Articles | Volume 25, issue 8
https://doi.org/10.5194/nhess-25-2699-2025
https://doi.org/10.5194/nhess-25-2699-2025
Research article
 | 
14 Aug 2025
Research article |  | 14 Aug 2025

Transformations in exposure to debris flows in post-earthquake Sichuan, China

Isabelle Utley, Tristram Hales, Ekbal Hussain, and Xuanmei Fan

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Cited articles

Ao, Y., Huang, K., Wang, Y., Wang, Q., and Martek, I.: Influence of built environment and risk perception on seismic evacuation behaviour: Evidence from rural areas affected by Wenchuan earthquake, Int. J. Disast. Risk Re., 46, 101504, https://doi.org/10.1016/j.ijdrr.2020.101504​​​​​​​, 2020. 
Arrogante-Funes, P., Bruzón, A. G., Arrogante-Funes, F., Ramos-Bernal, R. N., and Vázquez-Jiménez, R.: Integration of vulnerability and hazard factors for landslide risk assessment, Int. J. Env. Res. Pub. He., 18, 11987, https://doi.org/10.3390/ijerph182211987 2021. 
Bernard, M., Boreggio, M., Degetto, M., and Gregoretti, C.: Model-based approach for design and performance evaluation of works controlling stony debris flows with an application to a case study at Rovina di Cancia (Venetian Dolomites, Northeast Italy), Sci. Total Environ, 688, 1373–1388, https://doi.org/10.1016/j.scitotenv.2019.06.302, 2019. 
Chang, M., Luo, C., Wu, B., and Xiang, L.: Catastrophe process of outburst debris flow triggered by the landslide dam failure, J. Hydrol., 609, 127729, https://doi.org/10.1016/j.jhydrol.2022.127729, 2022. 
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We analysed debris flows in Sichuan, China, using satellite data and simulations to assess check dam efficacy. Our study found that while check dams can mitigate smaller flows, they may increase exposure to extreme events, with up to 40 % of structures in some areas affected. Urban development and reliance on check dams can create a false sense of security, increasing exposure during large debris flows and highlighting the need for risk management and infrastructure planning in hazard-prone areas.
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