第４部門②

[2D05-08-02] Fundamental Study on Application of the 2-D and 3-D Hybrid Flow Model to the Riverbed Variation Analysis

*Kengo Osada¹, Yoshihiko Shimizu², Suzuka Isaka³, Genki Hoshida⁴ (1. NIT, Anan College, 2. Gunma University, 3. NIT, Anan College, 4. MLIT, Nakagawa River Office)

Keywords:Bed Variation, Flood Flow, Spur Dike

A new numerical model for riverbed variation analysis based on alternatively calculating 3D and 2D flow fields with mode-splitting techniques, the hybrid flow model, was developed. This model was applied to evaluate the riverbed change around spur dike caused by floods from 2018 to 2019 in the Naka River. Calculation results showed the new model’s superiority compared to the conventional 2D model using detailed topographic survey data by ALB.