ABSTRACT

Water companies have been working to introduce strategies to reduce discolouration customer contacts via non-specialist ‘business as usual’ practices. A greater understanding of discolouration material behaviour, however, is still needed to accurately inform the mobilisation response and regeneration rates in mains of different materials. The Variable Condition Discolouration Model (VCDM) that tracks both accumulation and mobilisation processes has been validated in some pipe materials using long-term time series data. This paper investigates calibration for a 15 km cast iron (CI) main, using daily turbidity responses with VCDM parameter sensitivity and temporal stability investigated using a statistical approach comparing three periods of the data.

Results highlight the VCDM as widely applicable to determine long-term discolouration behaviour and improve behavioural understanding. In this case, analysis of different time periods indicates flow-conditioning not only improves network resilience but can also reduce mobilisation rates and discolouration risk.

摘要

自来水公司一直在努力采取策略，通过非专家的“照常营业”做法减少与客户的联系。然而，仍然需要对变色材料的行为有更深入的了解，以准确告知不同材料的电源中的动员响应和再生速率。跟踪长期积累和迁移过程的可变条件变色模型（VCDM）已在某些管道材料中使用长期时间序列数据进行了验证。本文研究了15 km铸铁（CI）主管道的标定，使用每日浊度响应和VCDM参数灵敏度，以及使用统计方法比较三个时期的数据研究的时间稳定性。

结果表明VCDM可广泛用于确定长期变色行为并改善行为理解。在这种情况下，对不同时间段的分析表明，流量调节不仅可以提高网络弹性，还可以降低移动率和变色风险。