Discharge and location dependency of calibrated main channel roughness: Case study on the River Waal

Boyan C.A. Domhof, Koen D. Berends, Aukje Spruyt, Jord J. Warmink, Suzanne J.M.H. Hulscher

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Abstract

To accurately predict water levels, river models require an appropriate description of the hydraulic roughness. The bed roughness increases as river dunes grow with increasing discharge and the roughness depends on differences in channel width, bed level 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 in the Netherlands is used as a case study. Results show that the calibrated roughness is mainly sensitive to discharge. Especially the transition from bankfull to flood stage and effects of floodplain compartmentation are important features to consider in the calibration as these produce more accurate water level predictions. Moreover, the downstream boundary condition also has a large effect on the calibrated roughness values near the boundary.
Original languageEnglish
Article number06038
Number of pages8
JournalE3S Web of Conferences
Volume40
DOIs
Publication statusPublished - 5 Sep 2018
EventRiver Flow 2018: 9th International Conference on Fluvial Hydraulics 2018 - Espace Tête d’Or, Lyon, France
Duration: 5 Sep 20188 Sep 2018
Conference number: 9
https://riverflow2018.irstea.fr/

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roughness
Surface roughness
Rivers
river
Water levels
Discharge (fluid mechanics)
water level
bed roughness
dune
floodplain
boundary condition
hydrodynamics
Sediments
calibration
hydraulics
Hydrodynamics
Hydraulics
Boundary conditions
Calibration
prediction

Cite this

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title = "Discharge and location dependency of calibrated main channel roughness: Case study on the River Waal",
abstract = "To accurately predict water levels, river models require an appropriate description of the hydraulic roughness. The bed roughness increases as river dunes grow with increasing discharge and the roughness depends on differences in channel width, bed level 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 in the Netherlands is used as a case study. Results show that the calibrated roughness is mainly sensitive to discharge. Especially the transition from bankfull to flood stage and effects of floodplain compartmentation are important features to consider in the calibration as these produce more accurate water level predictions. Moreover, the downstream boundary condition also has a large effect on the calibrated roughness values near the boundary.",
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Discharge and location dependency of calibrated main channel roughness: Case study on the River Waal. / Domhof, Boyan C.A.; Berends, Koen D.; Spruyt, Aukje; Warmink, Jord J.; Hulscher, Suzanne J.M.H.

In: E3S Web of Conferences, Vol. 40, 06038, 05.09.2018.

Research output: Contribution to journalConference articleAcademicpeer-review

TY - JOUR

T1 - Discharge and location dependency of calibrated main channel roughness: Case study on the River Waal

AU - Domhof, Boyan C.A.

AU - Berends, Koen D.

AU - Spruyt, Aukje

AU - Warmink, Jord J.

AU - Hulscher, Suzanne J.M.H.

PY - 2018/9/5

Y1 - 2018/9/5

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AB - To accurately predict water levels, river models require an appropriate description of the hydraulic roughness. The bed roughness increases as river dunes grow with increasing discharge and the roughness depends on differences in channel width, bed level 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 in the Netherlands is used as a case study. Results show that the calibrated roughness is mainly sensitive to discharge. Especially the transition from bankfull to flood stage and effects of floodplain compartmentation are important features to consider in the calibration as these produce more accurate water level predictions. Moreover, the downstream boundary condition also has a large effect on the calibrated roughness values near the boundary.

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