23 Apr 2019
 | 23 Apr 2019
Status: this discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.

Landslides distribution at tributaries with different evolution stages in Jiangjia Gully, southwestern China

Xia Fei Tian, Yong Li, Quan Yan Tian, and Feng Huan Su

Abstract. Jiangjia Gully (JJG) is known for its high frequency and variety of debris flows, especially the intermittent surges of various flow regimes and materials. Observation indicates that the surges come from various tributaries with different landslides activities. In this study, 81 tributaries of JJG are taken from DEM with 10 m grid cells, and the hypsometric curves are used to characterize their evolution stages; five stages are identified by the evolution index (EI, the integral of the hypsometric curves) and most tributaries are in relative youth stage with EI between 0.5 and 0.6. Then 908 landslides are interpreted from Quickbird satellite image of 0.61 m resolution, and it is found that LD (LD = landslides number in a tributary/the tributary area) increases exponentially with EI, while LAp (LAp = landslides area in a tributary/the tributary area) fluctuates with EI, meaning that landslides are inclined to occur in tributaries with EI between 0.5 and 0.6, and thus these tributaries are the main material sources supplying for debris flows.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Xia Fei Tian, Yong Li, Quan Yan Tian, and Feng Huan Su
Xia Fei Tian, Yong Li, Quan Yan Tian, and Feng Huan Su
Xia Fei Tian, Yong Li, Quan Yan Tian, and Feng Huan Su


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Short summary
The relationship between geomorphic evolution and landslides distribution can reveal the landslides distribution characteristics of tributaries, 81 tributaries and 908 landslides are taken, it is found that the LD increases exponentially with EI and the LAp is concentrated in EI between 0.5 and 0.6, it means that sufficient material for debris flows can be provided, which explains the reason that JJG has the debris flow of high frequency.