Linear-Momentum Flux to Overbank Sections

by Robert R. Wright, (M.ASCE), Chairman of the Water Div.; Water and Wastewater Tech. Sch., Neosho, MO,
Marion R. Carstens, (M.ASCE), Prof.; Georgia Inst. of Technol., Atlanta, GA,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 9, Pg. 1781-1793

Document Type: Journal Paper

Discussion: Posey Chesley J. (See full record)
Discussion: Malhotra Gurbachan P. (See full record)

Abstract: On the basis of experiments in two joined rectangular channels, transfer of linear momentum from the major (less restricted) channel to the minor (more restricted) channel has been demonstrated. The apparent-shear stress on the junction surface was found to be of the same order of magnitude as the boundary-shear stress in the major channel. Based upon this observation, a method for engineering calculations for mean-flow characteristics in joined channels such as a river at flood stage is proposed. The steps in the proposed separate-channel method of analysis are: (1) considering the major-channel boundary including the junction plane as a solid boundary, compute the mean boundary-shear stress on the major-channel boundary; (2) compute the apparent-shear force on the junction surface using the mean boundary-shear stress of the major channel; and (3) incorporate the apparent-shear force on the junction surface as a propulsive force on the minor-channel flow.

Subject Headings: Boundary shear | Stress analysis | Domain boundary | Linear functions | Overland flow | Professional societies | Floods | Solids flow |

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