Geoscience Reference
In-Depth Information
Fig. 4.
Slopes and computational meshes.
4. Results and Discussions
4.1.
Reproduction of the inundated area at the disaster
of 1999
Figure 5 shows the comparison between the actual inundated area and
the simulation result (more than 0.1 m water depth). From this figure, the
center part of the computational area has a good agreement between the
actual inundated area and the simulation result. But the inundated areas
of the western and eastern part of the computational area are not well
expressed by the simulation. The reasons of these disagreements are that
the rainfall spatial distribution is inappropriate and that drainage system
by the sewerage is not fully considered in this simulation.
Consequently, using this simulation model, suciently good results can
be obtained at least around the center part of the computational area.
4.2.
Effects of additional pump capacity on inundated area
From the above simulation results, three zones of A, B, and C are deter-
mined as shown in Fig. 6. Hypothetical construction of new pump stations
and extension of existing pump capacity, shown in Fig. 6, are assumed
here. The relationship between this additional pump capacity and inun-
dated areas of A, B, and C zones are individually computed and shown in
Figs. 7(a)-(c), respectively.
