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Open AccessArticle

Flow Topology in the Confluence of an Open Channel with Lateral Drainage Pipe

1
Department of Civil and Environmental Engineering and Construction, University of Nevada, Las Vegas, NV 89154, USA
2
U.S. Army Engineer Research and Development Center, Vicksburg, MS 39180, USA
*
Author to whom correspondence should be addressed.
Hydrology 2020, 7(3), 57; https://doi.org/10.3390/hydrology7030057
Received: 5 July 2020 / Revised: 11 August 2020 / Accepted: 12 August 2020 / Published: 15 August 2020
The purpose of this paper is to develop design guidelines for flood control channel height in the vicinity of the confluence of a submerged drainage pipe and a flood control channel. The water exchange in the confluence of an open channel with a lateral drainage pipe produces unique hydraulic characteristics, ultimately affecting the water surface elevation in the channel. An accurate prediction of the water surface elevation is essential in the successful design of a high-velocity channel. By performing several experiments, and utilizing a numerical model (FLOW-3D), this study investigated the impact of submerged lateral drainage pipe discharges into rectangular open channels on flow topology in the confluence hydrodynamics zone (CHZ). The experiments were conducted in different flume and junction configurations and flow conditions. Moreover, the simulations were performed on actual size channels with different channel, pipe, and junction configurations and flow conditions. The flow topology in the CHZ was found to be highly influenced by the junction angle, as well as the momentum ratios of the channel flow and the pipe flow. The findings of this study were used to develop conservative design curves for channel confluences with lateral drainage pipe inlets. The curves can be used to estimate water surface elevation rise in different channel and pipe configurations with different flow conditions to determine the channel wall heights required to contain flows in the vicinity of laterals. View Full-Text
Keywords: flood control channel; open channel; channel and pipe confluence; flow topology; FLOW-3D flood control channel; open channel; channel and pipe confluence; flow topology; FLOW-3D
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MDPI and ACS Style

Nazari-Sharabian, M.; Karakouzian, M.; Hayes, D. Flow Topology in the Confluence of an Open Channel with Lateral Drainage Pipe. Hydrology 2020, 7, 57.

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