Abstract
There are many submersible and non-submersible structures having large-roughness for the purpose of bank protection, fish way and so on It is very important to clarify the resistance of large-roughness and the structure of flow. The resistance estimation by large-roughness has been made by equivalent roughness and Manning'sroughness coefficient But it is difficult to estimate hydrodynamic forces acting on the individual large-roughness and local velocity distributionear by these methods.
The water flow near non-submersible large-roughness was clarified in previous study. In this paper, we measured hydrodynamic forces acting on submersible large-roughness directly. The purpose of this study is to develop twodimensional numexical method that can reproduce water flow with submersible and non-submersible largeroughness.
