抄録
In a relatively small urban river such as the Togagawa River in Kobe, a torrential rain causes a sudden increase of water depth and in the worst case a drowning accident such as occurred in 2008. In order to prevent such a disaster, both structural and non-structural countermeasures are required. However, in either case accurate estimation model of runoff process has to be established preferably based on actual discharge measurements. However, since such a river basin is small yielding an abrupt change of water flow, it is quite difficult to conduct a direct flow measurement. Therefore, we tried to utilize river monitoring cameras installed along the river for non-intrusively measure flow discharge by an imaging technique. At the same time, the runoff model was refined to include rainwater sewage channels. It was made clear that the developed system is capable to reproduce stage-discharge hydrographs with a reasonable accuracy.
