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D.A.J. van Dieren
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2 records found
1
Conference paper
(2026)
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Debora van Dieren, Gijs Nannenberg, Astrid Blom, Kees Sloff, Ralph Schielen, Jaime Arriaga Garcia
The Pannerdense Kop is a key bifurcation in the engineered Dutch Rhine system where the Bovenrijn divides into the Waal and the Pannerden Canal. The discharge partitioning at the Pannerdense Kop is important for the Room for the River 2.0 programme, as it influences navigation, flood safety, and freshwater availability. Observations show that since the 1990s an increasing share of discharge is routed towards the Waal (Fig. 1), accompanied by a stronger erosional trend in the Waal than in the Pannerden Canal (Becker, 2021; Sloff, 2019; Chowdhury et al., 2023). A mechanism which may have caused this change is related to the peak flows in the 1990s, when the incoming sediment flux may have exceeded the transport capacity in the Pannerden Canal (Chowdhury et al., 2023; Blom et al., 2024). This stresses the importance of the morphological behaviour during peak flows. During peak flows, morphological adjustments around the bifurcation occur on multiple spatial scales, from dune dynamics affecting roughness (Julien et al., 2002; Frings & Kleinhans, 2008) to patterns related to floodplains, groynes, and bends (Ahrendt et al., 2022; Parker et al., 2011), yet existing knowledge is fragmented across individual processes and time periods. This research therefore provides a comprehensive multiscale analysis of morphological behaviour at the Pannerdense Kop by combining multiple field datasets with output from 1D and 2D morphodynamic models and systematically comparing their responses.
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The Pannerdense Kop is a key bifurcation in the engineered Dutch Rhine system where the Bovenrijn divides into the Waal and the Pannerden Canal. The discharge partitioning at the Pannerdense Kop is important for the Room for the River 2.0 programme, as it influences navigation, flood safety, and freshwater availability. Observations show that since the 1990s an increasing share of discharge is routed towards the Waal (Fig. 1), accompanied by a stronger erosional trend in the Waal than in the Pannerden Canal (Becker, 2021; Sloff, 2019; Chowdhury et al., 2023). A mechanism which may have caused this change is related to the peak flows in the 1990s, when the incoming sediment flux may have exceeded the transport capacity in the Pannerden Canal (Chowdhury et al., 2023; Blom et al., 2024). This stresses the importance of the morphological behaviour during peak flows. During peak flows, morphological adjustments around the bifurcation occur on multiple spatial scales, from dune dynamics affecting roughness (Julien et al., 2002; Frings & Kleinhans, 2008) to patterns related to floodplains, groynes, and bends (Ahrendt et al., 2022; Parker et al., 2011), yet existing knowledge is fragmented across individual processes and time periods. This research therefore provides a comprehensive multiscale analysis of morphological behaviour at the Pannerdense Kop by combining multiple field datasets with output from 1D and 2D morphodynamic models and systematically comparing their responses.
Journal article
(2024)
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Niels W. P. Brevé, Debora A. J. van Dieren, Marc Weeber, Erik Mosselman, Leopold A. J. Nagelkerke, Albertinka J. Murk, Anthonie D. Buijse
Information about reproductive habitat and migration pathways is of paramount importance to restore migratory fish species. This study assesses the availability of spawning and nursery habitats for the European sturgeon (Acipenser sturio) in the delta and lower Rhine (covering over 350 river kilometres) as part of a larger feasibility assessment for a future restoration of this critically endangered species. The general approach has three steps: (1) the identification of the species' specific habitat requirements, based on a systematic literature review; (2) the collection and preprocessing of data from two countries, including the 1D and 2D modelling of water depths and flow velocities; and (3) GIS-based mapping of spawning and nursery habitat. Based on a HSI score of 1, we identify a total of 0.75 km2 as minimal spawning habitat, potentially suitable for approximately 2500 female European sturgeons (one spawning site would use ~300 m2). This is sufficient, as currently, only an estimated maximum number of 750 adults exist. Suitable spawning habitat is mainly located in the German state of North Rhine-Westphalia, whereas suitable nursery habitat is mainly located in the Netherlands. The availability is, however, significantly reduced by coastal infrastructure (damming) and inland navigation. The insights gained can be used to assess the current suitability of the river Rhine for the species' reintroduction and to identify opportunities for habitat restoration and protection for various life stages. The outcomes thus play an essential role in the conservation of the species. In addition, the modelling approach developed could be applied to other northwestern European rivers. This broader application would allow intercomparison and support decisions about which rivers are best suited for future reintroduction of the critically endangered European sturgeon.
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Information about reproductive habitat and migration pathways is of paramount importance to restore migratory fish species. This study assesses the availability of spawning and nursery habitats for the European sturgeon (Acipenser sturio) in the delta and lower Rhine (covering over 350 river kilometres) as part of a larger feasibility assessment for a future restoration of this critically endangered species. The general approach has three steps: (1) the identification of the species' specific habitat requirements, based on a systematic literature review; (2) the collection and preprocessing of data from two countries, including the 1D and 2D modelling of water depths and flow velocities; and (3) GIS-based mapping of spawning and nursery habitat. Based on a HSI score of 1, we identify a total of 0.75 km2 as minimal spawning habitat, potentially suitable for approximately 2500 female European sturgeons (one spawning site would use ~300 m2). This is sufficient, as currently, only an estimated maximum number of 750 adults exist. Suitable spawning habitat is mainly located in the German state of North Rhine-Westphalia, whereas suitable nursery habitat is mainly located in the Netherlands. The availability is, however, significantly reduced by coastal infrastructure (damming) and inland navigation. The insights gained can be used to assess the current suitability of the river Rhine for the species' reintroduction and to identify opportunities for habitat restoration and protection for various life stages. The outcomes thus play an essential role in the conservation of the species. In addition, the modelling approach developed could be applied to other northwestern European rivers. This broader application would allow intercomparison and support decisions about which rivers are best suited for future reintroduction of the critically endangered European sturgeon.