Landslide and mudflow disaster in disposal site of surplus soil at Higashi-Hiroshima due to heavy rainfall in 2009

Tsuchida, Takashi; Kano, Seiji; Nakagawa, Shota; Kaibori, Masahiro; Nakai, Satoshi; Kitayama, Naoyoshi

doi:10.1016/j.sandf.2014.06.005

Cited by 18 publications

(3 citation statements)

References 12 publications

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“…To reveal the disaster impact in a larger area, statistical analysis is applied to analyze landslide susceptibility in terms of slope inclination, land use, and other factors (e.g., Lepore et al 2012;Tang et al 2012;Winter et al 2013;Cevaso et al 2014;Chen et al 2014;Dijkstra et al 2014). On the other hand, for a localized catchment, the physically-based models, e.g., slope stability analysis and hydrological models, (e.g., Casagli et al 2006;Tsuchida et al 2014) or field monitoring and laboratory tests (e.g., Montgomery et al 2009;Okada and Kurokawa 2015) are used to analyze the initiation mechanism of shallow landslides or mudslides under different rainfall conditions. In order to assess the future risks in the disaster area, field survey and laboratory tests for the analyses of geological and geomorphological conditions, and soil properties are considered in this paper.…”

Section: Introductionmentioning

confidence: 99%

Preliminary investigation of the 20 August 2014 debris flows triggered by a severe rainstorm in Hiroshima City, Japan

Wang

Yang

et al. 2015

GEOENVIRON DISASTERS

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Background: In the early morning of 20 August 2014, a high-intensity/low-duration rainstorm occurred in Hiroshima City, in southwest Japan. Within 3 h, the rainfall exceeded 200 mm, which is more than twice the monthly-average for this area. This heavy rainfall triggered 107 debris flows and 59 shallow slides, which caused 44 injuries, and 74 deaths. 133 houses were destroyed and an additional 296 houses were severely damaged. Most of the debris flows occurred in heavily weathered granite slopes, while others occurred in weathered hornfels slopes. A field investigation on two of the gullies in which the debris flows occurred was conducted in order to better understand the characteristics of the debris flows. Results: The main purpose of this investigation was to understand the geomorphological and geological conditions, the soil properties, and the initiation/traveling mechanisms of the debris flows. The longitudinal and cross-sectional profiles along the two gullies were measured, beginning at the source areas and ending at the downstream limits of the deposition areas. For soil property determination, disturbed and undisturbed soil samples were collected for laboratory tests which included in-situ density measurement, grain size distribution analysis and triaxial compression tests. In the triaxial compression tests, consolidated-undrained compression tests under different confining stresses were conducted to measure the strength parameters of the strongly-weathered granite. Pore-water pressure controlled triaxial test was conducted to simulate the failure process of the slope given an increase of the pore-water pressure. Chemical analyses of the granite samples were also conducted in order to understand the degree of weathering of the granite in the debris flow gully. Conclusions: A high intensity, short duration, localized rainfall event initiated debris flows in very steep slopes. These were initiated as a thin sliding mass in weathered coarse-grained granite and hornfels, and became two different types of debris flow after traveling down the slopes. The slope angle and the cross section of the gully, and the grain size of the debris significantly controlled the motion behavior of the debris flows.

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Section: Introductionmentioning

confidence: 99%

Preliminary investigation of the 20 August 2014 debris flows triggered by a severe rainstorm in Hiroshima City, Japan

Wang

Yang

et al. 2015

GEOENVIRON DISASTERS

View full text Add to dashboard Cite

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“…However, increasing sedimentation due to soil erosion has a negative impact on water quality and marine productivity (Ram and Terry 2016). Such erosion problems caused by mud ows and landslides triggered by these heavy seasonal precipitations is one of the major challenges that is currently faced in the western region of Japan (Al Sawaf and Kawanisi 2020; Hashimoto et al 2020;Tsuchida et al 2014).…”

