Tlu' ]);ir;ieliiite drogue iiK'asureineiUs consisted of simultaneoiis 

 radar tracking of tln'ee drogues relative to the iceberg. The drogues 

 were pkiced approximately at the surface, at 250 feet, and at 500 feet. 

 Each was suspended from a float consisting of a styrofoain float 

 pierced by a 20-foot aluminum spar equipped with a battery powered 

 flasliiug light and radar reflector. Unfortunately, the radar reflectors 

 did not work as well as was expected and maximum radar range was 

 5 miles with occasional maximum ranges of less than 1 mile in choppy 

 seas. Nevertheless, successful observations were taken and data 

 recorded. At the present time it is felt that although some interesting 

 results were obtained, the amount of data is insufficient to present a 

 conclusive result. It is hoped that further studies can be nuide and 

 more definite conclusions reached. 



With reasonable assumptions regarding above water and l)elow 

 water areas and drag coefficients applied to theoretical hydrodynamical 

 arguments an expression for windage was derived as: 



Iceberg velocity = 0.023 wind. 



This was in good agreement with the preliminary data wtiicii indicate 

 that the relation between wind speed and the movement imparted to 

 an iceberg for wind speeds Ix'tween 10 and 50 knots is linear and given 

 by: Iceberg Vel. = 0.03K-W with the movement directed 50° to the 

 right of the surface wind." The "shape" constant, K, varies from 0.7 

 for blocky or massive bergs to 1.4 foi- drydock or winged icebergs, W 

 is the wind speed. As part of this investigation, a re-evaluation of 

 the constant in Ekman's equation for the velocity of wind driven 

 currents was accomplished by a rapid reduction of 77,S2S observations 

 made by lightships along the North American east coast. The value 

 (h'lived, 0.013, is in excellent agi'ccMiUMit with Ekman's. 



SUMMARY 



1. Precise chlorinity (k'terminations together with \^'enner salinity 

 bridge measurements of a collection of large samples of actual surface 

 sea water samples over the range of salinities encountered in the Ice 

 Patrol operating area has permittetl a good calil)ration of the salinity 

 bridge, an assessment of the errors involved in the use of several 

 batches of C'opeidiagen standard water as standards of conductivity, 

 and the determination of corrections to the previously ])ublisiu'd 

 salinities of samples collected by the Ice Patrol during tlie period 

 1948 to 1959. These corrections and other corrections to salinity- 

 dependent functions are tabulated. 



2. Five dynamic topogi'aphic charts I'esulting from the four surveys 

 made in the Grand Banks region during the season arul the postseason 

 occupation of the Bonavista triangle have been presented. 



' Budiiigt'i-. T. F. Wind Effect on Icebergs \9<,0. unpublished. 

 .-)917.59— 61 6 73 



