Geoscience Reference
In-Depth Information
Fig. 5 The flood zone after
t
¼
0.25 h,
t
¼
0.75 h and
t
¼
1.5 h
The results of flood simulation are presented in Fig.
5
. The pictures present the
flood range evolution and the water depth at the moments
t
¼
0.25 h,
t
¼
0.75 h
and
t
1.5 h after the reservoir dike collapse.
As it can be seen, after embankment breaking the water body is released from the
reservoir and the flood wave propagates in a horizontal plane. The flood expands
adequately to the embankment breach location and the relief of the floodplain. The
flood area is divided into four zones (shades of blue color), where depth is less than
1 m, in the range of 1-2 and 2-4 m, and greater than 4 m. Such depth zoning is
suggested by the Polish National Water Management Authority and can be directly
used for hazard zones identification.
After total simulation time
t
¼
¼
1.5 h the filling of the surface retention of flood
area is observed. At this time, the simulated flood wave front is reaching the
Radunia River valley and the Goszy´skie Lake being the reservoir of the Straszyn
hydropower plant - the next one in the Radunia cascade line.
