|Development of a mud transport model for the Scheldt estuary in the framework of LTV|
van Kessel, T.; Vanlede, J.; de Kok, J. (2007). Development of a mud transport model for the Scheldt estuary in the framework of LTV. Delft Hydraulics: [s.l.]. 81 pp.
In 2006, a work plan was conceived for the development of a mud transport model for the Scheldt estuary in the framework of LTV (Long Term Vision) (Winterwerp and De Kok, 2006). The purpose of this model is to support managers of the Scheldt estuary with the solution of a number of managerial issues. Also in 2006, the first two phases were initiated. The present report discusses the activities that have been carried out during the first half of 2007, i.e. Further improvement of the hydrodynamic and mud transport model.At a technical level, all model improvements scheduled for 2007 have been implemented. The most important developments are: longer hydrodynamic simulation period (up to one year), more accurate concentration boundary conditions, variable wave effects and biological effects.The hydrodynamic simulation yields realistic values for water levels and salinities, although it is expected that the modelled velocities will be too high. Three actions are identified that can enhance the simulated hydrodynamics:
Regarding the mud transport simulations, the following is concluded:
- The high fresh water inflow event in the beginning of March can be modelled more accurately by adding more data points in the time series of fresh water inflow to increase the volume of fresh water contained in the peak.
- The time series of fresh water inflow of the Bathse Spuikanaal has to be added in the model
- A different set of boundary conditions could yield better results for water levels.
- A minor shift of two dumping locations near Antwerp much improves the proper modelling of the ETM
- New concentration boundary conditions at sea result in more realistic SPM concentrations at sea
- The difference between simulations with 5 and 10 horizontal layers is only minor
- Variable waves temporarily enhance the concentration in the western part of the Western Scheldt during storms
- The biological impact on large-scale SPM concentrations in the Scheldt estuary appears to be minor
- The SPM levels appear to be rather sensitive to the volume of harbour situation and dumping