Understanding and managing discolouration risk in trunk mains

WATER RESEARCH

卷:107

Article

Husband, S.¹  Boxall, J.¹ 

[1] Univ Sheffield, Dept Civil & Struct Engn, Sheffield S1 3JD, S Yorkshire, England

关键词: Discolouration;    Trunk mains;    Material layers;    Shear stress;    Modelling;    Water quality;   

DOI  :  10.1016/j.watres.2016.10.049

来源: Elsevier

【 摘 要 】

There is currently no accepted concept or approach for understanding and controlling discolouration risk associated with trunk mains. This paper assesses the applicability of cohesive layer theories to manage discolouration and a steady state empirical modelling tool that describes the process of particulate material accumulation. Results are presented from independent field experiments across the UK and internationally that evidence hydraulically induced mobilisation, or effectively cleaning, once imposed system shear stress exceeds normal conditions. Model calibration to measured data validates the cohesive layer concept with transferability in empirically derived parameters demonstrating a viable operational planning tool. The experiments highlight the accumulation of material layers as a continuous and ubiquitous process, such that fully clean pipes can never exist and helping explain how discolouration risk changes over time. A major practical implication of the novel understanding demonstrated in this paper is that discolouration risk in trunk mains can be simply managed by pro-active strategies that regularly vary the hydraulic conditions. This avoids the need for disruptive and expensive out of service invasive interventions yet offers operators a cost-effective long-term strategy to safeguard water quality. (C) 2016 The Author(s). Published by Elsevier Ltd.

【 授权许可】

Free