APPENDIX A 



PROFILE CHANGES BETWEEN OCTOBER 1973 AND DECEMBER 1974 



Because of the more reliable surveying procedures used, a detailed anal- 

 ysis of the data collected during the final study period (October 1973 to 

 December 1974) was possible. Cumulative changes were computed for beach and 

 bluff positions and volume changes for each profile line. The datum used 

 (176.88 meters, IGLD) was equal to the average monthly lake level for the 

 period. Though the elevation of the beach varied from profile line to profile 

 line, a constant upper elevation of 1.25 meters above datum was selected to 

 facilitate volume computations. To ensure that only bluff face volume changes 

 were being computed, volume computations were terminated at an elevation of 

 13.75 meters above the datum. All active bluff crests were lower than this 

 value. 



Total volume and shoreline changes for the period are given in Table A-1 

 and plotted in Figure A-1. Average shoreline and volume change values were 

 greatly affected by the changes at profile line 16. During the period, the 

 shoreline of 9 of the 17 profile lines accreted an average of 2.2 meters while 

 the remaining 8 lines eroded 7.3 meters. Average beach volume loss was -2.0 

 cubic meters per meter but varied from 5.2 cubic meters per meter at profile 

 line 11 to -29.1 cubic meters per meter at profile line 16. 



Table A-1. Total shoreline and volume 

 changes: October 1973 to 

 December 1974.1 



Profile 



Shoreline 



Beach 



Bluff 



Total volume 



line 



change 

 (m) 



volume 

 (mVm) 



volume 

 (mVm) 



change 

 (mVm) 



1 



-1.4 



0.9 



2.4 



3.3 



2 



0.2 



1.6 



-9.5 



-7.9 



3 



-5.2 



-1.0 



-2.6 



-3.6 



4 



3.2 



4.7 



0.8 



5.5 



5 



2.1 



2.1 ■ 



-5.2 



-3.1 



6 



0.3 



-0.3 



-17.7 



-16.0 



7 



0.6 



2.1 



-1.1 



1.0 



8 



-13.2 



-9'. 6 



-25.8 



-35.4 



9 



1.4 



0.7 



-10.0 



-9.3 



10 



-3.8 



-6.1 



-10.3 



-16.4 



11 



6.1 



5.2 



2.8 



8.0 



12 



4.5 



2.8 



-2.7 



0.1 



13 



-4.3 



-4.7 



-8.8 



-13.5 



14 



-1.1 



1.1 



-6.2 



-5.1 



152 



-5.4 



-3.7 



-20.2 



-23.9 



16 



-24.3 



-29.1 



-43.6 



-72.7 



17 



1.5 



-0.4 



-0.7 



-1.1 



Mean 



-2.3 



-2.0 



-9.3 



-11.3 



Standard 

 deviation 



7.3 



8.0 



11.9 



19.4 



'Vertical datum equals 176.88 meters, 

 ^Actual period: December 1973 to Sep 



IGLD. 

 tember 1974. 



43 



