GENERATING PLAN VIEW VECTORS

cetn-iv-23
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ERDC/CHL CETN IV-23

March 2000

represents velocity magnitude in ft/sec.1 The units for velocity magnitude depend on how the

data were processed. Often, velocity magnitude is represented in cm/sec.

Figure 1. Plan view contour of the total velocity magnitude from an ADCP survey in

the Columbia River

GENERATING PLAN VIEW VECTORS: HyPAS provides the capability of generating a

vector plot of magnitude and direction in plan view for the velocity data collected from the

Acoustic Doppler Current Profiler (ADCP) instrument. HyPAS will create a plot with vectors

pointing in the direction of flow and scaled in size by magnitude.

This tool allows the user to calculate the depth average of velocity magnitude and direction from

the entire water column or from a specific depth range. The user selects the survey data points to

plot by drawing a polygon around them. A depth range is specified. HyPAS then calculates and

plots the depth-averaged magnitude and direction for those survey points. Figure 2 is an

example of depth-averaged velocity magnitude and direction vectors from ADCP data at

Shinnecock Inlet, NY.

To obtain m/sec, multiply by 0.0348.