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Analyzing natural bed-level dynamics to mitigate the morphological impact of river interventions

van Denderen, R. Pepijn (author), Schielen, R.M.J. (author), Paarlberg, Andries J. (author), Reneerkens, Michiel (author), Augustijn, Denie C. M. (author)

Local river interventions, such as channel narrowing or side channels, are often necessary to maintain safety, ecology, or navigation. Such interventions have different effects on the river's bed morphology during periods of high- and low-discharge events. Mapping the bed-level variations for different discharge levels and understanding these...

journal article 2024

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River Bed Response to Sea Level Rise

Scherpbier, Mieke (author)

Climate change is causing the global sea level to rise. Research and discussion of the effects of sea level rise are often focused along coastlines. However, the effects of higher water level and changing morphodynamics can reach far inland via rivers. This study uses a one-dimensional numerical model to analyze bed level response to sea level...

master thesis 2022

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River Bar Downscaling with Bed Sills and Bottom Groynes: A Numerical Study

Alahmady, Gamal (author), Crosato, A. (author), Werner, Micha (author)

conference paper 2022

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Adaptation of river channels to a wetter or drier climate: Insights from the Lower Pilcomayo River, South America

Crosato, A. (author), Grissetti-Vázquez, A. (author), Bregoli, F. (author), Franca, M.J. (author)

Climate change has a direct influence on both hydrology and floodplain vegetation of water courses, which are key players in river morphodynamics. The river system response to climate change is complex and the effects of non-linear interactions between alterations in water, sediment and vegetation remain incompletely understood. Which of...

journal article 2022

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Disentangling changes in the river bed profile: The morphological impact of river interventions in a managed river

van Denderen, R. Pepijn (author), Kater, Emiel (author), Jans, Luc H. (author), Schielen, R.M.J. (author)

The river bed level in low-land rivers like the Rhine branches in The Netherlands changes continuously on various spatial and temporal scales. Large-scale degradation occurs in many rivers due to river-wide engineering interventions, such as channelization, in the last decades and centuries. Local river interventions, such as the construction...

journal article 2022

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Bank erosion in regulated navigable rivers

Duro, G. (author)

Banks constitute important areas for the river ecology since they provide a multitude of favourable conditions for flora and fauna. The hydromorphological diversity typical of these transitional zones between water and land, and the associated processes of erosion and accretion, make riverbanks vital for many aquatic and riparian plants and...

doctoral thesis 2021

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Numerical study on the transition between river bar regimes due to varying discharge

Montijn, Roline (author), Mosselman, E. (author), Sloff, C.J. (author)

poster 2021

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Propagation of sediment waves associated with coarse gravel nourishments

Acevedo Goldaracena, Fernando (author)

Sediment nourishments have become an increasingly attractive alternative to deal with continuous bed degradation problems in the river system. When supplied to the river, sediment nourishments induce a sediment wave that propagates through the system causing changes in bed level and bed surface texture. In the present study we use a one...

master thesis 2020

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Assessment of the functional performance of lowland river systems subjected to climate change and large-scale morphological trends

Hiemstra, K.S. (author), van Vuren, S. (author), Vinke, Frederik R.S. (author), Jorissen, Richard E. (author), Kok, M. (author)

Worldwide, rivers provide important socio-economic and environmental functions and are essential to human well-being. The growing demand of user-functions and the change in river conditions due to large-scale morphology and climate change, increase the pressure on lowland river systems (e.g. Rhine, Meuse, Danube and Mississippi). To ensure a...

journal article 2020

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Schematisation of discharge time series in morphodynamic river models

Gradussen, Bas (author)

River discharge is an essential parameter in morphodynamic modelling. It proves to be highly variable in both time and space. In this thesis the impact of the schematisation of time-dependent discharge series on morphodynamic change is studied. The impact is governed by several factors such as the long-term discharge statistics, and both short-...

master thesis 2019

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The Quasi-Equilibrium Longitudinal Profile in Backwater Reaches of the Engineered Alluvial River: A Space-Marching Method

Arkesteijn, L. (author), Blom, A. (author), Czapiga, Matthew J. (author), Chavarrias Borras, V. (author), Labeur, R.J. (author)

