多摩川上流部における治水と環境が調和した総合的な河道管理
キーワード:
Tama river,
erosion and bed degradation,
river crossing structure,
flood control,
river environment,
river management
2013 年 19 巻 p. 471-476
詳細
2013 年 19 巻 p. 471-476
Damages of crossing structures such as streambed protection works for bridge piers have been repeated for every flood due to the extreme degradation of river bed between 41.4km to 45.2km section at the upper reach of the Tama River. The section has been designated as the area which should hold a valuable ecosystem under the Tama river environment administrative plan in 1980. But scouring of low water channel has caused a great deal of problems relating to flood control and river environment. For example, gravels at the riverbeds were lost, acacia abnormally flourished on flood channels and endemic species on the gravel riverbeds decreased or became extinct.
In this paper, we propose a concept of river improvement work which considers both flood control and river environment at the section of necessary of urgent river management.
