caa a22 4500 605546878 CHVBK 20210128100943.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10236-015-0818-x doi (NATIONALLICENCE)springer-10.1007/s10236-015-0818-x Numerical modelling of mixed-sediment consolidation [Elektronische Daten] [Florent Grasso, Pierre Le Hir, Philippe Bassoullet] Sediment transport modelling in estuarine environments, characterised by cohesive and non-cohesive sediment mixtures, has to consider a time variation of erodibility due to consolidation. Generally, validated by settling column experiments, mud consolidation is now fairly well simulated; however, numerical models still have difficulty to simulate accurately the sedimentation and consolidation of mixed sediments for a wide range of initial conditions. This is partly due to the difficulty to formulate the contribution of sand in the hindered settling regime when segregation does not clearly occur. Based on extensive settling experiments with mud-sand mixtures, the objective of this study was to improve the numerical modelling of mixed-sediment consolidation by focusing on segregation processes. We used constitutive relationships following the fractal theory associated with a new segregation formulation based on the relative mud concentration. Using specific sets of parameters calibrated for each test—with different initial sediment concentration and sand content—the model achieved excellent prediction skills for simulating sediment height evolutions and concentration vertical profiles. It highlighted the model capacity to simulate properly the segregation occurrence for mud-sand mixtures characterised by a wide range of initial conditions. Nevertheless, calibration parameters varied significantly, as the fractal number ranged from 2.64 to 2.77. This study investigated the relevance of using a common set of parameters, which is generally required for 3D sediment transport modelling. Simulations were less accurate but remained satisfactory in an operational approach. Finally, a specific formulation for natural estuarine environments was proposed, simulating correctly the sedimentation-consolidation processes of mud-sand mixtures through 3D sediment transport modelling. Springer-Verlag Berlin Heidelberg, 2015 Mud-sand mixtures nationallicence Hindered settling nationallicence Consolidation nationallicence Experiments nationallicence Numerical modelling nationallicence Segregation nationallicence Grasso Florent IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut Le Hir Pierre IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut Bassoullet Philippe IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut Ocean Dynamics Springer Berlin Heidelberg 65/4(2015-04-01), 607-616 1616-7341 65:4<607 2015 65 10236 https://doi.org/10.1007/s10236-015-0818-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10236-015-0818-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grasso Florent IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut NATIONALLICENCE 700 1- Le Hir Pierre IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut NATIONALLICENCE 700 1- Bassoullet Philippe IFREMER-DYNECO/PHYSED, Centre de Bretagne, BP 70, 29280, Plouzané, France aut NATIONALLICENCE 773 0- Ocean Dynamics Springer Berlin Heidelberg 65/4(2015-04-01), 607-616 1616-7341 65:4<607 2015 65 10236