Publication detail

Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs

ŘÍHA, J. DUCHAN, D. ZACHOVAL, Z. ERPICUM, S. ARCHAMBEAU, P. PIROTTON, M. DEWALS, B.

Original Title

Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs

Type

journal article in Web of Science

Language

English

Original Abstract

Shallow-water models are standard for simulating flow in river systems during floods, including in the nearfield of sudden changes in the topography, where vertical flow contraction occurs such as in case of channel overbanking, side spillways or levee overtopping. In the case of stagnant inundation and for frontal flow, the flow configurations are close to the flow over a broad-crested weir with the trapezoidal profile in the flow direction (i.e. inclined upstream and downstream slopes). In this study, results of shallow-water numerical modelling were compared with seven sets of previous experimental observations of flow over a frontal broad-crested weir, to assess the effect of vertical contraction and surface roughness on the accuracy of the computational results. Three different upstream slopes of the broad-crested weir (V:H = 1:Z(1) = 1:1, 1:2, 1:3) and three roughness scenarios were tested. The results indicate that, for smooth surface, numerical simulations overestimate by about 2 to 5% the weir discharge coefficient. In case of a rough surface, the difference between computations and observations reach up to 10%, for high relative roughness. When taking into account mentioned the differences, the shallow-water model may be applied for a range of engineering purposes.

Keywords

Discharge coefficient; Frontal broad-crested weir; Shallow flow modelling; Rough weir crest

Authors

ŘÍHA, J.; DUCHAN, D.; ZACHOVAL, Z.; ERPICUM, S.; ARCHAMBEAU, P.; PIROTTON, M.; DEWALS, B.

Released

19. 12. 2019

Publisher

VEDA, SLOVAK ACAD SCIENCES

Location

BRATISLAVA

ISBN

0042-790X

Periodical

Journal of Hydrology and Hydromechanics

Year of study

67

Number

4

State

Slovak Republic

Pages from

322

Pages to

328

Pages count

7

URL

http://www.uh.sav.sk/jhh/Find-Issues/All-Issues?kod=67,4

Full text in the Digital Library

http://hdl.handle.net/11012/200893

BibTex

@article{BUT163283,
  author="Jaromír {Říha} and David {Duchan} and Zbyněk {Zachoval} and Sébastien {Erpicum} and Pierre {Archambeau} and Michel {Pirotton} and Benjamin {Dewals}",
  title="Performance of a shallow-water model for simulating flow over trapezoidal broad-crested weirs",
  journal="Journal of Hydrology and Hydromechanics",
  year="2019",
  volume="67",
  number="4",
  pages="322--328",
  doi="10.2478/johh-2019-0014",
  issn="0042-790X",
  url="http://www.uh.sav.sk/jhh/Find-Issues/All-Issues?kod=67,4"
}