スリットダムの土砂輸送特性に関する基礎的水理実験

抄録

Shiretoko Peninsula, located east of Hokkaido, was registered as a World Heritage Site in July 2005. In order to be registered as a World Heritage Site, river works located in the Shiretoko Peninsula area were evaluated for the run-up of salmonids. As a result, 13 river structures including check dams in 5 rivers were evaluated as necessary for improvement. One of these rivers, the Iwaubetsu River, has seven check dams. Five of these seven check dams were improved to be slit-type dams. In the Iwaubetsu River, the remaining two check dams are scheduled to be slit. Hydraulic experiments and numerical simulations were performed to understand the basic phenomena in order to clarify the response of a river channel when a slit was made. As a result, it was found that the slitting eliminated the riverbed degradation that had occurred downstream of the check dam. In addition, it turned out that iRIC can reproduce almost.