Respective influence of vertical mountain differentiation on debris flow occurrence in the Upper Min River, China

Abstract

The generation, formation, and development of debris flow are closely related to the vertical climate, vegetation, soil, lithology and topography of the mountain area. Taking in the upper reaches of Min River (the Upper Min River) as the study area, combined with GIS and RS technology, the Geo-detector (GEO) method was used to quantitatively analyze the respective influence of 9 factors on debris flow occurrence. We identify from a list of 5 variables that explain 53.92%% of the total variance. Maximum daily rainfall and slope are recognized as the primary driver (39.56%) of the spatiotemporal variability of debris flow activity. Interaction detector indicates that the interaction between the vertical differentiation factors of the mountainous areas in the study area is nonlinear enhancement. Risk detector shows that the debris flow accumulation area and propagation area in the Upper Min River are mainly distributed in the arid valleys of subtropical and warm temperate zones. The study results of this paper will enrich the scientific basis of prevention and reduction of debris flow hazards.

Evaluating landslide response in seismic and rainfall regime: A case study from the SE Carpathians, Romania

“…Apart from the stability evaluation, prediction of potential run-out during the slope failure constitutes a principal risk evaluation approach (Hungr et al 1984;Hutter et al 1994;Rickenmann and Scheidl 2013). Among different types of landslides, debris flows have shown the maximum outreach, relatively more fatality, and secondary effects like river damming and subsequent outburst flood (Jakob et al 2005;Ding et al 2020;Kumar et al 2021). Among different run-out prediction approaches, dynamic model based Rapid Mass Movement Simulation (RAMMS) (Christen et al 2010), Flo-2D (O'Brien et al 1993), and MassMov2D (Beguer´ıa et al 2009) have been relatively more useful (Rickenmann and Scheidl, 2013;Kumar et al 2021).…”

Dynamic Vulnerability Analysis of Mountain Settlements Exposed to Geological Hazards: A Case Study of the Upper Min River, China

“…is area belongs to the uplift area of China's topography and the active belt of the tectonic movement. e occurrence of several strong earthquakes in the region has resulted in the loosening of the surface material, damage to deep rocks and the soil mass, and the decrease in water saturation rate in the study area [17,18]. All these factors have led to frequent secondary disasters in the area, such as topples, slides, and flows.…”

Causal mechanisms and evolution processes of “block-burst” debris flow hazard chains in mountainous urban areas: a case study of Meilong gully in Danba county, Sichuan Province, China

“…These earthquakes have provided the necessary material sources for debris flows and subsequent hazard chains (Figure 5). Past research (Ding et al, 2020;Wang et al, 2022a;Liu et al, 2022;Yan et al, 2023) has indicated that in major tectonic zones, debris flows often concentrate in areas containing metamorphic rock formations like slate, phyllite, gneiss, mixed granite, and quartzite, along with softer rock formations such as mudstone, shale, marl, coal-bearing series, and Quaternary deposits. According to geological maps and field investigations, the exposed strata in the study area predominantly comprise granitic metamorphic rocks, slate, and phyllite from the Weiguan Group of the Devonian System (Dwg), in addition to lose deposits from Historical earthquake impact map around the MLG.…”