Migration of channel heads by storm events in two granitic mountain basins, western Japan: Implication for predicting location of landslides

Hattanji, Tsuyoshi; Kodama, Ryuya; Takahashi, Daichi; Tanaka, Yasushi; Doshida, Shoji; Furuichi, Takahisa

doi:10.1016/j.geomorph.2021.107943

Cited by 5 publications

(11 citation statements)

References 33 publications

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“…The whole investigated sites are of the same geological setting Although source-area sizes and topographic curvature depend on the sampling locations, sites in hollow A2 have larger values of topographic curvature and source-area size. All the sampling sites are situated in a hollow system, as both the pre-event channel head and the groundwater spring (Hattanji et al, 2021) are located downslope of the surveyed sites. Elevation lowering by the last landslide event at hollows B1 and B2 tended to be larger than those of hollows A1-5.…”

Section: Classification Of Human Impactsmentioning

confidence: 99%

“…Hollow A2 (Figure 3a) has a relatively steep slope (27-33 , Table 1). The depth of landslide was 1-2 m. Sites A2-1 and 2 (Figure 6b) are both located at the side of a dry gully in a landslide scar (A19 in Hattanji et al, 2021). Sites A2-3 and 4 (Figure 6c) are located at the downslope end of landslide scar.…”

Section: Classification Of Human Impactsmentioning

confidence: 99%

“…The pre-event hollow topography was formed after a long-term infilling period from the last event, which is more than 300 years at least. If we follow a conceptual model of repeating shallow landslides in a hollow (Hattanji et al, 2021;Iida, 1999), we can assume that the past topography immediately after the previous landslide event would…”

Section: Human Impact On Infilling Rates Of Hollowsmentioning

confidence: 99%

“…The recent development of geoinformatics technologies such as LIDAR digital elevation models (DEMs) has led to microtopography insights into forested mountain slopes and landslides (Chigira et al, 2004; Jaboyedoff et al, 2012; Schulz, 2007). It is now possible to analyse precise changes in microtopography before and after a landslide event based on LIDAR DEMs before and after a storm event (Hattanji et al, 2021). Combining the pre‐event DEMs with chronological approaches such as radiocarbon dating enables us to estimate the past infilling rates of landslides scars by identifying the level of the ground surface before the landslide event.…”

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: Classification Of Human Impactsmentioning

confidence: 99%

Section: Classification Of Human Impactsmentioning

confidence: 99%

Section: Human Impact On Infilling Rates Of Hollowsmentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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“…However, few channel heads follow exactly this definition. They can migrate downstream and upstream (Doyle & Harbor, 2003; Hattanji et al., 2021), or upstream channels can be discontinuous (Leopold & Miller, 1956), which makes it difficult to assess with certainty whether a channel head feature is active. Furthermore, in rapidly eroding landscapes, channel heads are mainly located on steep slopes and often hardly accessible.…”

Section: Introductionmentioning

confidence: 99%

A Robust Channel Head Extraction Method Based on High‐Resolution Topographic Convergence, Suitable for Both Slowly and Fastly Eroding Landscapes

Lurin,

Marc,

Meunier

et al. 2023

JGR Earth Surface

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Channel networks exert a key control on drainage basins shape and dynamics, including the transfer of water and sediments throughout basins, and thus hydrosedimentary hazards. Landscape dissection by channels results from the competition between hillslope processes and channelized erosion processes such as overland flow or debris flows. In contrast to fluvial channelization, the transition from hillslopes to colluvial channels remains understudied, and high‐resolution LiDAR DEMs open new perspectives for the extensive extraction of channel heads. Several channel extraction methods exist but none is yet robust on fast eroding landscapes. Here we develop the CO2CHAIN method which identifies the hillslope to channel transition in drainage basins based on relative changes of local and upstream measures of flow convergence. We calibrate CO2CHAIN by fitting its results to channel head mapping made by geomorphologists in four contrasted basins in the United States and France with moderate to high erosion rates. Compared to two state‐of‐the‐art channel extraction methods, it fits best the experts' mapping in terms of average characteristics and variability without needing to be recalibrated and does not have to implement a drainage area threshold although it imposes a length scale threshold. This allows to revisit studies on channelization that have not yet included high erosion rate basins.

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Preliminary analysis on the formation mechanism of the unexpected catastrophic Qijiaba landslide in a tectonically non-active hilly area of China

Tian

et al. 2022

Landslides

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Migration of channel heads by storm events in two granitic mountain basins, western Japan: Implication for predicting location of landslides

Cited by 5 publications

References 33 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

A Robust Channel Head Extraction Method Based on High‐Resolution Topographic Convergence, Suitable for Both Slowly and Fastly Eroding Landscapes

Preliminary analysis on the formation mechanism of the unexpected catastrophic Qijiaba landslide in a tectonically non-active hilly area of China

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