Found 41 Outputs - Page 1 of 5
Rivierbodemdynamiek meenemen in het ontwerp van maatregelen
In the Dutch Waal river, the bed topography of the navigational channel is measured bi-weekly. In a so-called TKI-project (cooperation between Rijkswaterstaat, HKV and Twente University) we use this data to link morphological changes to specific interventions in the river. This is not a straightforward as it may seem, because the morphological changes are the sum of small scale changes due to e.g. the presence of groynes, medium scale changes coming from the intervention and large scale changes coming from engineering measures in the (far) past to which the profile is still adjusting. A so-called wavelet analysis can be used to disentangle these different scales and enables us to focus only on the morphological changes due to the intervention. This improves river operations and maintenance and in the future also to facilitate the planning of new measures to minimize morphological impact.
01/10/2020 by Pepijn van Denderen et al.
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Morphological patterns at the intake of a side channel over an oblique sill
Qualitative comparison of the river bed dynamics in the side channel of the longitudinal dam and the flat bed conditions in the scale model at low water level.
05/09/2018 by Timo de Ruijsscher et al.
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Quantifying biomass production for assessing ecosystem services of riverine landscapes
An approach for quantifying the changes in the biomass growth over the Dutch Rhine tributaries due to the river interventions and floodplain vegetation management between the years 1997 and 2012.
01/05/2018 by Remon Koopman et al.
View details View publicationThe initial morphological impact of the longitudinal dams
Human interventions can result in changes in the equilibrium profile of rivers. It is difficult to identify the bed level changes that result from river interventions due to the various causes of bed level changes. Using wavelet filtering, we are able to isolate the effect of river interventions based on the length scale over which they occur. The method presented here can aid in verifying model results. In addition, it can be used to estimate bed level changes that occur over various spatial scales.
13/02/2020 by Pepijn van Denderen et al.
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Insight into the local bed-level dynamics to assist management of multi-funtional rivers
River discharge fluctuations cause bed-level variations at various scales, resulting from spatial gradients in the river’s geometry. Insight into these bed-level variations and their relation to discharge fluctuations can help to predict and prevent the formation of local bottlenecks. In this paper, we use bi-weekly bed-level measurements of the river Waal to estimate the bed-level variations related to the river discharge.
11/02/2021 by Pepijn van Denderen et al.
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Biodiversity recovery following delta-wide measures for flood risk reduction
We show the biodiversity recovery from 15 years flood risk adaptation that consider nature requirements building a spatial extension to calculate biodiversity scores.
08/11/2017 by Menno Straatsma et al.
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Bank erosion processes measured with UAV-SfM
A fast and simple field technique to capture the topography of riverbanks and compute erosion rates.
25/10/2018 by Gonzalo Duró et al.
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Oblique aggradation: a novel explanation for sinuosity of low‐energy streams in peat‐filled valley systems
We inform stream restoration in peat-filled valleys by looking at the relative position of the erodible material to explain the origin of the stream bends in the Drentsche Aa area.
07/12/2016 by Jasper Candel et al.
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Laying bare systemic river bed changes in the river Rhine
It is important to link cause-and-effect relations between bed response and their dominating triggers. This is particularly important in highly-engineered navigable rivers, where multiple influences from close-by and further away can obscure the dominating causes of local bed level changes, and thereby possibly point in the wrong direction when it comes to sustainable river management practices.
11/02/2021 by Pepijn van Denderen et al.
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Application of a line laser scanner for bed form tracking in a laboratory flume
A new measurement method for continuous detection of bed forms in movable bed laboratory experiments is presented and tested.
23/03/2018 by Timo de Ruijsscher et al.
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