watem_ktc: Transport capacity coefficient

In atsyplenkov/rusleR: Universal Soil Loss Equation Estimation

Transport capacity coefficient

Description

Calculates K_{TC} from WATEM/SEDEM (Van Oost et al., 2000). It is a land-use-dependent transport capacity coefficient (m). The transport capacity is the maximum sediment mass that can be transported by the overland flow. If the sediment production is higher than this transport capacity, sediment will be deposited. Thus, the higher the transport capacity coefficient, the more sediment can be transported downslope (Van Oost et al., 2000).

Usage

watem_ktc(
  .c_factor,
  .ktc_low = 75,
  .ktc_high = 250,
  .c_max = 0.1,
  .seed = 1234
)

Arguments

.c_factor	SpatRaster. It is a cover management factor (dimensionless)
.ktc_low	Numeric. The lower limit of possible K_{TC}
.ktc_high	Numeric. The upper limit of K_{TC}
.c_max	Numeric. A threshold C-factor value needs to be given to indicate for which areas the high K_{TC} needs to be used. Usually, roads are given a very high K_{TC} such that no sediment deposition is modelled on road surfaces. The default is 0.1.
.seed	Numeric.

Details

The K_{TC} usually requires calibration (cf. Batista et al., 2022). Here we used an approach suggested in Batista et al. (2022). K_{TC} value is sampled from an uniform distribution using the runif function.

Value

SpatRaster

References

Batista PVG, Fiener P, Scheper S, Alewell C. 2022. A conceptual-model-based sediment connectivity assessment for patchy agricultural catchments. Hydrology and Earth System Sciences 26 : 3753–3770. DOI: 10.5194/hess-26-3753-2022

Van Oost K, Govers G, Desmet P. 2000. Evaluating the effects of changes in landscape structure on soil erosion by water and tillage. Landscape Ecology 15 : 577–589. DOI: 10.1023/A:1008198215674

atsyplenkov/rusleR documentation built on Feb. 24, 2023, 9:04 a.m.