黄土丘陵沟壑区小流域小型浅层滑坡对降雨和下垫面的响应

doi:10.16843/j.sswc.2022241

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Abstract Background Since the beginning of the 21st century，the global extreme weather has become normal，leading to frequent landslides，debris flows and other disasters have become a new normal. With the global climate change，extreme rainstorm events occur frequently，leading to more landslides in mountainous areas. Rainstorm events lead to frequent landslides. Understanding the occurrence and distribution of rainfall-based landslides in small watersheds can provide a decision-making basis for soil erosion prevention，rational disaster prevention and mitigation，and an effective guarantee of people’s life and property safety. Methods Based on the daily precipitation data of the Fangta watershed in 2013 and 2020，the characteristics of rainfall inducing landslide in these two years were analyzed. Combined with remote sensing and geographic information system technologies，the distribution characteristics of rainfall-type landslides were obtained by interpreting high-resolution images before and after the landslides occurred in the past two years. Descriptive statistics were used to study the response of different rainfall characteristics and underbed to the number and scale of landslides，and the characteristics of landslide recurrence were discussed. Results 1) The main rainfall processes that induced landslides in 2013 were characterized by large accumulative rainfall，long rainfall duration，heavy rainfall frequency，and short interval. In 2020，there were more rainfall events but low rainfall intensity and few rainstorm times but more rainstorms amount in a single day. 2) The landslides that occurred in these two years were mainly small shallow landslides. The landslide scale in 2013 was large，and that in 2020 was small. The landslide erosion modulus in the two years was 6428.24 t/km² and 4197.40 t/km². 3) The slope with gradient of ≥30°-50° and the elevation interval of 1100-1 250 m are highly sensitive areas of landslides. There are more landslides in the forest and shrub areas，and the closer the distance to the road，the greater the possibility of landslides. 4) 21.9% of the landslides in the basin had a recurrence，some of them had multiple small-scale recurrences and nearly 90% of them had reduced recurrence area. Conclusions The heavier and longer the rainfall，the more likely it is to cause landslides，and the steeper the slope and the more frequent the human activity in the area，the greater the likelihood of landslides. This study may provide a valuable reference basis for landslide erosion disasters caused by heavy rain in small watershed in the hilly-gully region of the Loess Plateau.

Key words： small watershed heavy rain scale of landslide landform land use recurrence of landslide

Received: 10 December 2022

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X43

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	Articles by authors
	LI Mengmeng
	JIAO Juying
	YAN Xiqin
	XU Qian
	ZHAO Wenting
	JIANG Xiaohan
	ZHANG Ziqi
	QI Hongkun
	ZHANG Zhixin
	WANG Haolin

Cite this article:

LI Mengmeng,JIAO Juying,YAN Xiqin, et al. Responses of small shallow landslide to rainfall and underlying surface of the small watershed in the loess hilly-gully region[J]. SSWC, 2025, 23(1): 31-39.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022241 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2025/V23/I1/31

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