A one-dimensional vertical two-phase flow model for sedimentation-consolidation process is presented. The model is based on solving the continuity and momentum equations for both fluid and solid phases. In the non-cohesive case, the momentum transfer between the two phases is reduced to the drag force around a single particle modified to take the hindrance effects into account. In the cohesive case, Darcy-Gersevanov's law is used for the closure of the momentum transfer between the two phases and the concept of "effective stress" is introduced to take into account the bed structuring. These closure laws are validated against high resolution experimental data in terms of settling curves and concentration profiles. The reliability of the model is illustrated from an analysis of the momentum balances at different stages during the process. Finally, the proposed closure laws and numerical algorithms are shown to be able to quantitatively reproduce sedimentation of non-cohesive and sedimentationconsolidation of cohesive sediments, including mud.

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[1] A year-long simulation of the Mekong river plume is conducted. The purpose is to identify the main processes impacting the fate of tropical freshwater runoff onto the shelf for later inclusion into a global ocean circulation model. Factors influencing the river plume in a general case are listed and are included in a coastal ocean configuration of the Princeton Ocean Model. This is achieved either explicitly, as for wind forcing, or using parametrizations corresponding to the length and timescales of river plumes physics, as for tides or estuaries. Results exhibit a strong seasonal variability related to the monsoon wind and river flow regimes of the region. A comparison with in situ measurements made during a campaign carried out in 1997 shows a good agreement. Vertical salinity profiles extracted from the model configuration correspond to conductivity-temperature-depth salinity profiles behavior established during the campaign. This model configuration also provides a good estimate of sea surface salinity in the vicinity of the coast of the Mekong Delta.

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