巨椋低平流域の都市化と内水(8)-幹線道路群の集中とその波及効果-

Abstract

A peculiar type of urbanization due to the plan of arterial road networks isforecasted in the Ogura basin located in the south of Kyoto.Several countermeasures against changes of flood runoff due to the urbanizationin recent years have been completed or are continuing in this area, such as theconstruction of the Kumiyama Pump Station with a pump of 30 m3/s in 1973 and thechannel improvements to the River Furu since 1971. In addition, as a momentumwith the flood disaster caused by record heavy rainfall in July, 1986, a pump of 30m3/s was added in the Kumiyama Pump Station in 1987 and the construction of anew pump station is being planned at the upper stream of the River Furu. Thesemeasures, however, are derived on the basis of the present urbanization of the area.This paper discusses the influence of this peculiar urbanization on flood risk bysetting several urbanization stages such as Future I-IV, on the basis of floodsimulation by the kinematic runoff model and the diffusive tank model. Further-more, several countermeasures for every stage of the urbanization are examined bythe simulation model.