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On Dam-Break Flow Routing in Confluent Channels.

Sihan Chen¹, Yingjin Li², Zhong Tian¹

¹State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China.

International Journal of Environmental Research and Public Health

|November 14, 2019

Summary

Investigating dam-break floods in confluent channels reveals that increasing the confluence angle significantly delays flood arrival and reduces peak discharge. This research offers crucial insights into flood routing dynamics at channel junctions.

Keywords:

abatement confluent channel dam-break flood numerical simulation physical testing retardation

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Area of Science:

Hydraulics
Fluid Mechanics
Environmental Engineering

Background:

Dam-break flow routing in confluent channels is understudied.
Confluence geometry significantly influences flood wave propagation.

Purpose of the Study:

To investigate the impact of varying confluence angles on dam-break flood routing.
To analyze the effects of confluence on flood wave retardation and abatement.

Main Methods:

Physical experiments in smooth, rectangular channels.
Numerical simulation of dam-break flow.
Image processing for flow velocity measurement.
Particle image velocimetry for surface flow field capture.

Main Results:

Increased confluence angle delays flood arrival (0.91%–21.18%) and reduces peak discharge (9.05%–58.36%).
Higher angles shift impact points upstream and reduce impact range.
Flow dynamics at confluence involve impact-reflection-return-attenuation.

Conclusions:

Confluence angle is a critical factor in dam-break flood routing.
Findings enhance understanding of flood hazard mitigation at channel confluences.