Repositorio
Institucional

Hu, Guisheng

Tian, Shufeng

Chen, Ningsheng

Rahman, Mahfuzur

Han, Zheng

Somos-Valenzuela, Marcelo

Habumugisha, Jules Maurice

Extreme climate and tectonic controls on the generation of a large-scale, low-frequency debris flow

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CATENA

en

Low-frequency heavy rainfall events commonly trigger debris flows. However, it is not currently understood how high-frequency, light rainfall can trigger giant catastrophic debris flow events with return periods of greater than 100 years, for example, the 2014 event in the Erkazi gully (EKZG), Danba County, Sichuan Province, China. This study uses the EKZG debris flow as a case study to determine the main factors controlling the formation of low-frequency debris flows and their generation by high-frequency light rainfall through field investigations, indoor and outdoor experiments, simulated calculations, and statistical analysis. We revealed that the soil mass predominantly controlled the generation of the EKZG debris flow. Moreover, internal geological factors such as earthquakes and external geological factors such as dry-wet cycles and freeze-thaw erosion likely dominated the EKZG debris flow formation process. In contrast, the geomorphological characteristics, basaltic columnar jointing, and earthquakes jointly determined the amplification process of the debris flow. Furthermore, we discussed the critical role of community-based warning systems during debris flow disasters. For example, early identification of the blocking characteristics of the EKZG debris flow by observers enabled the successful real-time evacuation of 651 people. The following recommendations are proposed: (1) future research should focus on the dynamic replenishment process of the soil mass through dry-wet and freeze-thaw cycles, and (2) the effectiveness and applicability of community-based warning systems should be improved for the prevention and mitigation of geological hazards.

artículo original

This study was financially supported by the National Natural Science Foundation of China (Grant No. 41861134008) , the Youth Innovation Promotion Association CAS (ID: 2020367) , the National Natural Science Foundation of China (Grant No. U20A20110) and the Second Tibetan Plateau Scientific Expedition and Research Program (Grant No. 2019QZKK0902) . Dr. Somos-Valenzuela is funded by the Chilean Na-tional Agency of Research and Development (ANID in Spanish) through the Program of International Cooperation (PCI in Spanish, Grant No. PII-180008) . Thanks to Sichuan Geological Engineering Survey Research Institute Group Co. LTD for their support and help in the investigation.

Este estudio fue apoyado financieramente por la Fundación Nacional de Ciencias Naturales de China (Subvención No. 41861134008), la Asociación de Promoción de la Innovación Juvenil CAS (ID: 2020367), la Fundación Nacional de Ciencias Naturales de China (Subvención No. U20A20110) y la Segunda Meseta Tibetana Programa de Investigación y Expedición Científica (Subvención No. 2019QZKK0902). El Dr. Somos-Valenzuela es financiado por la Agencia Nacional de Investigación y Desarrollo de Chile (ANID) a través del Programa de Cooperación Internacional (PCI, Beca No. PII-180008). Gracias a Sichuan Geological Engineering Survey Research Institute Group Co. LTD por su apoyo y ayuda en la investigación.

10.1016/j.catena.2022.106086

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Low-frequency debris flow

Soil mass

Dry-wet cycle

Geomorphology

Earthquake

FREEZING/THAWING INDEX VARIATIONS

WATER REPELLENCY

SOIL

LANDSLIDES

EARTHQUAKE

MECHANISM

DROUGHT

SICHUAN

POSTEARTHQUAKE

INITIATION

Geociencias

Multidisciplinaria

ciencia del suelo

Recursos hídricos

Flujo de escombros de baja frecuencia

Masa de suelo

Ciclo seco-húmedo

Geomorfología

Terremoto

VARIACIONES DEL ÍNDICE DE CONGELACIÓN/DEScongelación

REPELECIÓN DEL AGUA

SUELO

DESLIZAMIENTOS DE TIERRA

TERREMOTO

MECANISMO

SEQUÍA

SICHUAN

POSTERREMOTO

INICIACIÓN

Extreme climate and tectonic controls on the generation of a large-scale, low-frequency debris flow

artículo original

version publicada

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metadata

metadata

ANID PII-180008

YIPA 2020367

NSFC 41861134008

NSFC U20A20110 2019QZKK0902

WOS:000790439100002