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Flow rate influence on sediment depth estimation in sewers using temperature sensors
Universidade da Coruña, Water and Environmental Engineering Group (GEAMA), Centro de Innovación Tecnolóxica en Edificación e Enxeñaría Civil (CITEEC), A Coruña, Spain.
The University of Sheffield, Sheffield, UK.
The University of Sheffield, Sheffield, UK.
Delft University of Technology, Delft, The Netherlands.
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2024 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732Article in journal (Refereed) Epub ahead of print
Abstract [en]

Enhancing sediment accumulation monitoring techniques in sewers will enable a better understanding of the build-up processes to develop improved cleaning strategies. Thermal sensors provide a solution to sediment depth estimation by passively monitoring temperature fluctuations in the wastewater and sediment beds, which allows evaluation of the heat-transfer processes in sewer pipes. This study analyses the influence of the flow conditions on heat-transfer processes at the water-sediment interface during dry weather flow conditions. For this purpose, an experimental campaign was performed by establishing different flow, temperature patterns, and sediment depth conditions in an annular flume, which ensured stable flow and room-temperature conditions. Numerical simulations were also performed to assess the impact of flow conditions on the relationships between sediment depth and harmonic parameters derived from wastewater and sediment-bed temperature patterns. Results show that heat transfer between water and sediment occurred instantaneously for velocities greater than 0.1 m/s, and that sediment depth estimations using temperature-based systems were barely sensitive to velocities between 0.1 and 0.4 m/s. A depth estimation accuracy of +/- 7 mm was achieved. This confirms the ability of using temperature sensors to monitor sediment build-up in sewers under dry weather conditions, without the need for flow monitoring.

Place, publisher, year, edition, pages
IWA Publishing, 2024.
Keywords [en]
annular flume, heat-transfer processes, sediment transport, temperature sensing, urban drainage systems
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-106120DOI: 10.2166/wst.2024.193ISI: 001237453500001OAI: oai:DiVA.org:ltu-106120DiVA, id: diva2:1867840
Funder
EU, Horizon 2020, 101008626
Note

Funder: Xunta de Galicia (Conselleria de Cultura, Educacion e Universidade) (ED481B-2021-082); 

Full text license: CC BY 4.0; 

Available from: 2024-06-11 Created: 2024-06-11 Last updated: 2024-06-11

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Viklander, MariaLundy, Lian

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2122232425262724 of 79
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