Reliability of predicted water levels ( figures)
Peterjan Broomans

Site of the project:
WL | delft hydraulics
Rotterdamseweg 185
2629 HD Delft
start of the project: March 2002

In June 2002 the Interim Thesis has been appeared. The Master project has been finished in February 2003 ( Masters Thesis). For working address etc. we refer to our alumnipage.

Summary of the master project:
A large area of The Netherlands is defended by dikes to prevent it from flooding. This protection needs maintenance and adaptations during time. Motivation for this are: an increase of sea water levels, heavy rain fall, changing of flow, increasing the number of environmental friendly protections, etc.

Before adaptations are made it is important to know the consequences of these adaptations. Previously this knowledge has been acquired by building scale models of the area and measure the resulting flow and water levels. Nowadays water levels and flow conditions are mostly predicted by using Computational Fluid Dynamics packages. These predictions are cheaper to obtain. Furthermore, it is easy to change the area, boundary conditions, etc.

Obviously the quality of the predictions depends on which effects are included in the model. However, the choices for the numerical techniques also influence the predicted water levels. The aim of this project is investigate these effects and to estimate the differences in the estimated water levels due to numerical choices. The consequences from wrong predictions can be very large. If the predicted water level is too low a flooding can be the result (see Figure 1), whereas if the predicted water level is too high costly adaptations of the dikes are made (see Figure 2), which are unnecessary.

Figure 1: A possible consequence if the predicted water level is too low

Figure 2: Adaptation of a dike

Contact information: Kees Vuik

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