Tool NameWind Effect (Windward / Leeward Index)
Tool ID15
Library IDta_morphometry
Version1.0
Author(s)J.Böhner, A.Ringeler (c) 2008, O.Conrad (c) 2011

Please cite SAGA whenever you use it for your publications:

doi:10.5194/gmd-8-1991-2015

Description

The 'Wind Effect' is a dimensionless index. Values below 1 indicate wind shadowed areas whereas values above 1 indicate areas exposed to wind, all with regard to the specified wind direction. Wind direction, i.e. the direction into which the wind blows, might be either constant or variying in space, if a wind direction grid is supplied.

Parameters

NameTypeIdentifierDescriptionConstraints
Input
Elevationgrid, inputDEM
Wind Directiongrid, input, optionalDIRDirection into which the wind blows, starting with 0 for North and increasing clockwise.
Wind Speedgrid, input, optionalLEN
Output
Wind Effectgrid, outputEFFECT
Effective Air Flow Heightsgrid, output, optionalAFH
Options
Wind Direction UnitschoiceDIR_UNITSAvailable Choices:
[0] radians
[1] degree
Default: 0
Scalingfloating point numberLEN_SCALEDefault: 1
Search Distance [km]floating point numberMAXDISTMinimum: 0.000000
Default: 300
Constant Wind Directionfloating point numberDIR_CONSTconstant direction into the wind blows, given as degreeDefault: 135
Old VersionbooleanOLDVERuse old version for constant wind direction (no acceleration and averaging option)Default: 0
Accelerationfloating point numberACCELMinimum: 1.000000
Default: 1.5
Elevation AveragingbooleanPYRAMIDSuse more averaged elevations when looking at increasing distancesDefault: 0