Model tests for the spillway of the Straußfurt flood retention basin

© O. Just

Brief description

The Straußfurt flood retention basin (HRB) is an essential part of the functional flood protection for the middle and lower Unstrut as well as for parts of the Gera. The planned repair and expansion of the basin forms a central component of the Unstrut flood protection concept. With the planned raising of the reservoir level by 1.0 m, the normal flood retention area is to be increased by around 10 million m³, which will improve the flood protection effect of the basin in the long term. An important part of the project is the spillway. As part of the in-depth review of the dam, hydraulic model tests were carried out at the Schleusingen Hydrolabor (IWSÖ GmbH) in 2017, in which the hydraulic capabilities of the HWE's current state were examined. This also revealed various hydraulic limitations, such as backwater phenomena, insufficient energy conversion and unfavorable flow conditions in the stilling basin. These findings underlined the need for hydraulic optimization of the plant. Based on the identified deficits and as a result of the planned increase in the reservoir target, various measures to improve the hydraulic efficiency were developed during the preliminary planning phase. In this context, the overflow sill of the HWE will be raised by 1.0 m and will receive a new, hydraulically optimized overflow profile as part of the measure. Further structural adjustments concern the redesign of the stilling basin.

Physical model tests on a scale of 1:20 were carried out at the Institute of Hydraulic Engineering and Technical Hydromechanics (IWD) at TU Dresden to test and further develop the proposed technical solutions. The tests were carried out in the Hubert Engels Laboratory and were divided into two test series:

• Test series 1: Investigation of the planned condition and derivation of further optimization measures,
• Test series 2: Investigation of the optimization status.

The results of both test series were documented and evaluated in detail. The focus was on the investigations into the hydraulic capabilities of the HWE and the energy conversion in the stilling basin. The effectiveness of the optimization measures developed as part of the model tests was also discussed in detail.

Under the following link you will find a project video of the Thüringer Fernwasserversorgung for the expansion and repair of the HRB Straußfurt with valuable insights into the model tests carried out: https: //www.youtube.com/watch?v=Zf6Ipv8siFU&t=1s

Media

Project data

Project management

© Andrè Terpe

Professor

Name

Mr Prof. Dr.-Ing. Jürgen Stamm

Head of Inst., Chair Hyd. Eng. & School of Civ. & Environ. Eng.

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Organization Name

Office of the Chair of Hydraulic Engineering

Office of the Chair of Hydraulic Engineering

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Visiting address:

Beyer-Bau, Room 04-22 George-Bähr-Str. 1

01069 Dresden

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Project management

Research Associate

Name

Mr Dr.-Ing. Ulf Helbig

Head of Hubert Engels Laboratory

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Office of the Chair of Hydraulic Engineering

Office of the Chair of Hydraulic Engineering

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Beyer-Bau, Room 04-023 George-Bähr-Str. 1

01069 Dresden

https://orcid.org/0000-0002-8659-9100

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© André Terpe

Research Associate

Name

Mr Dipl.-Ing. Manuel Wewer

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Organization Name

Office of the Chair of Hydraulic Engineering

Office of the Chair of Hydraulic Engineering

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Beyer-Bau, Room 04-24 George-Bähr-Str. 1

01069 Dresden

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Project partners