Urban Blue Spaces are often treated as a part of Urban Green Infrastructure (UGS). However, the recognition of blue infrastructure as a linked but at the same time separate part of the UGS network is important, since water itself has many values while also posing a range of risks. In this study we identified 427 blue spaces within the administrative border of the city of Warsaw, Poland. We characterised these cases from the perspective of users: their connection, interaction and potential use of the water bodies. Based on a cluster analysis (using PCA and k-mean methods) we distinguished three main clusters of water bodies and from this we created a typology of Warsaw urban water, especially focusing on the importance and potential of abandoned, forgotten and unmanaged (invisible) urban blue spaces. We conclude that the recognition of types and patterns of blue areas in the city provides a good basis for city and local level design decisions for maximising the potential for human-water interactions. This knowledge enhances the potential of the integrated UGS which should be re-named as Urban Blue-Green Infrastructure in order to recognise the particular role of water.

城市蓝色空间通常被视为城市绿色基础设施 (UGS) 的一部分。然而，将蓝色基础设施视为 UGS 网络的一个相互关联但同时又独立的部分很重要，因为水本身具有许多价值，同时也带来一系列风险。在这项研究中，我们在波兰华沙市的行政边界内确定了 427 个蓝色空间。我们从用户的角度对这些案例进行了描述：他们对水体的联系、互动和潜在用途。基于聚类分析（使用 PCA 和 k 均值方法），我们区分了三个主要的水体集群，并从中创建了华沙城市水的类型，特别关注被遗弃、被遗忘和未管理（不可见）的重要性和潜力城市蓝色空间。我们得出的结论是，对城市蓝色区域类型和模式的识别为城市和地方层面的设计决策提供了良好的基础，以最大限度地发挥人与水相互作用的潜力。这些知识增强了综合 UGS 的潜力，应将其重新命名为城市蓝绿基础设施，以认识到水的特殊作用。