Results of Investigations into the Winter Regimen of the Lower Pool of the Volga 22nd Party Congress Hydroelectric Station

Conclusions

• 1. The rise in water level_ΔH_{W 1} during freezing is affected by the meteorological conditions (air temperature), stream velocity, and filling of the channel during the period prior to stable ice formation. At the same time, the lower the air temperature the smaller is the effect of capacity of the river (within the limits considered) on the_ΔH_{W 1} and β_{b 1}, values (Fig. 2).

• 2. The relationships obtained provide a forecast of the_ΔH_{W 1} and β_{b 1} values, as a function of the anticipated air temperatures and planned station discharges.

• 3. When selecting limits to the winter performance of a hydroelectric station, it is necessary to take into account the meteorological situation during freezing of the river. If stable low temperatures are forecast, the restrictive requirements may be reduced in accordance with the curve (Fig. 2).

• 4. A sharp increase in the station discharges must be avoided if the edge of the ice is in the area of gaging station No. 1, in order to avoid the possibility of breakaway of the edge of the ice and the formation of artificial ice flows, resulting in blockages, and a rise in the level of the lower pool.