Quantitative risk assessment and eco-engineering mitigation strategies for debris flows utilizing dynamic process simulation in Shuzheng gully, Jiuzhaigou valley scenic and historic interest area

A novel pine pile–gabion composite dam (PPGD) system, integrated with dynamic process simulation and adaptive eco-engineering strategies, effectively mitigates debris flow risks while preserving ecological integrity. Using high-resolution modeling, researchers simulated debris flows under 20- and 50-year rainfall return periods in Shuzheng gully, Jiuzhaigou Valley, revealing peak velocities of 6.49 m/s and discharges of 38.33 m³/s for the latter. The PPGD system reduced total inundation extent by 45.78% and decreased peak flow velocities downstream by up to 45.34%, demonstrating its potential for sustainable risk management in ecologically sensitive UNESCO World Heritage sites. This approach balances risk reduction with environmental conservation, offering a scalable solution for mountain areas vulnerable to debris flows.

Yang, D., Zong, X., Wu, B., Wang, Y., Liang, B., Wan, F., Liu, J., & Peng, J. (2025). Quantitative risk assessment and eco-engineering mitigation strategies for debris flows utilizing dynamic process simulation in Shuzheng gully, Jiuzhaigou valley scenic and historic interest area. Frontiers in Earth Science, 13. https://doi.org/10.3389/feart.2025.1649068