Open Channel Expansions Fitted with Local Hump

by Amruthur S. Ramamurthy, Asst. Prof., Civ. Engr.; Sir George Williams Univ., Montreal, Quebec, Canada,
Sanjay Basak, Grad. Student; Ind. Inst. of Sci., Bangalore, India,
Pattabhi Rama Rao, (A.M.ASCE), Grad. Student; Ind. Inst. of Sci., Bangalore, India,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 5, Pg. 1105-1113

Document Type: Journal Paper


A local rise in the floor level of an open channel expansion permits the deceleration of the flow in a transition structure to occur over a longer length of the expansion. This in turn reduces the adverse pressure gradient to which the flow is subjected while entering the wider channel downstream of the transition structure. Test data are presented indicating that a local hump set in the bottom profile of the expansion decreases the incidence of flow separation and hence lowers the erosive attack on the bed and sides of the channel downstream of the expansion.

Subject Headings: Rivers and streams | Open channel flow | Flow profiles | Flow separation | Floors | Open channels | Permits | Pressurized flow

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