University of Twente Student Theses


The influence of pinch culvert on the water system of the Glanerbeek in a historical and future climate

Gabriëls, S.P.M. (2021) The influence of pinch culvert on the water system of the Glanerbeek in a historical and future climate.

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Abstract:The climate is changing. The last few summers have been very dry and showers have simultaneously been getting more extreme. These trends are expected to increasingly continue in the future (Verweij et al., 2010), which is likely to cause problems. The region Twente, located in the east of the Netherlands, is relatively elevated and the ground exists mostly of thin and sandy water-permeable layers. This set of characteristics causes water to be discharged relatively fast and this can result in dry water channels during dry periods. The organisation responsible for water management in the area, waterboard Vechtstromen, counters this effect with the use of weirs and culverts. These existing structures are however not considered to be flexible enough to cope with the extremes climate change will bring. Vechtstromen is therefore interested in pinch weirs and pinch culverts and the extent to which they can influence water systems. This study investigates the influence pinch culverts can have on the management area of Vechtstromen in the current and future climate. Glanerbeek, an representative area for a significant part of Twente, is chosen as a study area for this research. An existing Sobek 2.14 model of this area is used to calculate the flows through Glanerbeek. This model is combined with a previously made and area-specific Walrus model (Attema, 2020), which calculates the rainfall runoff and gives more detailed input for the Sobek model. The results from the study show that pinch culverts do have a significant influence on the discharge from the study area: peak discharges are reduced by 38% compared to the current situation and pinch culverts are having an influence in 240 days per year. This influence is even larger for the future climate. The study also shows that pinch culverts with 50% of the original culverts diameter have virtually no influence, while pinch culverts with 25% of the original diameter tend to cause flooding at multiple locations in the study area. It can be concluded that pinch culverts do have a valuable influence on the water systems, especially for future climates, but that attention to their dimensions is required.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Programme:Civil Engineering BSc (56952)
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