Figure 21 shows the vector-polygons for the area. Dotted lines 

 are found in sorre of the poly3;ons. This is done since the sea off 

 Latvia is froaen at some places during part of the year and then no 

 material drift occurs. 



Conditions around the fishing harbor of Pape are intaresting. 

 figure 22.) Initially it was thought that th& littoral mov3?rent , 

 here as well as on the rest of the coast, was toward the north and 

 consequently there was built a jetty on the south side of the ei-.it 

 to the Pape Sea. .As the material movement is in fact tovrard the 

 south J the jetty turned out to be a fence that gathered material in 

 the exito Later a je bt j- had to be built to the north. If vector- 

 polyons had been constructed before ths southern jetty was built, 

 the mistake probably could h?ive been avoided. 



Figure 23 shows the harbor of I,ibaus (Terman Lienaja), which at 

 one time was the most important naval harbor of the Russi'-ns and 

 its dimensions had therefore to be great. The velocity of the wind 

 here is greater than at other places on the coast, and durin?' rales 

 a content of 3% sand in the water has been measured. The littoral 

 drift is slightj but as the vector-polygon shows the bottoi erosion 

 is great e 



The conditions at ffindau are more Jifficult (Figure 2/h). The 

 vector-polygon shows that the direction of the material-moving power 

 is very oblique^ and as a result a very strong one-sided deposition 

 occurs. The conditions remind one very strongly of the harbor of 

 fiilleleije, but they are much greater in magnitude. The coast line 

 has moved seav^ard about 700 meters and there is now about 3 meters 

 of high dry land where there was ^ meters deep vrater before . '."ind- 

 vrard of the head of the jetty there is a sand bank and 200,000 

 cubic rreters are deposited annuallj^- in the exit. 



Figure 25 shows the point and the sandbank at Kolkasrags. The 

 vector-polygon shows a strong sand drift toward the point on the 

 west side J whereas on the esst side there seems to be a balance 

 between the material drift in the two directions. Two surveys ol' the 

 sandbanks, made 10 years apart, shew that an average of 50,000 cubic 

 meters of sand is deposited annually. This sand comes from the south. 

 From this we can compute the constant, c, in the formula. As the 

 projection of the material-moving power on the coast line is 7.4-, we 



c = 50000 = 6300 

 7.4 



If we now go back to iVindau where the projection is measured at I'^.O 

 the li>.toral drift from the south should be: 



18.0 X 6800 = 132000 cubic meters 

 which corresconds quite well T'ith the fact that each year about 



15 



