Flow and sediment behaviour around an Xstream groyne
Data-driven and numerical analysis of hydrodynamic and morphodynamic behaviour in a river bend
E.J. Veraart (TU Delft - Civil Engineering & Geosciences)
Wim S.J. Uijttewaal – Mentor (TU Delft - Lab Hydraulic Engineering)
E Mosselman – Graduation committee member (TU Delft - Rivers, Ports, Waterways and Dredging Engineering)
B Reedijk – Graduation committee member (BAM Infraconsult)
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Abstract
This research investigates the hydrodynamic and morphodynamic behaviour around the Xstream groyne compared to traditional groynes. Implemented as a pilot in the IJssel River near Kampen, the Xstream groyne consists entirely of interlocking concrete blocks that creates a steep permeable structure with a 1:1 slope. Field measurements revealed unusual sedimentation behaviour, including the formation of a sediment ridge or “sediment line,” which differs from the scour-dominated patterns typically observed at traditional groynes. To explain this, multibeam, ADCP and float tracking measurements were analysed and a 3D CFD model in ANSYS Fluent was constructed. Results showed that the Xstream groyne produces weaker, elongated recirculation zones and redistributed erosion and deposition patterns. The sediment line forms in low-velocity zones influenced by a slow, counter-clockwise eddy, highlighting the dominant role of the groyne’s steep slope over its porosity. These findings demonstrate that the Xstream groyne fundamentally alters local flow and sediment regimes.