Geoscience Reference
In-Depth Information
Fig. 5 View of side channel spillway model for existing state (Change I)
At present, the operation of outlet installation is carried out until a damming level
in reservoir will reach dam crest, that is, the outflow will be somewhat over
100 m
3
s
1
.
In view of the above-mentioned requirements for exploitation safety of the
reservoir, the side channel spillway applying the proposed solutions of reconstruction
was modeled.
5 Model Investigations
The model investigations were carried out for the whole outlet installations of
reservoir (Machajski
2009
). First, the aim of model investigations was to verify a
proposed reconstruction of a side channel spillway. The program of investigation
consisted of measurements and observations for determining:
- Capacity ability of side channel spillway, in terms of the changes of levels of
damming up in the reservoir ranging from 309.30 m asl to dam crest from
upstream equal to 312.00 m asl
- Operating conditions of multistage cascade during greater discharge passage
- Operating conditions of arch bridge at passage section from flume to multistage
cascade
- Impact of spillway constructional changes, introduced in minimal range -
possible to be comparatively easily realized
The investigations, carried out on a spatial model at scale 1:40, included all
component elements important for water passage in this side channel spillway with
multistage cascade (Machajski
2009
). For the studied problem, the water over weir
crest and in a flume flows predominantly due to gravity force; therefore, the Froude
