It is also possible to determine volume transport per unit 

 width if the depth of the water is known and the distance from 

 SM to Fl is determined. 



Procedures 



During the 1973 iceberg season two field experiments with 

 the expendable surface current probe were conducted. An IIP 

 C-130 aircraft equipped with a CA14 aerial camera and inertial 

 navigation system (INS) was made available on an opportunity- 

 only basis. The field test procedures consisted of selecting 

 a "young", plateau type iceberg which is not grounded and is 

 in an area where the water depth is not greater than 1000 

 meters (as indicated on bathymetric chart) . The position of 

 the selected iceberg was recorded from the INS. 



A figure eight flight maneuver with the iceberg at the 

 intersection (Figure 2) served as an efficient deployment 

 pattern. The preferred ground speed and altitude of the air- 

 craft during deployment were 150 knots and 1000 feet 

 respectively. 



The measurement technique is based on the release of floats 

 containing dye at predetermined time intervals. The probe 

 containing three floats, timer, and parachute is dropped from 

 the aircraft into the water. The first float is released on 

 the surface. The appearance at the water surface of the 

 remaining two floats is dependent on the actual water depth 

 and the preset time. The aircraft time on station is directly 

 related to the actual water depth where the drop occurs. For 

 example, if the water depth is 500 meters, the on-station 

 time would be not less than 25 minutes. The total time on 

 station included deployment of four current probes as in 

 Figure 2, the photography run, and dye marking of the iceberg. 

 Dye marking the iceberg assists in identification of the ice- 

 berg on succeeding tests. 



The primary data recorder for this experiment was the CA14 

 aerial camera. The flight pattern for the photography runs 

 was similar to that of the launch pattern (as indicated in 

 Figure 2), so that film sequencing would be in proper order 

 for interpretation. After the launch, the oceanographer was 

 to assist'with the sighting of the floats and the completion 

 of a Surface Current Data sheet. The Surface Current Data sheet 

 provides the parameters to interpret and analyze the nhotoeraohy. 



B-2 



