Field Experiment and Numerical Simulation Study on the Erosion Resistance Performance of Spur Dikes with Soil-Cement Protection

On April 23, 2024, this study conducted an experiment on the impact of dam-breach flood on spur dikes to explore the anti-erosion effect of soil-cement surface protection on spur dikes. The test site was located downstream of Landao creek in Huisun Forest in Nantou County, Taiwan where three spur dikes were constructed using soil from the riverbed. Soil-cement was applied to the upstream slope faces of the spur dikes to enhance their erosion resistance. This study monitored seismic and acoustic signals during the erosion process then used Hilbert-Huang Transform (HHT) for time-frequency analysis to investigate the signal characteristics of spur dikes under erosion. We used the iRIC Nays2DH program to simulate the erosion of spur dikes, inputting the digital elevation model (DEM) before the experiment for calculations. The simulation results were compared with the DEM after the experiment. We also conducted several scenario numerical simulations to explore the anti-erosion benefits of spur dikes with different angles and lengths.