134 
Dt. hyclrogr. Z. 44, 1991/92. H. 3. Klein el al., Ciments; German Bight 
During both experiments wc deployed U-type moorings with Aanclcraa current meters 
with a sampling rule of 2 minutes. A bottom-mounted 300 kHz RDI acoustic doppler cument 
profiler (ADCP) was deployed for periods up to 36 hours at different positions. Near-bottom 
currents (30 cm above the bottom) were measured with an acoustic Neil Brown current meter 
with I minute sampling rate, mounted to a bottom-frame called "Rhonrad". All deployment 
positions are shown in fig. I. 
Fig. 1 TOPEX area and deployment positions. Thin numbers are depth in metres, the ridge is 
schematically outlined by the 20 m-isobath. K’sand L’s mark TOPEX-1 moorings, R is the position 
of the „Rohnrad”. I to 8 (bold numbers) are TOPEX-11 moorings, A1 and A2 are the positions of 
the TOPEX-11 ADCP-measurerncnts. Tidal curents have been calculated for position B. 
General map: HG: Helgoland, W: Wave rider buoy.