Author(s): P. A. M. Hedberg; J. G. I. Hellstrom; A. G. Andersson
Linked Author(s):
Keywords: Spillway; Spillways; Open Channel; Validation and Verification; Non-ideal approach flow
Abstract: This experimental work on discharge capacity investigates the flow distribution in a down-scaled multi-outlet hydraulic rig, in addition to deriving how different geometrical and hydraulic parameters affect spillway capacity. Water is pumped into a 5 m long channel, passing through a honeycomb to even out the flow. At the end of the channel is a spillway with three 0.3 meter wide outlets. The water passing over each individual outlet is gathered and measured separately by collecting it into a large tank suspended on weight cells. This is repeated to ensure repeatability of the mass flow measurement method. To investigate impact of water level two inlet flows are tested, 90 and 130 l/s. The findings show that for a larger inflow, and thus higher water level, the discharge distribution over the spillway gets exacerbated by increasing the relative differences in the flow through each outlet. The differences in the measured water levels also increase. Finally, comparisons are made to previous experiments of similar setups indicating that a larger water column under the crest of the spillway reduces risk of uneven flow distribution for a spillway with multiple outlets. The data presented can, along with dimensions of the model, be used as a case study to validate how well different computational methods can predict flow distribution and spillway capacity.
Year: 2024