Time-average streamlines and
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
(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
(0.4MB) has been develloped.
These coefficients are used in 1-D alarm models like the 'River Rhine