Model tests of the Straßberg flood retention basin

Blick vom Unterwasser auf das Absperrbauwerk im Wasserbaulabor

Short description

As part of the Selke flood action plan, the construction of an ecologically continuous, green flood retention basin is planned above the village of Straßberg. The approx. 65 km long Selke flows through the Harz and the eastern Harz foreland. In the future, the Selke valley will be blocked by a barrier structure with a crest length of 270 m and a height of 20 m at km 58+182. Physical model tests were carried out at the Institute of Hydraulic Engineering and Technical Hydromechanics (IWD) at the TU Dresden to ensure the hydraulic performance in the event of flooding. The physical Froude model (scale M 1:20) was set up in the Hubert-Engels-Laboratory of the TU Dresden and the following three test series (TS) were carried out:

In TS 1, the pre-optimized planned condition was investigated. The results of TS 1 led to structural optimizations.
In TS 2, the optimized state was investigated.
In TS 3, the performance characteristics of all operating facilities were created for the optimized state.

The barrier structure investigated is divided into a left-sided dam area and a right-sided combination structure in concrete construction. A solid wing wall forms the boundary between the combination structure and the dam. The combined structure contains the operational outlets, the spillway, the railroad culvert, the waterway culvert, the aeration system and the sluice gates. The reservoir is managed by two operational outlets which, together with the cascade of the spillway, flow into a stilling basin. The Selke is directed straight through the culvert, with a bed width of 1.0 m and lateral embankments. An accessible berm ensures the passage of terrestrial animals.

The hydraulic model tests for the Straßberg flood retention basin project were carried out to continue the planning and to optimize the facility components.

Media

Blick vom Unterwasser auf das Hochwasserrückhaltebecken Straßberg mit eingezeichneter Selke als graphische Darstellung — Blick vom Unterwasser auf das HRB Straßberg mit eingezeichneter Selke © Talsperrenbetrieb Sachsen-Anhalt

Geländemodellierung des physikalischen Modells im Wasserbaulabor — Geländemodellierung des physikalischen Modells © Manuel Wewer

Strömungsbild im Unterwasser des Absperrbauwerks bei Bemessungshochwasserzufluss 1 im Wasserbaulabor — Strömungsbild im Unterwasser des Absperrbauwerks bei Bemessungshochwasserzufluss 1 (BHQ 1) © Manuel Wewer

Strömungsbild auf der Kaskade der Hochwasserentlastungsanlage bei Bemessungshochwasserzufluss 2 im Wasserbaulabor — Strömungsbild auf der Kaskade der Hochwasserentlastungsanlage bei Bemessungshochwasserzufluss 2 (BHQ 2) © Manuel Wewer

Project data

Core information
Period	01/12/2022- 31/05/2024
Type of funding	Third-party
Fundgiver	Reservoir operation Saxony-Anhalt
TUD Research Priority Areas (RPAs)	Energy, Mobility and Environment › Water Research
Sustainable Development Goals (SDGs)	SDG 11 - Sustainable cities and communities SDG 13 - Climate action
Keywords	Flood management, flood protection, optimization of spillways