Figure 20. A contour plot showing flow direction (° from North) at depth (m) and time (minutes from 0840 UTC) intervals at the King Harry Ferry Pontoon in the Fal Estuary, measured using a current meter.
Figure 21. A contour plot showing flow speed (m/s) at depth (m) and time (minutes from 0840 UTC) intervals at the King Harry Ferry Pontoon in the Fal Estuary, measured using a current meter.
Over the course of the 3 hour time period the general direction of flow was southward, driven by the ebb tide currents. This can be seen in figure 20 where the contour map values are dominated by values between 160 to 200° from North. The exception to this occurs in the first 1m depth between 70 and 120 minutes where a change in direction occurs to an Eastward direction. Flow speed is highest in the middle depths of the estuary, around 2 to 3m which can been seen on the contour map in figure 21. Flow speed is slightly slower in the surface layers and the boundary layer near the sediment. There is an increase in flow speed at the surface between 30 and 60 minutes where it reaches 0.35m/s, compared to 0.20 to 0.05m/s observed for the rest of the time series.
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