sloplenFUN {soilassessment}

A function for estimating slope-length factor for soil erosion

Description

Th function estimates slope length factor for erosion risk assessment. It has options for choosing different algorithms

Usage

sloplenFUN(ls,slope,method)

Arguments

ls

length of slope in metres

slope

slope of land in degrees

method

method for deriving slope-length factor. The methods included are: WSmith, Renard, Remortel, Zhang, Nearing, Smith, Foster, David, Morgan, and Moore.

Details

Slope (degrees) and length of slope (metres) are relief parameters in erosion risk assessment.

Value

a dimensionless quantity of slope-length factor of erosion risk

Note

The slope must be in degrees. The warning given is a reminder to that the slope is given in degrees

Author(s)

Christian Thine Omuto

References

Benavidez R, Bethana J, Maxwell D, Norton K. 2018. A review of the (Revised) Universal Soil Loss Equation ((R)USLE): with a view to increasing its global applicability and improving soil loss estimates. Hydrol. Earth Syst. Sci., 22, 6059–6086

Omuto CT and Vargas R. 2009. Combining pedometrics, remote sensing and field observations for assessing soil loss in challenging drylands: a case study of northwestern Somalia. Land Degrad. Develop. 20: 101–115

See Also

erosivFUN, erodFUN, slopeSuit

Examples

library(sp)
sloplenFUN(60,14.88,"Renard")
newmap=suitabinput["slope"]
newmap$LSrenard=sloplenFUN(60,(newmap$slope),"Renard")
newmap$LSwsmith=sloplenFUN(60,(newmap$slope),"WSmith")
spplot(newmap["LSrenard"])
spplot(newmap["LSwsmith"])