

































































































V' 

















/" 





r<0- 



















<-f 







y o 







z^»" 



y 



Vi 



















A 



* 





6 V I 



//,'" 1 v^ 







' 





















A 



SA.<b 





K* 

































( , 













SNOW DEPTH 8 ■ 



WIND VELOCtTY \' 1 mL/h 































































Aid TEMP. T =-20»C 

































EOUIV. TEMP. 8 =-IS'C 

































FREEZING TEMP 































































INITIAL ICE 

































THICKNESS > 1 5 cm. 

































LAYER DEPTH 



■ 100 ro. 































































































8 12 16 20 24 28 32 36 40 44 48 52 

 TOTAL TIME (DAYS) 



60 64 68 72 76 80 84 



FIG.ll. EFFECT OF WATER TEMPERATURE ON THE GROWTH OF ICE 



SNOW DEPTH 



. WIND VELOCITY V = 10 mi/hr 

 EQUIVALENT TEMP. 9=-25"C 

 AIR TEMP. T r -20°C 

 FREEZING TEMP Tx=-l.8°C 

 MEAN TEMP. OF CONVECTIVE 



-LAYER T, = 0. 5"C 



ICE GROWTH A£ ' 



f| * INITIAL ICE THICKNESS 



H = THICKNESS OF CONVEC- 

 TIVE LAYER 



T = TIME ADDED BY HEAT OF 

 LAYER 



60 70 30 



CONVECTIVE DEPTH, (H),( METERS) 



FIG.12- EFFECT OF THICKNESS OF MIXED LAYER ON GROWTH 

 OF ICE. 



22 



