Print Email Facebook Twitter A Regime Shift From Low to High Sediment Concentrations in a Tide-Dominated Estuary Title A Regime Shift From Low to High Sediment Concentrations in a Tide-Dominated Estuary Author Dijkstra, Y.M. (TU Delft Mathematical Physics) Schuttelaars, H.M. (TU Delft Mathematical Physics) Schramkowski, G.P. (TU Delft Mathematical Physics; Flanders Hydraulics Research) Date 2019 Abstract Many estuaries are strongly deepened to improve navigation, with sometimes large and poorly understood consequences to suspended sediment dynamics. To improve understanding of such large changes, we study the Ems River Estuary, where a regime shift from low to high sediment concentrations was observed after deepening. The aim of this study is to improve understanding of the development of the sediment concentration regime over time and estimate the associated time scale. Using the idealized width-averaged iFlow model, we identify the coexistence of two distinct stable equilibrium regimes representing low and high sediment concentrations, qualitatively matching the regimes observed in the Ems. Depending on the river discharge, a critical depth profile is identified at which the regime shifts. By combining the model results and long-term observations of the tidal range, first indications of the regime shift are observed around 1989, taking approximately 6–7 years to develop. Subject deepeningEmsiFlowregime shiftsediment To reference this document use: http://resolver.tudelft.nl/uuid:3ec909ab-fec9-40a5-934f-1782c3651057 DOI https://doi.org/10.1029/2019GL082302 ISSN 0094-8276 Source Geophysical Research Letters, 46 (8), 4338-4345 Part of collection Institutional Repository Document type journal article Rights © 2019 Y.M. Dijkstra, H.M. Schuttelaars, G.P. Schramkowski Files PDF 53623421_Dijkstra_et_al_2 ... etters.pdf 1.27 MB Close viewer /islandora/object/uuid:3ec909ab-fec9-40a5-934f-1782c3651057/datastream/OBJ/view