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River Groins



Experimental investigation on the:


Influence of Dead zones on

Mass Transport Processes in Natural Rivers

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River groins viewed from a bridge.

Time-average streamlines and
RMS-velocities between two groins in the laboratory.

To get a better understanding of the influence of Groyne fields on the longitudinal dispersion in rivers, detailed velocity measurements (
Surface PIV (0.4MB), see figure on left hand side) and concentration measurements (1.8MB) have been performed in a 20 m long and 2 m wide laboratory channel. Different experimental setups with changing groyne field length and varied inclination angle (0.4MB) were realized. It could be shown that a changing aspect ratio between width and length of a groyne field, has a significant influence on the mass exchange between main stream and dead zone. To obtain 1-D dispersion coefficients based on the experimental results at a single dead zone,  a Lagrangian-Particle-Tracking-Method (0.4MB) has been develloped. These coefficients are used in 1-D alarm models like the 'River Rhine Alarm Model'.   


Video of concentration measurements