Soil Structure and Shallow Soil Slips on Hillslopes Made of Loosely Consolidated Sandstone in Boso Hills, Central Japan.

Ichikawa, Takeshi; Matsukura, Yukinori

doi:10.5110/jjseg.42.30

Cited by 3 publications

(2 citation statements)

References 5 publications

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Section: Introductionmentioning

confidence: 99%

“…Shimokawa et al (1989) utilized dendrochronology and estimated that the rate was about 4.5 mm/y at landslide scars underlain by pyroclastic flow deposits in southern Japan. Dendrochronology has also been applied to estimate the infilling rates in other landslide scars under various geological and climatic conditions in Japan (Ichikawa & Matsukura, 2001; Inagaki & Hirata, 2002; Shimokawa, 1984). Although these studies identified the timing of the previous landslides and estimated the infilling rates at the landslide scars, restrictions of the methodology make it difficult to estimate the timing of landslides that occurred more than 100 years ago.…”

Section: Introductionmentioning

confidence: 99%

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Human impacts on infilling rates of hollows in landslide‐prone areas of western Japan: Estimation from radiocarbon dates and high‐resolution DEMs

Hattanji,

Koga,

Kawano

et al. 2023

Earth Surf Processes Landf

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The infilling rate of hollows is one of the primary factors affecting the recurrence interval of shallow landslides. Although many studies have focused on colluvium in hollows under various regional settings, few have directly estimated the infilling rates from radiocarbon dating and airborne LIDAR digital elevation models (DEMs) in shallow landslide scars. In this work, we analysed the radiocarbon dates of charcoal in the colluvium in the granitic mountains of Hiroshima and Hofu, where heavy rainfall has caused multiple shallow landslides in recent years. A total of 27 samples were collected from landslide scars in seven hollows, and the infilling rates were inferred from the calibrated radiocarbon ages and pre‐landslide depth of the samples estimated from the DEMs before the landslide event. Topographic parameters including local slope gradient and size of the source area were also measured using the DEMs. Our findings showed that the calibrated radiocarbon ages of colluvium in hollows ranged from about 350 to 1700 cal BP, and the infilling rates ranged from about 0.2 ± 0.2 to 5.4 ± 0.9 mm/y. In the two hollows with limited human impacts, the infilling rates were relatively low, and there is a trend of increase with increasing source‐area size and topographic curvature. In contrast, infilling rates were very high at two hollows with intensive human impacts where active surface erosion occurred from the 17th to the early 20th century. Three hollows located around the ruins of a medieval castle near the drainage divides of the source area also had relatively high infilling rates. For the hollows with intensive human impacts, the infilling rates were not controlled by topographic attributes such as source‐area size and curvature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Human impacts on infilling rates of hollows in landslide‐prone areas of western Japan: Estimation from radiocarbon dates and high‐resolution DEMs

Hattanji,

Koga,

Kawano

et al. 2023

Earth Surf Processes Landf

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土層生成速度に基づいた表層崩壊発生周期の推定─新第三紀堆積岩を基盤とする宮城県富谷丘陵の事例─

Kondo

Otsuki

2023

Kikan Chirigaku

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We conduct an estimation of the soil thickness recovery time after the occurrence of shallow landslides, and elucidate landsliding recurrence period in the area underlain chiefly by the Neogene sedimentary rocks, the Tomiya Hills, north of the Sendai City, Northeast Japan. On the basis of soil genesis in the landslides occurring in 1986 and 1947 -1961, and a power series regression by the least absolute value estimation, the recovery time is inferred to be approximately 100 to 250 years. While, from the rainfall records of the 4 meteorological stations in the vicinity of the investigated area, a wide range of values, from around 100 years to more than 1,000 years, can be calculated for the return period of the maximum 24 -hour rainfall of the 1986 event, which triggered about 2,000 landslides or more. The occurrence of heavy rainfall, however, is essentially dominated by stochastic and random processes; thus consequently, the recollapse at the same locality on slopes, is more strongly dependent on the soil thickness recovery, which can generally be regarded as a timeseries phenomenon. It is, therefore, appropriate to understand the recurrence period of shallow landslides based mainly on the recovery time.

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The AMS <sup>14</sup>C age of the debris flow deposits in the Nagashima area, central Mie Prefecture, southwest Japan.

植木

2014

Bull. Geol. Surv. Japan

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Soil Structure and Shallow Soil Slips on Hillslopes Made of Loosely Consolidated Sandstone in Boso Hills, Central Japan.

Cited by 3 publications

References 5 publications

Human impacts on infilling rates of hollows in landslide‐prone areas of western Japan: Estimation from radiocarbon dates and high‐resolution DEMs

Human impacts on infilling rates of hollows in landslide‐prone areas of western Japan: Estimation from radiocarbon dates and high‐resolution DEMs

土層生成速度に基づいた表層崩壊発生周期の推定─新第三紀堆積岩を基盤とする宮城県富谷丘陵の事例─

The AMS <sup>14</sup>C age of the debris flow deposits in the Nagashima area, central Mie Prefecture, southwest Japan.

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