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The effects of nature-based solutions on high and low flows in the Vecht using hydrological model Wflow sbm

Cazemier, William (2024) The effects of nature-based solutions on high and low flows in the Vecht using hydrological model Wflow sbm.

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Abstract:As the frequency and intensity of extreme river flows are expected to increase in the future, it is necessary to explore possible measures to mitigate these extreme events. This study evaluates the effectiveness of nature-based solutions (NBS) in mitigating extremely low and high river flows in the Vecht basin using Wflow sbm (v0.8.01), a distributed hydrological model. The Vecht basin is a 4,190 km² river basin located in Germany and the Netherlands. Wflow sbm provides satisfactory simulation results for historical periods in this basin. After an initial assessment of 12 nature-based solutions, afforestation and wetlands were found to have the most significant effects and were further evaluated. Both NBS lead to a reduction in peak discharge and average discharge under extreme rainfall during both summer and winter conditions. The 7-day minimum discharge slightly increases under afforestation but decreases under wetlands. These effects are promising but only appear in scenarios where more than 25% of all non-urban areas are converted to afforestation or wetlands. The spatial scale of implementation is therefore crucial to achieve significant impacts. It is recommended to couple the hydrological model with a groundwater model to evaluate the effectiveness of nature-based solutions on droughts more accurately.
Item Type:Essay (Master)
Clients:
Deltares, Delft, Netherlands
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
Link to this item:https://purl.utwente.nl/essays/104839
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