21 August 1968, and 19 December 1968 .... 25 



10 Comparison of Bolinas Bay bottom contour maps of 17 May 1968, 



and 16 May 1969 26 



11 Seasonal variation of the position of the mean high tide line, Stinson Beach spit, 



1948-1970 28 



12 Day-to-day variation over a 4-month period of the horizontal distance from 



a reference point on shore to various beach contours, Stinson Beach spit, 



California 29 



13 Aerial vertical photo of Bolinas Lagoon inlet on 1 April 1945 32 



14 Aerial vertical photo of Bolinas Lagoon inlet on 31 August 1948 33 



15 Aerial vertical photo of Bolinas Lagoon inlet on 15 September 1959 34 



16 Aerial vertical photo of Bolinas Lagoon inlet on 10 November 1959 35 



17 Aerial vertical photo of Bolinas Lagoon inlet on 24 May 1961 36 



18 Aerial vertical photo of Bolinas Lagoon inlet on 19 June 1962 37 



19 Aerial vertical photo of Bolinas Lagoon inlet on 17 May 1968 38 



20 Aerial vertical photo of Bolinas Lagoon inlet on 9 November 1969 39 



21 Throat sections at Bolinas Lagoon inlet from U.S. Geological Survey 



tidal measurements 40 



