Author(s): S. Haufe; J. Stamm

Linked Author(s): Jürgen Stamm

Keywords: Ecological Culvert; River continuity; Depression shaped stilling basin; Flood retention basin

Abstract: River continuity is a main objective of the EU Water Framework Directive (WFD). Therefore, flood retention basins (FRB) located in the main channel have to include a full ecological passage in the dam structure. Animals of all species should be able to pass through at any time. Conventional hydraulically optimized constructions have to be adjusted to meet this requirement. During the last two decades the design of the outlet structure and the configuration of the pass channel were the focus of research in Germany to form an ecological culvert at FRB. The separation of the ecological culvert and the bottom outlet enlarges the necessary building area and the massive construction in an earth fill dam. A combined culvert effectuates that ecological requirements have to be applied to the stilling basin as well. The depression shaped stilling basin (DSSB) with its continuous river bed slope raises the expectation to meet these requirements. However, a lack of knowledge in design standards of DSSB leads to uncertainty in the planning and approval process. The aim of the research is to advance the design standards of DSSB by taking both hydraulic and ecological requirements into account. In a first step, decisive parameters are identified. Their value ranges are specified based on a literature search. The combination of parameters and the resulting dependencies are currently analysed at the Institute of Hydraulic Engineering and Technical Hydromechanics (IWD in Dresden). This paper presents the approach of analysing the conflicting influences of low water and flood water discharge on the length of the DSSB.

DOI: https://doi.org/10.15142/T30H1W

Year: 2018