Scheldt 2DV model_D3D-iflow hybrid approach

This report builds up on the work presented in the 2016 Deltares report “Sediment transport in a schematized Scheldt. Regime Shift”. The goal of this previous report was to assess the conditions in which sediment was imported from the sea into the estuary, particularly to the water column, studying the transition to hyper-turbidity. Rather than continuing testing new combinations of parameters and processes aiming for the ideal situation, we decided to go one step back and study if hyper-turbid conditions could ever be maintained in an estuary like the one in our study. Therefore, we stopped studying the dynamic process and focussed on the stationary process of hyper-turbid conditions. In order to check whether hyper-turbid conditions are possible, we studied the conditions under which hyper-turbidity may occur with an iFlow model, and reported findings over two memos. The highlights and most practical aspects of these memos are discussed. The iFlow model is briefly introduced and the results of a number of iFlow simulations are summarized. The results do show stable hyperturbid conditions. Later the settings and parameter space that were recommended -and that resulted in hyper-turbidity when modelled in iFlow- were tested in D3D.