Unraveling the rainfall-waterlogging propagation lag in urban systems: mechanisms, response patterns, and source tracking evidence - Baojun Guan; Jingming Hou; Donglai Li; Yanhong Wang; Xinxin Pan; Jiahao Lv; Chenchen Fan; Guangzhao Chen; Liping Ma; Tian Wang (Journal of Hydrology, 2026)