Changes in sediment flux eroded from landuse system of Rim Pacific gee-systems during past 200 years

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This research project focused the changes in sediment flux linking with earth surface changes during recent 200 years in Pacific-rim Gee-systems. Totally 30 papers, four books and more than 10 proceedings concerning with this interest have been presented. Joint research programs with USA, New Zealand, Australia and China were also developed through this research project.The environmental factors such as geomorphologic structure, ecosystem, and landscape changes caused by human activities have studied from the view point of sediment production volume, sediment storage volume and sediment delivery volume expected. The actual observation for this project has been done in Oyabu catchment, Kyushu Island, Tenryu catchment, Nagano, and Saru Catchment, Hokkaido. In terms of comparing Japanese catchments with overseas catchment, Waiapu River basin, New Zealand, has additionally analyzed.Results are as follows.(1)Downstream change in fine particle sediment that reflected from earth surface changes were cleared (Kim et al.,2002 Kim et al.2003)(2)Relationship between catchment-scale geomorphology (catchment area, shape and drainage net) and patch-mosaic ecological tone such as forest and rural area using GIS was related with sediment production, storage and delivery (Ebisu et al.,2003 ; Itou et al., submitted).(3)Propagation and interaction between earth surface environment and sediment production, which has been successfully analyzed using the remote sensing system, were identified (Kikuchi,2003 ; Kunihuro et al.,2003 ; Mitsuda et al.,2003).(3)As a result the model developed in this study was applied to expect the sediment flux succeeding from 200 years changes in sedimentary system of Pacific-rim(Ebisu et al., submitted ; Kasai and Marutani,2004).