Geoscience Reference
In-Depth Information
Figure 11.18
Bed changes in Watts Bar Reservoir from 1961 to 1991 (Ziegler and Nisbet, 1995).
classes separated by size 0.062 mm were used in the simulation. The settling velocity
was determined using the Burban
et al
. formula (11.6) for the fine class and estimated
at5mm
s
−
1
for the coarse class. The deposition rate was computed using the Krone
formula and a non-cohesive model for the two size classes. The total erosion rate was
estimated using the Gailani
et al
. formula (11.21), and the fractional one was then
obtained by Eq. (11.45). The bed consolidation was simulated by a 3-D model. The
sediment loads in major tributaries in a 30-year period from 1961 to 1991 are shown
in Fig. 11.17, and the simulated bed changes in this period are presented in Fig. 11.18.
The simulation and measurement are in generally good agreement.
·
