Figure 4 . Representative time slice of transient evolution for
Case 1 (uniform decrease in rainfall) and Case 2 (uniform increase in
rainfall) through (a)ksn -Eavg and (b)ksn-q -Eavg parameter
spaces. Case 1 is shown in red shaded domain (transient decrease in
erosion rate, E < U ), and Case 2 is in blue
shaded domain (transient increase in erosion rate, E> U ). Curves expressing the expected steady state
relationship between channel steepness and erosion rate with different
uniform erosional efficiencies are shown; K = Kp ,
is shown in black solid line, and grey lines show different values ofK as multiples of Kp . Vertical dashed
lines show percent deviations from steady state erosion rate. Initial
and final conditions shown with yellow circles, as labelled. Model data
from different positions along the trunk profile and individual
tributaries shown with red and blue data points, respectively. Trunk
data shown are only profile nodes at tributary junctions – all trunk
profile datapoints have a corresponding tributary datapoint at the same
position. Trunk profile data show upstream mean values from their
respective position, and tributary data show mean values for the
tributary profile measured at the junction with the trunk profile.