Closure of the Kama river at the site of the Lower Kama hydroelectric plant: Fid-Bau Portal

Closure of the Kama river at the site of the Lower Kama hydroelectric plant

Astafichev, V. I. / Neminskii, M. L. / Novatorov, S. V. / Korchits, K. V.

Conclusions Closure of the Kama at the site of the Lower Kama hydroelectric plant indicated the technical feasibility and economic expediency of use of the pioneer method in closing channels subject to scour with average velocities of up to 3.4 m/sec, and maximum velocities to 4 ra/sec at the point of the pervious core.The careful stabilization of a prone-to-scour channel should precede its closure. Under conditions approximating those during closure of the Kama, the width of the stabilized strip should be no less than 100 m, including not less than 30 m above the axis of the pervious core.The effective realization of the Kama closure under a flow of 3500 $ m^{3} $/sec by the pioneer method was ensured to a considerable degree by good preparation of the outlet run and preparation of the water-passing openings for closure of the channel in conformity with design.The width of the opening, the degree and time of preliminary breakup of the cofferdams, the schedule for channel constriction and hydraulicking of the dam, provision for conditions favorable to navigation, and a scheme for the regulation of discharges from reservoirs located upstream should be determined collectively with consideration given to the possibility of their subsequent adjustment in conformity with construction progress and the actual river conditions.