2012 年 18 巻 p. 191-196
In recent years, there have been m any cases of river c hannel exca vation m ainly a t sandba rs and flood channels as a measure for improvement in the downflow capability of a river. In the Oyodo River, river channel excavation has been carried out since 2005, while the Special and Urgent Project for Heavy Disaster Measures of the Oy odo R iver has bee n implemented. Gi ven t hat river c hannel e xcavation as a means o f i mproving i ts downflow capability has a direct impact on the growing environment of living organisms which live in the river, it is essential to carry out construction work based on the idea of nature-oriented river management.
This re port provides case ex amples o f i nvestigation and ex amination of r esponses of river ch annels and animals/plants to th e im pact of flood ch annel ex cavation on a s weep of sand river in its lower reaches where there are outcrops of soft rocks. Its aim is to co ntribute to estab lishing a direction fo r future ri ver ch annel excavation.
