Study on Waterlogging Reduction Effect of LID Facilities in Collapsible Loess Area Based on Coupled 1D and 2D Hydrodynamic Model

The accurate evaluation method of LID toward the attenuation urban flood is still a hot issue. This paper focuses on coupled 1D and 2D hydrodynamic model, investigating model parameters set in collapsible loess area, changes surface runoff, waterlogged drainage network indicators under different rainfall patterns. results show that can effectively simulate effect facilities unaltered retrofitted conditions. It found infiltration area are higher than other eastern cities by calibration validation. After implementing facilities, total peak flow, runoff coefficient, pressure patterns have all been reduced. With increases return period, waterlogging reduction would gradually weaken. period has great impact capacity. coefficient relatively big pipelines, such as proportion overflow nodes, fully loaded average full-load duration. duration major quantity,