氾濫原依存種保全の観点からみた高水敷緩傾斜掘削の評価-菊池川を事例として-

抄録

We focused on flood channel excavation that forms a gently sloping surface for preventing redeposition of soil and investigated a flood channel that has passed more than 2 years after the excavation to evaluate the riparian area’s function as habitat of floodplain-dependent species (plants, fishes) in the Kikuchi river.

As a result, floodplain dependent species were found due to be created an area its relative elevation from ordinary water level is low and an intricate river side. It was found from the result that the excavation had a good influence on creating habitats of floodplain dependent species and the stumpig contributes to create the fluvial lagoon. However it was suggested that exclusion of an alien species must also be considered in addition to conservation of floodplain dependent species because some alien species invaded and became established.