Geoscience Reference
In-Depth Information
Fig. 1 Bielkowo hydropower plant hydrotechnical system
area near the Kolbudy town. The total length of the embankment is about 1,560 m.
The dams are sealed with clay cores and covered using Ehlers-type hexagonal
concrete plates. Locally, the dikes reach the height of 7 m. The crest elevation is
87.50 m a.s.l. and maximal water level in reservoir is equal to 86.3 m a.s.l. The area
of the reservoir Kolbudy II is about 54 ha and the maximal depth is 9 m. There is no
information about reservoir bathymetry. The total volume of the reservoir Kolbudy
II is about 1.2
10
6
m
3
.
The water from the Kolbudy II reservoir is supplied to the Bielkowo hydropower
plant. The water intake is situated at the end of the reservoir, at the inflow section
formed with the embankments. The water is conveyed in the concrete tunnel of a
total length of 834 m and a diameter of 3.6 m. The tunnel is located underground. At
the end of the tunnel the surge tank is situated, that protects the pipeline against the
water hammer effect. Then the water is turned into the 166 m long steel penstock of
3 m diameter leading to the power plant. Bielkowo hydropower plant is equipped
with three Francis turbines of 2.4 MW and discharge 7.2 m
3
/s each. From the
turbines, the water flows to the tailrace channel and finally to the Radunia River.
The failure of the dam 1 (Fig.
1
) is considered in the chapter as an example of
numerical simulation of a catastrophic flood.
2 Digital Terrain Model (DTM) and Dam-Break Outflow
Hydrograph
The numerical simulation of the catastrophic flood is composed of several elements. At
the first step, the digital models of elevation (DEM) and land development must be
elaborated. The geodesic work was done by the Local Geodesy and Cartography
