Integrated River Management - River Dynamics and Integrated River Management - page 740

the stream network of the Yalutsangpu River. The shape of the drainage area looks like that of a plume
network and the drainage area increases with stream length almost linearly. Nevertheless, the stream
network has 275 first order streams, 70 second order streams, 17 third order streams, 5 fourth order
streams, and one fifth order stream. The bifurcation ratio is about 4, which means that the Yalutsangpu
River network must be a dentritic network rather a than plume network. In general, the drainage area of a
dentritic network is two dimensional. The Yalutsangpu River drainage area was two dimensional but was
changed to almost one dimensional because the Indian Plate thrust against the Eurasia Plate, which changed
the shape of the drainage area.
Fig. 11.25 (a) Stream network and drainage area of the Yalutsangbu River; (b) Conjectural drainage area of the
Yalutsangpu River basin millions of years ago