为了控制饮用水分配系统中的细菌污染风险，通常在生产点注入消毒剂，以确保整个分配系统中有足够的残留。为此，消毒必须保持在最低速度，以限制消毒副产物的形成。当一个水网被供应各种质量的混合水时，这种权衡就更加复杂了。由于水力、水质或经济原因，在配水系统中选择多源混合的趋势越来越大。本研究的目的是评估不同来源的混合水对分布式水质的影响。为了研究这一问题，选择了法国诺曼底卡昂市（11.4万居民）的管网，因为其中一个分布区供应两种不同来源和质量的水: 经过处理的地表水和氯化的地下水。本研究使用水力建模软件SynerGEE Water对氯的衰减进行建模。本文介绍了冬季和夏季现场试验的方法和结果，这些试验允许对余氯进行建模。它展示了如何开发一种创新方法，并成功应用于复杂的配电系统，以帮助网络运营商优化消毒策略。包括7个参考文献、表格、图表。

In order to control the risk of bacterial contamination in drinking water distribution systems, disinfectant is generally injected at the production point to ensure a sufficient residual throughout the distribution system. In doing this, disinfection must be kept at a minimum rate to limit the formation of disinfection byproducts. This trade-off is even more complex to deal with, when a network is supplied with mixed waters of various qualities. There is an increasing tendency to choose multi-source mixing within a distribution system for hydraulic, water-quality or economical reasons. The objective of this study was to evaluate the impact of mixing waters of various origins on the distributed water quality. To study this issue, the network of the City of Caen in Normandy (114,000 inhabitants), France was chosen because one of its distribution areas is supplied with two types of water of various origins and qualities: a treated surface water and a chlorinated groundwater. The hydraulic modelling software SynerGEE Water was used for this study to model the chlorine decay. This paper addresses the methodology and the results of winter and summer field tests which permitted the modelling of the chlorine residual. It shows how an innovative method has been developed and successfully applied to a complex distribution system to help the network operator optimize the disinfection strategy. Includes 7 references, tables, figures.