guy lines running from the upper corners of the 

 tripod to 100-pound danforth type anchors (fig. 17). 

 In spite of moderately heavy surf action, considerable 

 success was achieved in maintaining the equipment in 

 continuous operation. Following one south storm it 

 was necessary to relevel the float well and tripod; 

 however, the procedure is generally applicable to 

 making short term tide studies in remote and un- 

 protected acreos where a more permanent installation 

 is impractical or unwarranted. 



Tidal measurements ore summarized in figure 

 18. The height of water given in inches is based on 

 actual staff readings with zero representing the 

 ocean floor at the tide stand. A permanent inshore 

 bench mark has been established which will permit 

 correlating future observations. All times listed are 

 Bering Standard. The graphic presentation indicates 

 the character of the tidal cycles measured. 



A stage height ratio of 5 inches of chart equal 

 to 60 inches of water and a time scale of approxi- 

 mately 1 millimeter equal to 30 minutes were the 

 instrument recording chart coordinates. The estimated 



reading errors for the time of high and low tides is 

 of the order of 10 minutes and for tide heights is 

 plus or minus 0.2 inch. 



A complete analysis correcting for winds, bar- 

 ometric conditions, and other factors effecting tide 

 changes has not been made; however, the following 

 predominate features are noted from inspection of 

 the tidal data. The tides off Wales exhibit consider- 

 able diurnal inequality while the average period 

 indicates that the partial tide force is "principal 

 lunar" with the occurrence of high and low waters 

 normally characterized by a semidiurnal variation. 



Range between successive maxima and minima 

 are small, averaging 8 inches during the 9-week 

 observation period and ranging from a minimum 

 value of 0.2 inch to a maximum of 18 inches. Strong 

 local winds and storms over the Bering Sea/Bering 

 Strait tend to deform the tidal curve, depressing or 

 enlarging the oscillations and the daily tidal periods. 

 A maximum variation in sea level from low low water 

 to high high water of 51 inches was observed during 

 the July-September recording period. 



Figure 17. Offshore tide recording station, Wales, Alaska. 



18 



