Damming the Naryn River channel at the Tashkumyr hydroelectric station: Fid-Bau Portal

Damming the Naryn River channel at the Tashkumyr hydroelectric station

Dokuchaev, S. M. / Kurakina, E. V. / Dubinchik, E. I.

Conclusions The experience of damming the mountain river Naryn at the site of the Tashkumyr hydrostation under conditions of a narrow rock canyon with an unusually high location of the inlet sill of the water outlet structure in the presence of considerable drops on the embankment, exceeding 10 m, permits making the following conclusions:Under the confined conditions of a complex mountain relief with a limited length of the damming stretch related to the layout of the structure hampering the organization of additional accesses to the river, the pioneer one-embankment method with dumping of the material into the water primarily from two banks is recommended as the main method for damming the channel of a mountain river. This method requires, in comparison with the two-embankment, smaller expenditures of means and times for preparation and conduction of works on damming and provides a reliable embankment even with unusually large drops.When reaching the maximum unit power of the flow in the gap it is quite effective to use an upstream hydro development (hydrostation) for reducing the discharges to minimum values. Temporary disconnection of the hydrostation for reducing the discharges being released and, as a consequence, reducing the volume of damming material and shortening the time of conducting damming works, as a rule, is always justified.Prototype investigations established that the method of laboratory investigations of damming in the presence of considerable drops on the embankment, just as for small drops, is completely reliable and allows with sufficient accuracy hydraulic substantiation and selection of a reliable and economical damming method with determination of the quantity of damming material.