Research Outputs

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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We reveal the existence of two additional mechanisms under which the 2D system of equations does not provide a unique solution.

11/04/2019 by Victor Chavarrias et al.

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We show that the multidimensional evaluation of river interventions in the Waal river opens up opportunities to discuss possible trade-offs.

19/09/2018 by Menno Straatsma et al.

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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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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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Using residual biomass, such as grass and wood chips, as a resource instead of treating it as waste is not automatically more sustainable.

20/12/2018 by Swinda Pfau et al.

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We provide information on biomass applications and type of contractual arrangements for using residual riverine biomass as ecosystem service.

18/01/2019 by Astrid Bout et al.

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A practical solution for monitoring areas of a few kilometers and derive land cover classification with high accuracies.

19/07/2019 by Wimala van Iersel et al.

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Seven flood reduction measures along the Waal river were ranked according to the water level reduction and the displaced material for their implementation.

01/03/2018 by Menno Straatsma et al.

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A method to quickly detect where floodplain vegetation changes occur and to which vegetation class did they change.

20/04/2024 by Wimala van Iersel et al.

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