HYDRAULIC PERFORMANCE ASSESSMENT OF SPILLWAY NO 2 AT BOGUCHANSKY HYDROPOWER PLANT (RUSSIA) DURING THE CONSTRUCTION STAGE

N.V. KHANOV, M.M. ABIDOV, V.A. FARTUKOV, M.I. ZBOROVSKAYA, D.A. ALEKSEEV

Abstract


This study presents a comprehensive hydraulic assessment of Spillway No 2 at the Boguchansky Hydroelectric Power Plant (Russia Federation), focusing on its operational performance during the construction period when incomplete structures may lead to atypical and potentially hazardous flow conditions. The investigation analyses the behaviour of river discharges through the spillway under both free overflow and pressurized flow regimes, employing theoretical formulations and hydraulic design standards to evaluate flow parameters, energy dissipation capacity, and jet formation characteristics.
Emphasis is placed on determining the conjugate depths of the hydraulic jump, Froude numbers, velocities, and discharge coefficients under varying reservoir levels and gate opening configurations. Particular attention is given to the limitations of the existing stilling basin, where calculations reveal that its current dimensions may be insufficient to contain the jump under pressure discharge conditions. The study further quantifies the trajectory, depth, and velocity of the high-energy jet that forms when the hydraulic jump cannot be fully stabilized, highlighting the risk of downstream erosion and structural impact.
Recommendations include the elevation of side walls to contain jet dispersal, reinforcement of downstream protection works, and consideration of energy dissipation measures adapted to transitional operation stages. The findings offer critical guidance for the design and temporary operation of hydraulic structures during phased development and contribute broadly to the safety assessment of large-scale hydropower installations.


Keywords


Hydraulic Constructions, Hydraulic Structures, Stilling Basin, Energy Dissipation, Spillway, Velocity, Discharge, Hydraulic jump, Water jet trajectory, Boguchansky HPP.

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