University of Twente Student Theses


Two-dimensional morphological modelling of the effects of the room for living rivers vision in the Middle-Waal

Welsch, N.M. (2021) Two-dimensional morphological modelling of the effects of the room for living rivers vision in the Middle-Waal.

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Abstract:Abstract: Ongoing bed degradation in the River Waal, partly induced by a long period of human intervening in the river Rhine, is leading negative impacts on different river functions. To mitigate these impacts, nature organisations in the Netherlands have come up with Room for Living Rivers (RfLR): a vision which balances ecology, flood protection and shipping interests. In this research, the ability of RfLR on mitigating the ongoing erosion in the Middle-Waal is investigated in 2D using the DVR model. This model, based on the Delft3D computational core, is capable of long-term, large scale morphological modelling using a series of steady-state flow conditions based on a representative hydrograph. By analyzing the difference in bed development in two scenarios, morphological changes induced by a combination of side side channels, large scale lowering of floodplains and removal of obstructions can be isolated. It is found that without intervening in the river, the river Waal does not reach a (dynamic) equilibrium within fifty years. The interventions are thus not able to stop this ongoing erosion; however, they show abilities to reduce the erosion rate locally and close to their location. The 2D model also shows large variability in the bed response in transverse direction. Depending on the connection of the side channel to main channel, two-dimensional processes, such as secondary flow may be enhanced, leading to decreased reduction of the ongoing erosion.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Programme:Civil Engineering and Management MSc (60026)
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