HorizontalV: calculation of mean velocities in verticals of cross-section...

In houbysvoctem/StreamDischarge: Evaluation of hydrometric measurement.

Description

The function calculates mean velocities in verticals of cross-section. Input data are originaly inteded for measurement of point velocity hydrometric measurement with FlowTracker HandHeld ADV, but if the data is provided in a right format, they can be from measurement with any other point velocity tool. Output is data.table with depths of verticals in [m] and mean velocities in verticals in [m*s^(-1)].

Usage

HorizontalV(data)

Arguments

data

Data must be in format: data.frame. In data there must be columns: Loc, Depth, MeasD, Vel. Means: Loc - "x" location of point from the bank of the stream [meters], Depth - depth of vertical of measured point [meters], MeasD - depth of measured point in vertical [meters], Vel - measured point velocity [m*s^(-1)]. Measured verticals must be in order from the lowest value of "x" location to highest "x" location or from the highest value of "x" location to the lowest value of "x" location.

Details

Number of points in vertical can be from 1 to 6. Used equations are:

1 point – velocity of vertical = v1

2 points – velocity of vertical = 0,5*(v(0,2) + v(0,8))

3 points – velocity of vertical = 0.25*(v(0,2) + 2*v(0,4) + v(0,8))

4 points – velocity of vertical = 0.2*(v(0,2) + v(0,4) + 2*v(0,6) + v(0,8))

5 points – velocity of vertical = 0.1*(v(bottom) + 2*v(0,2) + 3*v(0,4) + 3*v(0,8) + v(top))

6 points – velocity of vertical = 0.1*(v(bottom) + 2*v(0,2) + 2*v(0,4) + 2*v(0,6) + 2*v(0,8) + v(top))

Author(s)

Eliska Friedlova (Hasnikova)

References

technical norm ISO 748

See Also

This function is used in functions SvisP, MeziSvisP.

Examples

Velocities = HorizontalV(my_data)

houbysvoctem/StreamDischarge documentation built on May 9, 2019, 7:33 p.m.