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Discharge and location dependency of calibrated main channel roughness: case study on the river Waal and IJssel

Domhof, B.C.A. (2018) Discharge and location dependency of calibrated main channel roughness: case study on the river Waal and IJssel.

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Abstract:To accurately predict water levels, river models require appropriate description of the hydraulic roughness. The bed roughness increases as river dunes grow with increasing discharge and the roughness depends on differences in main channel and floodplain width and bed sediment. Therefore, we hypothesize that the calibrated main channel roughness coefficient is most sensitive to the discharge and location in longitudinal direction of the river. The roughness is determined by calibrating the Manning coefficient of the main channel in a 1D hydrodynamic model. The River Waal and IJssel in the Netherlands are used as case studies. Results show that the calibrated roughness is mainly sensitive to discharge. Especially the transition from bankfull to flood stage, effects of floodplain compartmentation and bankfull overflow in sharp bends are important features to consider in the calibration. Capturing these features in the calibration produce more accurate water level predictions. Moreover, the downstream boundary condition also has a large effect on the calibrated roughness values near the downstream boundary.
Item Type:Essay (Master)
Clients:
Deltares
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering and Management MSc (60026)
Link to this item:http://purl.utwente.nl/essays/74555
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