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Found 27 Outputs - Page 2 of 3

The evolution of primary dunes during low flows on the Waal river

05/10/2022 by Lieke Lokin

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Future sediment budget and distribution for the Rhine-Meuse delta

Delta channels worldwide are undergoing natural and anthropogenic activities which change their sediment budget and sediment distribution. The Rhine-Meuse delta. The primary cause of this loss is the extensive dredging undertaken in the RMD which maintains navigation to the network of offshore and inland ports which make up the Port of Rotterdam (Becker (2015); Cox et al. (submitted)). As sea levels rise and upstream sediment supply is predicted to decrease, knowledge of future sediment budgets and distribution is crucial to maintain delta elevation. Here we construct a sediment budget for two future scenarios 2050 and 2085 which incorporate both socio-economic change and climate scenarios for the region.

11/02/2021 by Jana Cox

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Bed level change in the Upper Rhine Delta and Niederrhein

10/07/2020 by Claudia Ylla Arbos

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Towards a model for river dune dynamics under high and low discharges

13/02/2020 by Lieke Lokin

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A sediment budget for the Rhine-Meuse estuary: importance of dredging and the North Sea sediment flux

Sediment budgets are an important tool that can be used to summarize the complex sediment dynamics that occur at the fluvial-tidal transition. Estuaries and deltas form at this transition and their morphology and hydrodynamic processes are directly decided by the amount of sediment present. The amount of sediment present is determined by inflowing rivers, sediment transported and moved by the tides and by direct human intervention. Sediment budgets encompass these diverse processes and allow for direct annual comparisons of the net gain or loss of sediment in a given region. A net loss of sediment leads to a myriad of problems including increased flood risk, damage to or loss of ecologically valuable areas and bed level degradation of channels.

05/10/2022 by Jana Cox

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Superimposed bedforms in the Rhine-Meuse delta

Bedforms superimposed on river dunes have been observed in many river systems worldwide, including the Rhine-Meuse delta. It is unclear under which circumstancesthey occur, and how they relate to flow conditions, sediment transport and the migration and morphology of the primary dune. Laboratory experiments suggest that superimposed bedforms are the agency by which the primary dune migrates (Venditti et al., 2005). In this case, the superimposed bedforms travel over the stoss side and collapse at the lee side. However, in natural rivers,superimposed bedforms have been observed on the leesides of primary lowangle dunes (Galeazzi et al., 2018). This research aims to elucidate the role of superimposed bedforms in rivers and to determine whether superimposed bedforms contribute to the transport of bed sediment and how they interact with primary dunes.

13/02/2020 by Judith Zomer

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RiverLab – the numerical experimental facility for river research

05/10/2022

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Pilot NKWK

In this document, the pilot for a river research programme is discussed. This pilot was the base for Rivers2Morrow.

01/11/2017 by Ralph Schielen

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Contains: General Information Rivers2Morrow

Bed level change in the upper Rhine Delta since 1926 and rough extrapolation to 2050

This study constitutes a first step into predicting the long term morphodynamic response of the Upper Rhine- Delta to climate change. The aim is to get deeper insight into past bed level trends and explore options for data-based extrapolation. Here we consider the period between now and 2050. This project has thus a twofold objective. On one hand, we focus on the current trends in bed elevation. On the other hand, we are interested in projections for the period 2020-2050.

01/11/2019 by Claudia Ylla Arbos

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A regularization strategy for the two-dimensional active layer model

05/10/2022

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