Flow patterns around longitudinal training dams
B.W. van Linge (HKV Lijn in Water)
E Mosselman (Deltares, TU Delft - Rivers, Ports, Waterways and Dredging Engineering)
S. Vuren (Deltares, TU Delft - Hydraulic Structures and Flood Risk)
G.W.F. Rongen (HKV Lijn in Water)
Wim Uijttewaal (TU Delft - Environmental Fluid Mechanics)
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Abstract
With the
intention to reduce the negative effects
of ongoing bed erosion, as well as to improve
several other river functions such as protection
against floods, provision of safe and efficient
navigation and ecology, a ‘pilot project
longitudinal training dams’ was initiated. The training dams have recently been implemented in the Waal between Tiel and Sind Andries. In this project, river groynes have been completely removed and replaced by dams that lie parallel to the river bank. With
help of the longitudinal training dams,
a two-channel river system is created in
which the river is divided into a main
and side channel. The dams are placed in
a continuous manner with openings in
between that are relatively small compared
to the dam length. At the beginning and
end of the dam an inlet and outlet region is
situated, as shown in Fig. 1. The
combination of inlet and openings allows
for water and sediment to be divided between
the main and the side channel. Both inlet
and openings are constructed with the help
of a porous rock-layer. The crest heights
can be altered by adding or removing stones. This is expected to influence the amount of water and sediment entering the side channel and can therefore be used as a regulation
tool.