Table 12. 



Reach A recession and process 



data used in 



linear regression 



model. 



Date 



Bluff recession 



Average 

 lake level 



Avg. rate 

 lake level 



Avg. high 1/4 

 lake levels 



Time period 

 onshore winds 



Period 

 length 



Estimated 

 ice cover 



Amount 



Rate 











change 





>26 kra/hr 









(m) 



(m/yr) 



(m) 



(nr/yr) 



Cm) 



(pet.) 



Cd) 



(d) 







B 



AL 



RL 



HL 



W 







19 Nov. 1970 





















2.15 



10.6 



176.48 



-0.12 



176.54 



16 



74 



74 



16 Apr. 1971 





















1.44 



2.5 



176.66 



0.05 



176.72 



3 



214 



— 



16 Nov. 1971 





















2.79 



12.9 



176.51 



-0.18 



176.57 



12 



79 



74 



17 Apr. 1972 





















3.22 



5.6 



176.75 



0.44 



176.84 



1 



211 



~ 



16 Nov. 1972 





















2.55 



18.6 



176.78 



-0.31 



176.81 



16 



50 



70 



20 Mar. 1973 





















2.58 



3.3 



176.97 



0.03 



177.06 



4 



245 



-- 



20 Nov. 1973 





















1.74 



5.2 



176.81 



0.32 



176.91 



7 



121 



60 



20 Hay 1974 





















1.91 



3.7 



176.94 



-0.43 



177.09 



5 



187 



— 



23 Nov. 1974 



















Correlation 







-0.41 



-0.39 



-0.49 



0.87 







coefficient' 



















'Correlation coefficient resulting from linear regression with the bluff recession rate as dependent 

 variable and independent variables. 



- 







y\ 





^^-^ 



'-^^^^ 



i^ - 



=;; 



^=»Y'=--. 



'-^^^ 



^ 



'^''' 



'^RU 





\ 



Figure 35. Variations in the variables (defined in Table 12) used in the regression 

 analysis. Actual monthly variations in period of onshore winds, lake 

 level, and rate of lake change are also shown. (Note: all lake level 

 values are plotted around the mean value from November 1970 to November 

 1974.) Vertical li'nes denote photo dates and ice periods. 



55 



