Assessment of spatiotemporal variations in the fluvial wash-load component in the 21st century with regard to GCM climate change scenarios

Mouri, Goro

doi:10.1016/j.scitotenv.2015.06.118

Cited by 5 publications

(1 citation statement)

References 72 publications

(76 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The catchment simulator was originally developed by Mouri and Oki (2010) 72 . Further description of the simulation process and equations can be found elsewhere (Mouri et al, (2011a) 73 ; Mouri et al, (2013a) 74 ; Mouri et al, (2014a) 1 ; Mouri, (2015a) 76 ). The components considered in the model are rainfall runoff, the effects of forest transition features across Japan, and the impact of changing climate.…”

Section: Methodsmentioning

confidence: 99%

Reproduction of sediment deposition and prediction of 137Cs concentration in the major urban rivers of Tokyo

Mouri

2020

Sci Rep

Self Cite

View full text Add to dashboard Cite

Radioactive caesium-137 (137 cs) can be used as a tracer to infer sediment dynamics due not only to its long radioactive half-life but also its affinity for fine sediment. A novel advanced interpolation assessment was conducted to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan, which had a time-dependent input function and incorporated the effects of mixed-sediment particle dynamic behaviour on radioactive decay. In addition, transport parameters derived from chernobyl measurements were applied as predictors of the long-term contamination of the cardinal urban rivers by the fallout from the tokyo electric power fukushima Daiichi nuclear power Plant (FDNPP) accident in 2011. The behaviour of suspended sediment substances, incorporating the effects of deposition and pickup, was assessed using a mixed-sediment particle dynamics model. The concentrations of 137 Cs adsorbed on fine sediment particles of each size fraction were determined. Removal of 137 Cs from the cardinal urban river channel had significant effects on both long-term decline, including extreme flash flood events, and the dynamic and time-dependent behaviours of interspersed 137 Cs and sediment activity. A novel advanced interpolation assessment method was used to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan. The assessment procedure has a time-dependent input function and incorporates the effects of mixedsediment particle dynamics on this time dependence. The results indicated that sediment and 137 cs concentrations could decline more rapidly than observed in the Fukushima and Chernobyl regions. This rate of decrease depended on terraces covered with volcanic ash soil, which incorporated the effects of fine sediment behaviour for particle adsorption. In addition, comparatively large impacts were observed during extreme flash flooding events, which were associated with the land cover of the major urban river catchments in Tokyo. This work provides a new perspective for understanding 137 cs behaviour associated with reproduction of sediment deposition and prediction of 137 cs concentration in the major urban rivers of Tokyo, incorporating the effects of baseline 137 cs behaviour with the impact of sediment particle adsorption in a volcanic ash soil-covered terrace. Radionuclides, including radioactive 137 Cs, released from the FDNPP accident following the earthquake and tsunami of 11 March 2011, have risen to critical mass through interspersed deposition on surfaces, mainly through rainfall and discharge into water systems. Radioactive contaminants have accumulated in unusual environments, such as the river channels of urban areas, including within the perimeter of Tokyo (Ministry of Education Culture Sports Science and Technology, 2014; Mouri et al., (2014a) 1 ; Yamashita et al., (2014) 2 ; Mouri, (2016a) 3). Researchers have been investigating and estimating the dynamic behaviour and long-term trends of radionuclides following the 1986 accident in Chernoby...

show abstract