Furthermore, as earlier, we derive 



L 



N_ 

 1 



(8) 



1 



N 



ION 



(//n 



■H) 



Let us assume that the initial thickness of the ice is fl^ = 15 cm; the average thickness of the 

 ice which is not hummocked by the given wind is fl^max ~ ^^ °'^* ^^ '^^ clear that the field stops 

 being hummocked after its hummock becomes equal to 10 points. Substituting these values in for- 

 mula (8) we derive K = 0.3. 



However, the assumptions were approximated on the basis of which formulas (7) and (8) and 

 table 84 are derived; it results from them that the open areas of water wiU be created even with 

 small hummocking in the sea. A map of the position of the ice in the White Sea according to the 

 data of air reconnaissance which was carried out on 17 April 1942 (figure 104) appears as the 

 characteristic example. Such a situation has been created as a result of northwestern storms and 

 great areas of clear water in the Kandalakscha Gulf and along the Karelian shore and also along the 

 western shore of the funnel of the White Sea were formed exclusively as a result of hummocking. 



Figure 104. The position of the ice in the White Sea, 

 17 through 18 April 1942. 



It is clear that open patches of water being cleared, sometimes at one shore and sometimes 

 at another, and that evacuation of ice will create the possibility even of sea navigation in the dead 

 of winter. But on the other hand, increased ice formation occurs in open spaces of water with 

 strong freezing and in such a way, that the total power of the ice increases in the course of time. 



LITERATURE: 77. 



288 



