Prolonged impact of earthquake-induced landslides on sediment yield in a mountain watershed: The Tanzawa region, Japan

Koi, Takashi; Hotta, Norifumi; Ishigaki, Ituro; Matuzaki, Norimasa; Uchiyama, Y.; Suzuki, Masatoshi

doi:10.1016/j.geomorph.2008.03.007

Cited by 158 publications

(96 citation statements)

References 44 publications

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“…On a regional scale, erosion caused by earthquakerelated landslides has a long-lasting effect on the landscape (Keefer, 1994;Dadson et al, 2003). Based on studies of sediments in check-dam basins, Koi et al (2008) concluded that mountain earthquakes can lead to high sediment discharge for 100 years. Chen (2009) studied the sedimentary impacts of coseismic and post-seismic landslides in rainfall events in the Tachia River basin after the Chi-Chi earthquake and found that landslides provided materials for numerous debris flows, filled up the riverbed, and led to flash floods inundating downstream areas.…”

Section: W T Yang Et Al: Analysis Of Changes In Post-seismic Landsmentioning

confidence: 99%

Analysis of changes in post-seismic landslide distribution and its effect on building reconstruction

Yang

Wang

Kerle

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. Six years after the devastating M s 8.0 Wenchuan earthquake, new landslides, debris flows, and flash floods still occur frequently in the earthquake-stricken regions. This shows that the geological hazards that occur after a major earthquake in a mountainous environment can be a long-term threat. However, post-earthquake reconstruction and relocation of local residents often neglect this evolving threat, and its interaction with existing and rebuilt houses has not been well studied. Here we show that the evolving mountain environment, including the changed geographic distribution of new landslides and the continuously uplifting riverbed, creates emerging risks for existing and rebuilt houses. We use spatial analysis of landslide debris and the location of houses from high-resolution images and field survey in the study area and find that new landslides and the houses rebuilt after the Wenchuan earthquake have a similar trend of moving to lower elevations, gentler slopes, and closer to rivers. This study confirms that the persistent downward movement of landslide debris has rapidly filled up riverbeds over the past 6 years. The elevated riverbeds make the study area extremely susceptible to flash floods, creating further risks to newly rebuilt houses that are closer to the river. We highlight the often neglected dynamic process that involves changes in the natural environment and man-made constructions and their interaction. This dynamic process requires long-term monitoring and adaptive management of mountainous regions after major earthquakes that can fully consider the sophisticated evolving risks caused by the changing environment, exposure, and vulnerability in the region.

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Section: W T Yang Et Al: Analysis Of Changes In Post-seismic Landsmentioning

confidence: 99%

Analysis of changes in post-seismic landslide distribution and its effect on building reconstruction

Yang

Wang

Kerle

et al. 2015

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…The uncertainties in the sediment Note that the total population is $7% lower than in the original CIESN data due to a spatial mismatch between landmasks in DRT and CIESN data. flux data set are discussed in Pelletier [2012] ; they are mainly related to the lack of an explicit modeling of the episodicity of sediment discharge (for example, as a result of landslides [Koi et al, 2008]). Sediment yield also depends on other disturbances such as land use changes [Vanmaercke et al, 2011b]; these are not considered when using long-term sediment yield data for the entire simulation period.…”

Section: Uncertaintiesmentioning

confidence: 99%

Beyond peak reservoir storage? A global estimate of declining water storage capacity in large reservoirs

et al. 2013

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[1] Water storage is an important way to cope with temporal variation in water supply and demand. The storage capacity and the lifetime of water storage reservoirs can be significantly reduced by the inflow of sediments. A global, spatially explicit assessment of reservoir storage loss in conjunction with vulnerability to storage loss has not been done. We estimated the loss in reservoir capacity for a global data set of large reservoirs from 1901 to 2010, using modeled sediment flux data. We use spatially explicit population data sets as a proxy for storage demand and calculate storage capacity for all river basins globally. Simulations suggest that the net reservoir capacity is declining as a result of sedimentation ($5% compared to the installed capacity). Combined with increasing need for storage, these losses challenge the sustainable management of reservoir operation and water resources management in many regions. River basins that are most vulnerable include those with a strong seasonal flow pattern and high population growth rates such as the major river basins in India and China. Decreasing storage capacity globally suggests that the role of reservoir water storage in offsetting sea-level rise is likely weakening and may be changing sign.Citation: Wisser, D., S. Frolking, S. Hagen, and M. F. P. Bierkens (2013), Beyond peak reservoir storage? A global estimate of declining water storage capacity in large reservoirs, Water Resour. Res., 49, 5732-5739,

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“…Many studies have assessed and monitored vegetation recovery in other earthquake regions [17][18][19][20][21][22][23][24][25][26][27]. For example, studies focused on the 1999 Chi-Chi earthquake in central Taiwan found that the vegetation was recovering; in particular, the vegetation restoration rate, two years after the earthquake, was high [27,28], and they documented that soil moisture is one of the most important environmental factors affecting vegetation recovery in the landslide sites in the Jou-Jou Mountain area, Taiwan [17,27].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Earthquake-Damaged Vegetation after the 2008 Wenchuan Earthquake in the Mountainous River Basins, Dujiangyan County

et al. 2015

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Abstract:The 2008 Wenchuan earthquake destroyed large areas of vegetation in the Baisha River and Longxi River basins, in Dujiangyan County, China. There were several debris flow events in these mountainous river basins after 2008. Currently, these damaged vegetation areas are in various stages of recovery. This recovery vegetation improves the resistance of slopes to both surficial erosion and mass wasting. We introduce a probabilistic approach to determining the relationships between damaged vegetation and slope materials' stability, and model the sediment and flow (hydrological) connectivity index to detect the hydrological changes in a given river basin, using the multi-temporal remote-sensing images to monitor the vegetation recovery processes. Our results demonstrated that the earthquake-damaged vegetation areas have coupling relationships with topographic environment and slope material properties, and can be used to assess the slope material stability. Further, our analysis results showed that the areas with horizontal distance to river OPEN ACCESSRemote Sens. 2015, 7 6809 streams <500 m are areas that actively contribute sediment to the stream channel network, and are main material sources for debris flow processes in one given mountainous basin.

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Prolonged impact of earthquake-induced landslides on sediment yield in a mountain watershed: The Tanzawa region, Japan

Cited by 158 publications

References 44 publications

Analysis of changes in post-seismic landslide distribution and its effect on building reconstruction

Analysis of changes in post-seismic landslide distribution and its effect on building reconstruction

Beyond peak reservoir storage? A global estimate of declining water storage capacity in large reservoirs

Monitoring Earthquake-Damaged Vegetation after the 2008 Wenchuan Earthquake in the Mountainous River Basins, Dujiangyan County

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