Download e-book for kindle: Modeling morphodynamic evolution in alluvial estuaries: by Mick van der Wegen

By Mick van der Wegen

The most target of this examine is to enquire the governing approaches and features that force morphodynamic evolution in alluvial estuaries by way of software of a process-based numerical version (Delft3D). it really is of extreme value to appreciate estuarine strategies in order that impression of human interference (like dredging and land reclamation) and long term adjustments (like sea point upward thrust) may be evaluated. The learn addresses a few circumstances starting from an oblong basins to genuine estuaries just like the Western Scheldt within the Netherlands or San Pablo Bay in California. The extra schematized technique permit to check morphodynamic evolution over a number of millennia lower than consistent forcing and solutions extra basic questions regarding stipulations of equilibrium and similar time scales. The extra practical instances supply perception into the ability of the strategy in predicting decadal morphodynamic advancements. extra procedures are incorporated to imitate life like stipulations and version effects are in comparison to bathymetric measurements over the past century. The learn indicates that the modeling technique is sweet in a position to describing reliable morphodynamic calculations over a timescale of millennia with styles just like styles saw in fact. also, the technique indicates that it's attainable to foretell decadal morphodynamic advancements in genuine estuaries with major ability.

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Extra info for Modeling morphodynamic evolution in alluvial estuaries: UNESCO-IHE PhD Thesis

Example text

It would be expected that longer model runs would reveal the formation of more intertidal area near the head, similar to the current 1D model outcomes. The short literature overview indicates that a proper formulation of the boundary including drying and flooding of cells at the head is essential. The current model applies an approach that includes drying and flooding of the intertidal area developing near the head. The results show a continuous sedimentation at the head. Furthermore, shallower initial conditions will lead to more sedimentation.

Flow characteristics shape the bed and bed level developments, in their turn, direct the flow. The details of the model are described in the following section. 2 Strategy The thesis starts from a relatively simple model set up with highly schematized model configuration (a rectangular tidal basin filled with uniform sand and forced by a semidiurnal tide) to study characteristic morphodynamic evolution over millennia. In subsequent chapters more processes are added, free behavior is restricted and the timescale is reduced, to finally end up with a model configuration that matches the geometry of a real alluvial estuary and a ‘‘comprehensive’’ timescale that allows model validation with measured morphological developments.

However, no trustworthy morphological data are available. Still a model can be developed having only few data available. Predictions on tidal water levels can be derived from easily available models that are based on harmonic analysis of the tidal constituents. Also, river discharges are usually available via measurement stations. Roughly, the shape of the estuary can be known from remote sensing (satellite) data. Based on these boundary conditions a numerical model could be developed that describes the hydrodynamics, the sediment transport and the resulting bathymetry from an initial flat bed.

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