Using Climate Change Scenarios and Hydraulic Modeling to Study Bridge Scouring

Abstract Submission: In Taiwan, extreme rainfall has caused severe sedimentation and scour problems over the rivers. That results in significant changes in river topography and flow paths. Based on the Water Resources Agency of Taiwan, the Wu River basin faces the problems of overflow, erosion, flooding, hydraulic structure failure, embankment structures damage, and changes in ecological environments. To address these concerns, the study integrates United Nations climate change scenarios (AR6), hydrological modeling (HEC-HMS), and river hydraulic bed modeling (SRH-2D) to simulate sediment transport in the river. The analysis used different climate change scenarios, examining how upstream inflow and sediment transport quantities change correspond to river channel evolution and sediment deposition variations. The climate change scenarios are based on the AR6 CMIP6 SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5. The study utilizes HEC-HMS to calculate boundary inflow and employ the SRH-2D model to simulate sediment movement in the river, with varying inflow rates and sediment transport amounts, to analyze the changes in sediment transport. Based on the simulation results, the pathways of channel changes are examined, and the amount of sediment deposition in the river channel is quantified. The simulation results are then provided as references for evaluating the safety of hydraulic structures, conducting ecological assessments, and simulating urban flooding, among other relevant fields.

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