Figure 5 . Transient evolution of the trunk profile (a & c) and
network of tributaries (b & d) in Case 3 (spatially uniform to
bottom-heavy) throughksn -Eavg (a & b) andksn-q -Eavg (b & d)
parameter spaces. Layout of individual panels is like Figure 4. Six
representative time slices are shown; t1 shows time at
10 kyr model time (i.e., first timestep following change in rainfall),
t6 is at final steady state. Time intervals are not
equal in duration but t1-t6 are the same
timestep for all panels. Note range in ksn values
and erosional efficiency values spanned at final steady state in panels
(a) and (b). Also, note the relatively muted responses by the trunk
profile relative to the network of tributaries in bothksn and ksn-q . Star in
panel (a) shows expected erosional efficiency calculated from equation
(1b) based on the final mean rainfall of 2.68 m/yr
(2.68ยทKp ) at steady state, which corresponds to a
predicted mean ksn of ~275. Note
offset between this value and range of erosional efficiency andksn values exhibited at t6.