Figure 6 . Transient evolution of the trunk profile (a & c)
and network of tributaries (b & d) in Case 4 (spatially uniform to
top-heavy) throughksn -Eavg (a & b) andksn-q -Eavg (c & d)
parameter spaces; figure layout is same as Figure 5. Like Case 3, the
trunk response is muted relative to the network of tributaries, but the
disparity is more extreme in this case. Star in panel (a) shows Kcalculated from equation (1b) based on the final mean rainfall of 1 m/yr
(K = Kp ) at steady state, which
corresponds to a predicted mean ksn of
~450. Again, note offset between this value and range of
erosional efficiency and ksn values exhibited at
t6.