Study on Conveyance Coefficient Influenced by Momentum Exchange Under Steady and Unsteady Flows in Compound Open Channels

Hamidreza Rahimi, Saiyu Yuan (), Xiaonan Tang, Chunhui Lu, Prateek Singh and Fariba Ahmadi Dehrashid
Additional contact information
Hamidreza Rahimi: Hohai University
Saiyu Yuan: Hohai University
Xiaonan Tang: Xi’an Jiaotong-Liverpool University
Chunhui Lu: Hohai University
Prateek Singh: Xi’an Jiaotong-Liverpool University
Fariba Ahmadi Dehrashid: Bu-Ali Sina University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2022, vol. 36, issue 7, No 4, 2179-2199

Abstract: Abstract Many natural compound channels with differential stages play a vital role during high flow events in real-time. When a flood occurs, and water flows into floodplains, the flow structure becomes more complex because of the momentum transfer between sub-segments of the compound channel, caused by the large difference of velocities in different sub-segments. The conventional methods of discharge calculation based on conveyance coefficients of a single channel do not consider momentum transfer, resulting in inaccurate prediction for compound channels. This paper uses a new method of determining conveyance coefficient in compound channels to be incorporated in the two-dimensional analytical solution of the Reynolds averaged Navier–stokes equations for stage-discharge and hydrographs prediction. The proposed conveyance model for flood routing is obtained by solving 1D unsteady flow equations. The flow calculation considers the interaction between sub-segments of compound channels using the momentum equation for shallow water. The proposed model was evaluated to show that incorporating the momentum flux improves the predicted maximum discharge and flow depth in the output hydrographs of the unsteady flow. This result suggests that the proposed method can effectively determine the conveyance coefficient of the compound channel in steady and unsteady flow prediction.

Keywords: Steady and unsteady flows; Conveyance coefficient; Compound open channel; Stage-discharge; Flood routing; Hydrographs (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
http://link.springer.com/10.1007/s11269-022-03130-3 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:waterr:v:36:y:2022:i:7:d:10.1007_s11269-022-03130-3

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/11269

DOI: 10.1007/s11269-022-03130-3

Access Statistics for this article

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA) is currently edited by G. Tsakiris

More articles in Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA) from Springer, European Water Resources Association (EWRA)
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().