During the period of bottom sampling the rate of seaward flow of 
surface water in the Rudee Inlet gorge was 3.3 feet per second 
(110 cm./sec.). This was determined by timing the movement of filoures-— 
cein-dyed water over a 100-foot (30 m.) distance along the middle portion 
of the stone jetty on the south side (Figure 6) of the inlet. The central 
zone of outflow (Figure 7) from the inlet was also observed using floures- 
cein dye. Aithough neither was measured accurately, the velocity was 
observed to decrease and the mixing to increase as the outflow left the 
inlet and approached the fishing pier to the north (Figures 6 and 7). 
The dyed outflow could not be discerned north of the pier, as at that 
distance it had been well mixed with the surrounding water. 
Just prior to the sampling time, the average velocity of the long- 
shore current (inshore of the breaker zone) was determined at a point 
approximately 800 feet (240 m.) south of the inlet. This current was 
flowing in a northward direction at 0.76 foot per second (23 cm./sec.). 
A red dye (rhodamine B) was introduced into the longshore current just 
south of Rudee Inlet and was observed to flow northward. When the 
current came into the area of the outflow (dyed green) from the inlet, it 
was deflected seaward, and the longshore current itself deflected the 
inlet outflow. Just before reaching the fishing pier, both streams had 
become intermixed. 
The average height of breaking waves at sampling time was 0.75 foot 
(23 cm.) and the average wave period, as determined from a relay-type 
wave gage, was 6.5 seconds. Wave fronts made an angle (opening northward) 
of 29° with the shoreline at a point 1,000 feet (300 m.) from shore. Wind 
was from the southwest at 12 to 15 m.p.h. (19 to 24 k./hr.). The position 
of the breaker line has been plotted on Figures 7-20 from aerial photos 
made at sampling time by the U. S. Navy. 
LABORATORY MEASUREMENTS 
Determination of Sediment Parameters 
Each sand sample was analyzed for its:size-distribution curve using 
a Woods Hole Rapid Sand Analyzer (Whitney, 1960) with the procedure out- 
lined in Zeigler, Whitney, and Hayes (1960). Details of the methods, and 
assumptions involved in the analyses, are given by Harrison and Morales- 
Alamo (1964). The following descriptive measures of the resultant grain- 
size distributions were calculated: 
Mean Nominal Diameter, Mz = 1/3 (Pag + P59 + Pgo) 
Sorting, So = (Pgo - P20)/P50 
