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Effect of blocked sediments on flow characteristics and associated backwater effect in drainage pipes

Authors :
Bin Sun
An Tong
Runzhi Yang
Shizhe Chen
Zhiwei Li
Source :
Water Science and Technology, Vol 85, Iss 12, Pp 3465-3478 (2022)
Publication Year :
2022
Publisher :
IWA Publishing, 2022.

Abstract

The study of hydraulic characteristics of water flow affected by blocked sediment is vital to assess discharge capacity in pipes with sediment sand to understand the process of pollutant and fine sand aggregation. The aim of this paper is to study the blocking effect of permeable sediments on non-full flow in circular pipe and to analyze hydraulic characteristics with backwater. Experiments and numerical simulations were performed and the porous media model is used to simulate the flow in permeable blocked sediments. To evaluate the degree of congestion, the backwater ratio β is proposed. The backwater ratio is positively proportional to blocked sediment height and inversely proportional to blocked sediment particle size and flow value. Cross-sectional velocity in the backwater zone decreases significantly and tends to be uniform as backwater ratio increases. Furthermore, the development of secondary flows and velocity distributions influenced by backwater height is discussed. The dimensionless shear velocity in backwater zone shows an exponential decrease as the backwater ratio increases, which greatly increases the possibility of further sediment deposition. HIGHLIGHTS The backwater ratio β is proposed to evaluate the effect of blocked sediment and to study the relationship between backwater height and blockage parameters.; The porous media model is used to simulate the flow in permeable blocked sediments.; The changes of flow field are observed under different backwater ratio.;

Details

Language :
English
ISSN :
02731223 and 19969732
Volume :
85
Issue :
12
Database :
Directory of Open Access Journals
Journal :
Water Science and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.7d182967afdc4399a1901a8244bf9e9d
Document Type :
article
Full Text :
https://doi.org/10.2166/wst.2022.181