for each direction of the vdnd as vactors. From the construction we 

 can jufi^e imnadiately the influence of any single direction of the 

 wind on the material drift, 



n3 shall now show the formula can be used in practical cases. 

 In the follov^-ing table is given the strength and frequency of the 

 wind at 17 stations in Den^iark. These figures are the averages result- 

 ing from daily wind observations over a period of 5 years. It will 

 be noted that winds from northwest increase from Grenen and south, 

 while the ivinds from the west and soathsfest decrease in the south. 



From these data, the natarial-raoving power has been computed for 

 4-3 locations on tte Danish coast, of which 22 locations are on the 

 west coast of Jutland, 8 on the east coast^ 3 on the north coast of 

 Sjaelland^ and 10 on the Baltic coasts of SJaelland, H^en, Falster, 

 Lolland and Bornholm. Fig-a.re 7 shows all the vector-polygons and 

 the resulting material-moving powers, including their components ^ 

 perpendicular to (eroding) or parallel to (material drifting) the 

 coast. The diagrams are drawn to the same scale and one can see that 

 the powers on the west coast of Jutland, vrhich is exposed to the free 

 space to England, Scotland and partly also the Atlantic, are very 

 great in comparison to the powers within Skagen. Figure 8 shows the 

 material-moving power at the different locations as vectors (in size 

 and direction). Relatively strong headlands which are worth being 

 iTBnticned are Hirtshals (stonslike clay), Hanstholmen, Bulbjerg and 

 Lodbjerg (line), all on Jutland | on Sjaelland, Gilbjerg and 

 Spodsbjerg (stone like clay)| Stevns (lime and chalk) and yj^en 

 (chalk), on Bornholm granite, sandstone, and stone-like clay (RjzJnne). 



On Figure 8 it can be noted that material transport on the west 

 coast of Jutland is mostly towards the south from Lodbjerg to Blaavands 

 Hukj farther south the influence of the tides is so strong that these 

 coasts cannot be treated in this paper. From Lodbjerg north, nearly - 

 Trithout interruption, the material-drift moves north up to Grenen. 

 Thus J material must pass by Hirtshals and Hanstholmen, and these will 

 'Consequently remain points free of sand and with steep slopes until 

 the sand is prevented from passing, Grenen, (Figure 9) which has as 

 we know an east-west direction, is a relatively stable terminal in 

 spite of being made of soft material (sand, gravel and small stones) 

 as there is a certain balance between arrival and departure of 

 material. On the Skagerak side the material is moved to the point 

 from the west, while winds from northeast and east move it down along 

 the Kattegat coast where it is stopped partly by Skagen harbor. The 

 point (Grenen), however, is not stable but moves slowly northward and 

 then southward. The reason for this is variation in deposition and 

 erosion over a period of years. 



At Thybor^fn, Figure 10, the material-drift has caused severe 

 difficulties. Before 1825 there was no connection v/ith the ocean 

 in the west as the Limf jord was a fjord, but in this year the so- 

 called Agger channel was made. Forty years later this channel was 

 blocked by sand, but , before this happened, a new channel was cut 



10 



