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

本研究项目重点研究了近200年来环太平洋gee系统泥沙通量随地表变化的变化。与此相关的论文共30篇，书籍4本，会议记录10余篇。与美国、新西兰、澳大利亚和中国的联合研究项目也通过该研究项目发展。从产沙量、蓄沙量和预期输沙量的角度对人类活动引起的地貌结构、生态系统、景观变化等环境因子进行了研究。该项目的实际观测已在九州岛的大阿布集水区、长野的天龙集水区和北海道的萨鲁集水区进行。在日本集水区与海外集水区的比较方面，新西兰的怀亚普河流域进行了额外的分析。结果如下：(1)利用GIS清除了地表变化反射的下游细颗粒泥沙变化（Kim et al.,2002）（Kim et al.2003）(2)流域尺度地貌（流域面积、形状和排水网）与森林、农村等斑块拼装生态色调之间的关系与泥沙的产生、储存和输送有关（Ebisu et al.,2003; Itou et al.，提交）。(3)利用遥感系统成功分析了地表环境与产沙之间的传播和相互作用（Kikuchi,2003; kunihuo et al.,2003; Mitsuda et al.,2003）。(3)将本研究建立的模型用于预测环太平洋沉积体系200年变化后的泥沙通量（Ebisu et al., submitted; Kasai and Marutani,2004）。

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).