呑川における護岸ツタ類の河川流下への影響検討

抄録

Recently there has been growing demand for river projects of Tokyo metropolitan government not only to enhance the flood disaster prevention but also to improve the landscape and the riverfront which harmonize with urban and nature. Rich green scenery is achieved through development of super-levee where there is enough space in the hinterland such as Sumida River. However, most of rivers in 23 wards are already excavated because the hinterland is overcrowded with houses. So, it is very difficult to achieve the green environment. On the other hand, Nomi River which is targeted in this report has an excellent scenery space. There both revetments are covered by the ivy despite hinterland is overcrowded. This method is expected to improve the landscape of a similar river in an urban area. But actually, the roughness coefficient of the surface that is covered by ivies is generally larger than that of concrete alone. So this study aims to analyze and discuss about the influence of ivy on the discharge capacity of Nomi River during flooding.