Erosion and Sediment Transport: Finding Simplicity in a Complicated Erosion Model - Environmental Modelling: Finding Simplicity in Complexity - page 247

1 km 2 grid cell

(a) GIS data

Land use

Slope

Soil

Hilslopes from each grid cell

(b)

(c) WEPP model runs against 30yr climate time series

(d)

MIRSED matrix:
WEPP output
within multi-
dimensional
parameter space

(e)

Runoff adjustment from grid cell AAR

% Adjustment for
scenarios based on upper
uncertainty bounds

% Adjustment for
scenarios based on upper
uncertainty bounds

(f)

Soil erosion (kg mm − 1 m − 1 ) x runoff (mm)

Averaged response from hillslopes in grid cell
w i x i
w i

(g)

Σ
Σ

x w

=

(h)

5% quantile hillslope soil erosion t ha − 1 yr − 1 95% quantile hillslope soil erosion t ha − 1 yr − 1

50% quantile hillslope soil erosion t ha − 1 yr − 1

Validation against observed survey data

Figure 15.2 Schematic representation of the MIRSED approach to representing WEPP predictions in a simplified framework.