Vol16 No.6: 1289-1299

【Title】Magnitude-frequency relationship of debris flows in the Jiangjia Gully, China

【Author】GAO Yan-chao^1,2,3; CHEN Ning-sheng¹*; HU Gui-sheng¹; DENG Ming-feng

【Addresses】1 Key Laboratory of Mountain Hazards and Land Surface Process, Institute of Mountain Hazards and Environment, CAS, Chengdu 610041，China; 2 Chengdu Center, China Geological Survey, Chengdu 610081, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China

【Corresponding author】CHEN Ning-sheng

【Citation】Gao YC, Chen NS, Hu GS, et al. (2019) Magnitude-frequency relationship of debris flows in the Jiangjia Gully, China. Journal of Mountain Science 16(6). https://doi.org/10.1007/s11629-018-4877-6

【DOI】https://doi.org/10.1007/s11629-018-4877-6

【Abstract】The magnitude-frequency (MF) relationship of debris flows is the basis for engineering designs and risk quantification. However, because of the lack of debris flow monitoring data, research progress in this area has been relatively slow. The MF relationship of debris flows in Jiangjia Gully, Yunnan Province was evaluated based on a regression analysis of 178 debris flow events that occurred from 1987-2004. The magnitude-cumulative frequency (MCF) relationship of the debris flows in the Jiangjia Gully is consistent with the linear logarithmic transformation function. Moreover, observed data for debris flows in Hunshui Gully of Yunnan Province and Huoshao Gully, Liuwan Gully, and Niwan Gully of Gansu Province were used to verify the function. The results showed that the MCF relationship of high-frequency debris flows is consistent with the power law equation, although the regression coefficients in the equation are considerably different. Further analysis showed a strong correlation between the differences in the constants and the drainage area and daily maximum precipitation.

【Keywords】Debris flow; Magnitude; Cumulative frequency; Drainage area; Precipitation; Jiangjia Gully