Abstract
Flood control and water utilization have been considered as important factors in river works for some time now. However, in recent years, there is an emphasis on the Neo-Natural River Reconstruction Method which takes into account the biological environment of the river. The Ministry of Construction has been promoting this method since 1990, and has implemented it in the whole country. This Neo-Natural River Reconstruction Method recognize the biological environment and preserve a natural landscape. Therefore, it is possible to evaluate the method by observing the process of environment recovery after the structure is completed. Unfortunately, there have been no studies to observe this environment recovery process after the completion of the structure. Therefore, we had observed characteristic of gravel in each different riverbed condition point in natural riverbeds, and artificial riverbeds. As a result, we have concluded that this filed has various distribution of riverbeds gravel than natural riverbed, and total displacement length of gravel tracer was within 300 cm when high water level at May in 2006. In this paper, we describe evaluation of riverbeds gravel in stream preservation works of Neo-Natural River Reconstruction Method in Gifu prefecture.
