Proposal for the reconstruction of asphalt lining and drainage system of the upper reservoir of the Dlouhé Stráně Pumped Storage Hydropower Plant

Proposal for the reconstruction of asphalt lining and drainage system of the upper reservoir of the Dlouhé Stráně Pumped Storage Hydropower Plant

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The Dlouhé Stráně Pumped Storage Hydropower Plant is located in the Jeseníky Mountains in the north Bohemia, close to the Polish border. During the last decades, the asphalt-concrete lining has suffered from extensive blister-like defects. These defects appear as small craters with diameters of up to 30 mm. Due to their increasing number, a complete repair of the asphalt concrete lining of the upper reservoir was carried out in 2007. However, four years later, during the summer of 2011, the defects reappeared and have been repaired annually ever since. In addition, the defects were also identified in the drainage system of the upper reservoir. While the existing drainage system below the reservoir bottom provides functionality in water drainage, it does not fully meet the requirements for effective leak detection and long-term seepage regime monitoring. Based on these findings, a reconstruction of the asphaltic lining and drainage system is being planned after the year 2030. In this study, three possible variants of the drainage system are discussed. The most efficient variant was chosen. It includes the construction of a drainage gallery along the toe of the upstream slope, encircling its entire perimeter. The asphalt concrete lining reconstruction will involve the partial removal of existing layers and their replacement with new asphalt concrete layers designed to improve long-term durability and resistance, and to eliminate the local defects in the future.

The Dlouhé Stráně Pumped Storage Hydropower Plant is located in the Jeseníky Mountains in the north Bohemia, close to the Polish border. During the last decades, the asphalt-concrete lining has suffered from extensive blister-like defects. These defects appear as small craters with diameters of up to 30 mm. Due to their increasing number, a complete repair of the asphalt concrete lining of the upper reservoir was carried out in 2007. However, four years later, during the summer of 2011, the defects reappeared and have been repaired annually ever since. In addition, the defects were also identified in the drainage system of the upper reservoir. While the existing drainage system below the reservoir bottom provides functionality in water drainage, it does not fully meet the requirements for effective leak detection and long-term seepage regime monitoring. Based on these findings, a reconstruction of the asphaltic lining and drainage system is being planned after the year 2030. In this study, three possible variants of the drainage system are discussed. The most efficient variant was chosen. It includes the construction of a drainage gallery along the toe of the upstream slope, encircling its entire perimeter. The asphalt concrete lining reconstruction will involve the partial removal of existing layers and their replacement with new asphalt concrete layers designed to improve long-term durability and resistance, and to eliminate the local defects in the future.

pumped storage power plant, upper reservoir, asphalt-concrete lining, blisters, drainage system

pumped storage power plant, upper reservoir, asphalt-concrete lining, blisters, drainage system

CHRÁSTOVÁ, V.; ŘÍHA, J.; VYKYDAL, V.

05.09.2025

Wydawnictwo Czasopism i Książek Technicznych SIGMA-NOT Spółka z o.o.

Warszawa

978-83-64979-55-2

XXI Technical Dam Control International Conference "Challenges in Hydraulic Engineering" Book of Abstracts

1

0017-2448

Gospodarka wodna

1

2025-9

Polská republika

20

27

32

https://sigma-not.pl/publikacja-155812-proposal-for-the-reconstruction-of-asphalt-lining-and-drainage-system-of-the-upper-reservoir-of-the-dlouh%C3%A9-str%C3%A1n%C4%9B-pumped-storage-hydropower-plant-gospodarka-wodna-2025-9.html