Failure mechanism of Dege landslide in western China, March, 2021: the loess interlayer and multiple water resources

Peng, Taixin; Chen, Ningsheng; Hu, Guisheng; Tian, Shufeng; Ni, Huayong; Huang, Ling; Yang, Xiangzhang; Zhao, Anhua

doi:10.1007/s10346-022-01910-x

Cited by 10 publications

(5 citation statements)

References 47 publications

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“…Furthermore, the stability of the loess also decreases if the loess gets wet [7]. The models indicate that the number and length of wet and flood periods are important in the mass movements, and this is in agreement with [10]. Weathering processes are inactive in the dry period, and it is interesting to note that the weathering of albite is not observable during floods, a fact which can be explained with reference to the Na + content of Danube (12.17 mg/L) in comparison to the Na + content of spring in the wet period (2.85 mg/L) (Table 1).…”

Section: Relation Between the Geochemical Properties And Watersupporting

confidence: 72%

“…The Danube's water level is higher than the sliding surface [19], so for this reason, any water level changes in the river have a practically immediate effect on loess stability, as the capillary pressure changes instantly, and if the stability of the loess decreases, the risk of mass movement will increase. It should be stressed, however, that the stability of the loess does not depend only on the water balance, but also on geochemical changes in the system [4,10,49].…”

Section: Relation Between the Hydrological Properties And Mass Movementsmentioning

confidence: 99%

“…The main mineral changes in these periods are kaolinite precipitation and albite dissolution. These reactions decrease the stability of the loess [10]. Furthermore, the stability of the loess also decreases if the loess gets wet [7].…”

Section: Relation Between the Geochemical Properties And Watermentioning

confidence: 99%

“…Building on the landslide area started in 1964 (after the mass movement, during the reclamation). The load and the mass of the houses is too much for the shear strength, increasing the chances of sliding and slippage [10]. For this reason, according to [28], only lightweight houses can now be built in the sensitive area of Kulcs.…”

Section: Anthropogenic Effect In the Areamentioning

confidence: 99%

“…Clayey paleosol can form sliding surfaces, and wet loess can fail. The role of water in mass movements is important and relatively well researched, especially in the case of loesspaleosol series [10,11]. The stability of loess decreases as water content increases, while the degree of chemical weathering increases with water content.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Water and Weathering Processes in Landslides in Hungarian Loess Sediments

et al. 2023

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Loess-paleosol bluffs can be unstable, but in the course of urbanization, houses may be built in such locations to take advantage of the view. One factor affecting the stability of such bluffs is water, the role of which in mass movements is well established. In this study, the connection of mass movements to meteorological conditions, such as rainfall and subsequent water level changes, was researched using new statistical methods. The periodicity of the water level of the Danube was analyzed using wavelet spectrum analyses, while changepoint analysis was used to determine variations in the quantity of precipitation. These results were compared to the chronology of six mass movements in Kulcs, Hungary. This study also focused on the changes in geochemical properties of loess in different weather conditions (dry periods, wet periods, and flooding). The results showed that only two mass movements were connected to hydrological conditions, and in the other case human activity and geochemical changes may have been factors. The results of geochemical models created using PHREEQC showed calcite and kaolinite precipitation, and albite and dolomite dissolution as the main mineral changes over the course of a year. Albite was found to dissolve only in wet periods, and kaolinite precipitation was significant during flood periods.

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Section: Relation Between the Geochemical Properties And Watersupporting

confidence: 72%