Section: )mentioning

confidence: 99%

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Sawaf

Kawanisi

Bahreinimotlagh³

2023

Preprint

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Understanding the recent variability in massive rainfall patterns is essential to provide a clear image about underlying hydrological processes that occur over a watershed scale. The main objective of this study is to investigate the variability of rainfall events in Western Japan as a result of climate change and examine the related runoff-turbidity dynamics during rainy season. To fulfill the research objectives, we investigated the changeability of the precipitation records in the Gōno River watershed for the last two decades and the related runoff-turbidity behavior during floods using the turbidity-discharge (T-Q) loops and quantified using an improved hysteresis index. The findings revealed a kind of intense rainfall periodicity of 3 ~ 4 years. In addition, spatial pentads analysis exhibited various intensities of accumulated precipitation suggesting that there is no specific spatial zone of extreme rainfall. Regarding the turbidity-discharge behavior, it was found that clockwise hysteresis patterns were induced by sediment sources from near channel areas, alternatively, anticlockwise pattens were produced due to soil erodibility from the nearby areas. Another interesting finding was a notable behavior of turbidity during floods such as “bursts” or “local peaks” may represent an earlier (or later) arrival of turbid waters from nearby distant sources at an upstream section as a result of an intense precipitation. One of the fundamental challenges in the quantification of hysteresis patterns is that there is no accepted definition on how to determine the start and the end of a flood event which may led to a bias in the quantification of these patterns.

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“…Using this information, it is possible to analyze the slope for the measured or predicted rainfall data. Tsuchida et al (2014) carried out a case study for the failure occurred at Shiwa, in Hiroshima Prefecture, based on the proposed methodology and formulas and concluded that the shear strength parameters evaluated on proposed formulas well agreed to explain its failure. The rest of the slopes which is susceptible to failure can be well assed through the proposed methodology.…”

Section: Application Of the Findings To Geotechnical Investigations Amentioning

confidence: 99%

A new geotechnical method for natural slope exploration and analysis

2014

Self Cite

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Geotechnical investigation of natural slopes is challengeable especially when natural slopes having higher gradients and access is difficult. Also, it is even more problematic to find the shear strength parameters spatially to evaluate the stability of slopes as most of the methods available to find the shear strength parameters in the literature are uneconomical or such methods cannot be applied in vegetated slopes. Recently, authors have conducted a series of in situ investigations based on the newly developed lightweight dynamic cone penetrometer to examine its applicability in analyzing the slopes covered with weathering remnants of decomposed granite. Six patterns were identified based on the penetration resistance varies with the depth. Spatial variability analysis conducted on different grid spaces showed that the coefficient of variation of cone resistance varies from 0 to 35 %. Semi-variogram analysis showed that the Spherical Models can be used to evaluate the spatial variability of weathering remnants of decomposed granite. A series of laboratory calibration tests based on the lightweight dynamic cone penetration tests and direct shear tests with pore pressure measurements were conducted at different void ratios and degrees of saturation. Based on the laboratory calibration test results, a method to determine the void ratio, e, from the data of q d was presented. Based on this, two formulas to evaluate the shear strength parameters, apparent cohesion and friction angle, were established with the cone resistance and degree of saturation. Slight modification was proposed in evaluating the apparent cohesion with respect to the different fine content in the soils. As a whole, the proposed method can be successfully applied to individual slopes to determine the profile thickness and to evaluate the shear strength parameters spatially. Based on this, hazard assessment of individual slopes can be made.

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Landslide and mudflow disaster in disposal site of surplus soil at Higashi-Hiroshima due to heavy rainfall in 2009

Cited by 18 publications

References 12 publications

Preliminary investigation of the 20 August 2014 debris flows triggered by a severe rainstorm in Hiroshima City, Japan

Preliminary investigation of the 20 August 2014 debris flows triggered by a severe rainstorm in Hiroshima City, Japan

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

A new geotechnical method for natural slope exploration and analysis

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