Sediment transport over sills at longitudinal training dams with unaligned main flow
S.M.M. Jammers (HKV Lijn in Water, Deltares, National University of Singapore)
AJ Paarlberg (HKV Lijn in Water)
Wim Uijttewaal (TU Delft - Environmental Fluid Mechanics)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Longitudinal
training dams (LTDs) are constructed in
the River Waal in the Netherlands. They
are aligned parallel to the river shore
and divide the river into a main and side
channel. The existing groynes are removed
yielding more discharge capacity at high
flows. The side channel creates possibly a
sheltered environment for species compared to the traditional groyne field (Collas, 2014). Although the lay-out of the LTDs has been extensively studied using numerical models (e.g. Huthoff et al., 2011), the
morphodynamic response is yet unclear and
depends strongly on the dimensions
(length and height) of the openings. The
inlet and openings (see Fig. 1) are
sill-type structures which can be changed
relatively easy. These sills are
designed in such a way that they serve
as a barrier for water and bed load sediment.
To make long-term morphological predictions,
it is necessary to understand the bed
load transport processes over these sills.
Suspended sediment transport is not
considered in this study. We developed an analytical model to predict sediment
transport paths on a slope, using a
correction on the well-known critical
Shields parameter.