CHARACTERISTICS OF HYDORODYNAMIC FORCES ON SUBMERGIBLE GROINS IN SERIES

Abstract

Groins are used as structures against bank erosion in curved channels. The arrangement of groins has been studied by the statistical, experimental, and numerical methods. Recently they are also focused as structures making favorable environment in rivers. The arrangement of groins should be thought by the function of groins. For this purpose, the numerical model, which represents accurate flow and bed deformation around groins, is needed.
Considering the practical use, we have studied on quasi three-dimensional numerical model. We introduced groin arrangement and hydrodynamic forces in this model to estimate the effects of groin. The result shows the general features of the flow and bed deformation. Drag coefficient C_D and lift coefficient C_L of hydrodynamic force were determined without measuring these forces. In this paper, we made clear the characteristics of hydrodynamic force on the submergible groin in series about the various groin arrangements by measuring forces directly and flow around the groin, and obtained drag coefficient C_D and lift coefficient C_L.