phi2phi {viadam}R Documentation

Deflecting angles in different coordinate systems

Description

Convert from a deflecting angle in a sloping coordinate system aligned with the terrain to deflecting angle in a horizontal projection.

Usage

 
phi2phi(phi,phih,psi)

Arguments

phi deflecting angle with respect to the direction of steepest decent in a sloping coordinate system aligned with the terrain.
phih deflecting angle with respect to the direction of steepest decent in the map plane, that is the angle between the horizontal projections of the avalanche direction and the dam axis.
psi the slope of the terrain.

Value

phi2phi returns a vector of angles with the same number of elements as phi, phih or psi.

Note

The arguments must be named so that the routine can differentiate between phi and phih.

The angles phi, phih and psiare given in radians.

In general, phi <= phih so that the deflecting angle in the map plane may be used as a conservative estimate of the deflecting angle for dam design.

Author(s)

Tomas Johannesson

See Also

vdamheight, sdamslope, damangle and phicontour.

Examples

## Not run: 
phi2phi(phi=25*pi/180,psi=10*pi/180)
## End(Not run)

[Package viadam version 1.0 Index]