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Full text: Local currents at a shoreface-connected Ridge in the German Bight

142 
Dt. hydrogr. Z. 44. 1991/92. H. 3. K 1c in et al.. Currents; German Bight 
Additionally, the sediments are exposed to the lo-and-fro motion induced by surface waves. 
The maximum velocity of these oscillatory currents reach 37 cm/s at 20 m depth for a 6-second 
wave with a significant wave height of 2.3 nt — typical for this area. On January 25/26,' 1990, 
a wave rider buoy westwards off Sylt (see Fig. 1) recorded a significant wave height of 5 in 
and a period of about 9 s al a total depth of 19 m (Berger |199l|). The corresponding 
maximum orbital velocities at the bottom are about 150 cm/s. Regarding the offshore wind 
direction of the storm in the TOPEX area, the increase of sea stale is probably smaller, but 
wave-induced near-bottom orbital currents up to about 100 cm/s can be assumed. 
References 
Berger. R. 1991: Seegangsmessungen in der 
Deutschen Bucht im Jahre 1990. Meereskund- 
liche Beobachtungen und Ergebnisse Band 71, 
Bundesamt für Seeschiffahrt und Hydrogra 
phie, Hamburg, 73pp. 
DHI, 1988: Nautical cliarl No.89. Deutsches 
Hydrographisches Institut, Hamburg. 
Flemming, B . W. 1991; Zur holozänen Ent 
wicklung. Morphologie und faziellen Glie 
derung der oslfriesischen Insel Spiekeroog 
(südliche Nordsee), Senkenberg-Am-Mecr, 
Bericht 91/3, 51 pp. 
Kontur, P. D. 1976: The Transport of Cohe- 
sionless Sediments on Continental Shelves. 
ln: D. J. Stanley and D. J. P. Swift (Ed.): 
Marine Sediment Transport and Environmen 
tal Management. New York; Wiley & Sons. 
Nceman, V. 1990; Die Slunnflutcn im Januar 
und Februar 1990 an der Westküste von 
Schleswig-Holstein und in der Tideelbe. WSD 
Nord. Dezernat für Gewässerkunde, 24pp. 
Swift, D.J.P.,G. Parker, N. W. Lan- 
f re d i , G. Pe r i 11 o and K. F i g g e 1978: 
Shoreface-conneclcd Sand Ridges on Ameri 
can and European shelves: A comparison. 
Estuarine and Coastal Mar. Science 7, 257- 
273. 
Eingegangen am 18. März 1992 
Angenommen am 8. Mai 1992 
Anschrift der Verfasser: 
Holger Klein 
Dr. Ekkehard Mittelstaedl 
Bundesamt für Seeschiffahrt und Hydrographie, Bcrnhard-Nocht-StraBe 78, 2000 Hamburg 36
	        
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