An engineered alluvial river (i.e., a fixed-width channel) has constrained planform but is free to adjust channel slope and bed surface texture. These features are subject to controls: the hydrograph, sediment flux, and downstream base level. If the controls are sustained (or change slowly relative to the timescale of channel response), the...

journal article 2019

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Morphological Adaptation of River Channels to Vegetation Establishment: A Laboratory Study

Vargas-Luna, Andrés (author), Duro, G. (author), Crosato, A. (author), Uijttewaal, W.S.J. (author)

While the scientific community has long recognized that alluvial rivers are the product of interactions between flowing water and bed material transport, it is increasingly evident that vegetation mediates these interactions and influences the stream channel characteristics. In a novel set of mobile bed laboratory experiments with variable...

journal article 2019

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Impact of flow variability and sediment characteristics on channel width evolution in laboratory streams

Vargas Luna, A. (author), Crosato, A. (author), Byishimo, P. (author), Uijttewaal, W.S.J. (author)

Alluvial rivers are shaped by sequences of water flows excavating their channels. Observations show that besides the magnitude, the frequency and duration of streamflow oscillations might also be important for the river channel formation. In addition, the river morphology appears influenced by both size and degree of uniformity of the...

journal article 2018

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Ill-posedness in modeling mixed sediment river morphodynamics

Chavarrias Borras, V. (author), Stecca, G. (author), Blom, A. (author)

In this paper we analyze the Hirano active layer model used in mixed sediment river morphodynamics concerning its ill-posedness. Ill-posedness causes the solution to be unstable to short-wave perturbations. This implies that the solution presents spurious oscillations, the amplitude of which depends on the domain discretization. Ill-posedness...

journal article 2018

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Experimental research on channel closure in braided rivers

Spielmann, Peter (author)

The dynamic nature of braided rivers can lead to river bank erosion, bankline shifts and navigational hindrance. River training measures can be implemented in order to mitigate these problems. An alternative to conventional river training works is the closure of a channel within the braided network. Until recent there has been no systematic...

master thesis 2018

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Channel closure in large sand-bed braided rivers

Ostanek Jurina, Tadej (author)

In large braided rivers, river training is often required to protect the banks against erosion, to improve navigability and for land reclamation. Closing one of the channels is a promising option to achieve these goals. However, there is a lack of systematic research on channel closures and no guidelines for their use exist. In the few...

master thesis 2017

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Morphodynamic trends in the freely flowing Rhine: A literature review

Emmanouil, A. (author)

The river Rhine is subject to a multitude of controls imposed by nature and humans. Natural controls refer to climate and tectonics, while human activity is represented by a series of interventions aimed at flood protection, navigation, land reclamation and exploitation of river supplied resources such as hydro energy and sediment. These...

master thesis 2017

document

Riverbank protection removal to enhance bar formation for habitat diversity

Wetser, A. (author)

Over the past centuries natural riverbanks have been transformed into banks with artificial revetments or sheet piles to protect them from erosion, which led to disappearance of important river features for flora and fauna. River restoration projects show that the removal of man-made bank protections may lead to the formation of bars (e.g. Van...

master thesis 2017

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Morphodynamic assessment of side channel systems using a simple one-dimensional bifurcation model and a comparison with aerial images

van Denderen, R. Pepijn (author), Schielen, R.M.J. (author), Blom, A. (author), Hulscher, Suzanne J.M.H. (author), Kleinhans, Maarten G. (author)

Side channel construction is a common intervention applied to increase a river's conveyance capacity and to increase its ecological value. Past modelling efforts suggest two mechanisms affecting the morphodynamic change of a side channel: (1) a difference in channel slope between the side channel and the main channel and (2) bend flow just...

journal article 2017

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Role of vegetation on river bank accretion

Vargas Luna, A. (author)

There is rising awareness of the need to include the effects of vegetation in studies dealing with the morphological response of rivers. Vegetation growth on river banks and floodplains alters the river bed topography, reduces the bank erosion rates and enhances the development of new floodplains through river bank accretion. The role of...

doctoral thesis 2016