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Evaluation of the BOS-Regge model

Lange, J.J.H. de (2025) Evaluation of the BOS-Regge model.

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Abstract:The Netherlands is one of the most developed countries in terms of water safety. One of the ways they maintain this safety is through numerous models that predict high waters. Waterschap Vechtstromen also possesses one of these models, named FEWS Vecht. It is an operating model which controls several underlying models of its main river and tributaries. The Bos Regge model represents one of the tributaries and exports its calculated data to FEWS Vecht. The Bos Regge model was constructed in 2022 for application in FEWS Vecht. However, since then no investigation has been conducted on its reliability. It therefore remains uncertain how to utilise the Bos Regge model. Waterschap Vechtstromen is responsible for regulations during high-water situations. To regulate this as best as possible, the waterboard would like to have a reliable model which can be operationally used in FEWS Vecht. This study focuses on improving the Bos Regge model and researching whether it can be operationally used in FEWS Vecht. This will be done by comparing the current model with measurements of highwater situations and data from Waterschap Vechtstromen. The Bos Regge model is a SOBEK 2.15 model consisting of two different modules: a hydrological module and a hydrodynamic module. The hydrological module uses the rainfall-runoff model of WALRUS, which calculates discharges from different sub-catchments based on meteorological data. The model consists of various parameters, which impact the behaviour of the peak discharges. How the different parameters impact those discharges will be analysed. The hydrodynamic model will be evaluated based on data available from the water board. These are the database GEOWeb, the current NBW model, and the Atis regulation system for weirs. During the study, it was concluded that the model which was made in 2022 contained several errors. The main reason for this is that there have been no further adaptations since then. However, due to regulations and adaptations, the water system has changed over the years. The changes in the water system have been applied in the hydrodynamic model as realistically as possible. The input parameters of the WALRUS model were generating peak discharge with the wrong behaviour. Due to the number of parameters in the WALRUS model, there was no clear solution. Therefore, it was chosen not to take into account parameters with minor impact, but only to analyse a selective group of parameters with significant impact. Due to the shortage of measurement locations, not all the catchments could be analysed. All the adaptations to both modules have been combined and were compared to the measured peak data. To analyse the reliability of the model, several requirements from the operators of FEWS Vecht were set. From that comparison, it turned out that the model didn’t fully meet the requirement to operate in FEWS Vecht. Nevertheless, there was a significant improvement. To ensure that the Bos Regge model can be used operationally in the future, it should be further investigated why the peak events did not meet the requirements.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Programme:Civil Engineering BSc (56952)
Link to this item:https://purl.utwente.nl/essays/107581
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