The set of equations used in modelling river  morphodynamics needs to be (at least) wellposed  to be representative of the real natural  phenomenon. As we deal with a time dependent  process the solution needs to be wave-like to be  well-posed. In other words, the solution must  have a domain of dependence and of influence.  Otherwise, the future river state influences the  present solution, which is physically unrealistic.  Based on an analysis of the system of  equations to model one-dimensional river  morphodynamics with unisize sediment and a  Chezy-based friction term, Cordier (2011)  concluded that the system is always well-posed.  Stecca (2014) extended the analysis to a mixture  of sediment with 2 size fractions and concluded  that under degradational conditions the system  may become ill-posed. This result supported the  first analysis that found ill-posedness in mixedsize  sediment morphodynamics conducted by  RIbberink (1987) assuming a simpler model.  Here we extend these analyses by adding the  effects of flow curvature which creates an  intrinsically 3D flow referred to as secondary or  spiral flow (Van Bendegom, 1947). In this study  the flow is assumed bi-dimensional which implies  that the secondary flow needs to be  parameterized.  @en

The Equatorian Daule and Babahoyo rivers combine into the tidal Guayas River with the largest estuary on the Pacific coast of South America. The city of Guayaquil, located along the Guayas, is the main port of Ecuador but at the same time the planet’s fourth most vulnerable city for future flooding due to climate change, after Guangzhou, Mumbai and Kolkata. Fluvial sedimentation is seen as one of the factors contributing to the risk of flooding. It increases water levels, it blocks the drainage from urban flooding and water treatment plants, it deteriorates navigation conditions, and it produces a mid-channel bar called “Islota del Palmar”. This bar attracts birds that hinder air traffic around the nearby airport. The growth of this bar pushes currents against the erodible bank along the Samborondón residential area. Sedimentation rates have increased in recent years, which is locally perceived as a result of deforestation in the upper catchment. The planning and design of effective mitigation measures, however, require a more precise understanding of what causes sedimentation. Therefore we carried out a systematic analysis using the new flexible-mesh version of the Delft3D modelling system. We found that sedimentation in the Guayas has no relation with upstream deforestation. Rather, the sediment originates from the downstream estuary instead of the upstream catchment. This complies with the presence of marine sands in the river as reported by a dredging company. We could explain the import of sediment from the asymmetry of the tide, and the recent increase in sedimentation rates to land reclamation and to a decrease of episodic flushing by river floods due to upstream dam construction. Only the deposition of silt and clay in connected stagnant water bodies could perhaps be ascribed to upstream deforestation. These insights will guide the planning and design of effective solutions.@en

The Equatorian Daule and Babahoyo rivers combine into the tidal Guayas River with the largest estuary on the Pacific coast of South America. The city of Guayaquil, located along the Guayas, is the main port of Ecuador but at the same time the planet’s fourth most vulnerable city for future flooding due to climate change, after Guangzhou, Mumbai and Kolkata. Fluvial sedimentation is seen as one of the factors contributing to the risk of flooding. It increases water levels, it blocks the drainage from urban flooding and water treatment plants, it deteriorates navigation conditions, and it produces a mid-channel bar called “Islota del Palmar”. This bar attracts birds that hinder air traffic around the nearby airport. The growth of this bar pushes currents against the erodible bank along the Samborondón residential area. Sedimentation rates have increased in recent years, which is locally perceived as a result of deforestation in the upper catchment. The planning and design of effective mitigation measures, however, require a more precise understanding of what causes sedimentation. Therefore we carried out a systematic analysis using the new flexible-mesh version of the Delft3D modelling system. We found that sedimentation in the Guayas has no relation with upstream deforestation. Rather, the sediment originates from the downstream estuary instead of the upstream catchment. This complies with the presence of marine sands in the river as reported by a dredging company. We could explain the import of sediment from the asymmetry of the tide, and the recent increase in sedimentation rates to land reclamation and to a decrease of episodic flushing by river floods due to upstream dam construction. Only the deposition of silt and clay in connected stagnant water bodies could perhaps be ascribed to upstream deforestation. These insights will guide the planning and design of effective solutions.@en

The Equatorian Daule and Babahoyo rivers combine into the tidal Guayas River with the largest estuary on the Pacific coast of South America. The city of Guayaquil, located along the Guayas, is the main port of Ecuador but at the same time the planet’s fourth most vulnerable city for future flooding due to climate change, after Guangzhou, Mumbai and Kolkata. Fluvial sedimentation is seen as one of the factors contributing to the risk of flooding. It increases water levels, it blocks the drainage from urban flooding and water treatment plants, it deteriorates navigation conditions, and it produces a mid-channel bar called “Islota del Palmar”. This bar attracts birds that hinder air traffic around the nearby airport. The growth of this bar pushes currents against the erodible bank along the Samborondón residential area. Sedimentation rates have increased in recent years, which is locally perceived as a result of deforestation in the upper catchment. The planning and design of effective mitigation measures, however, require a more precise understanding of what causes sedimentation. Therefore we carried out a systematic analysis using the new flexible-mesh version of the Delft3D modelling system. We found that sedimentation in the Guayas has no relation with upstream deforestation. Rather, the sediment originates from the downstream estuary instead of the upstream catchment. This complies with the presence of marine sands in the river as reported by a dredging company. We could explain the import of sediment from the asymmetry of the tide, and the recent increase in sedimentation rates to land reclamation and to a decrease of episodic flushing by river floods due to upstream dam construction. Only the deposition of silt and clay in connected stagnant water bodies could perhaps be ascribed to upstream deforestation. These insights will guide the planning and design of effective solutions.@en