Author(s): H. Zhang; H. Nakagawa; Y. Muto; K. Kanda
Linked Author(s): Keiichi Kanda
Keywords: No Keywords
Abstract: This paper presents a research result on the evolution process of channel bed due to weir reconstruction. A 2D numerical model is developed, consisting of a hydrodynamical module, a bedload transport module and a bed deformation module. The model simulates the flow by solving the unsteady shallow water equations. For the weir section, an empirical weir flow formula is used. The bed evolution process is obtained by solving the sediment continuity equation with the Ashida-Michiue formula for the estimation of bedload transport. The model is formulated with the finite volume method on an unstructured mesh. For model validation, laboratory experiments are conducted in a glass flume of the Ujigawa Open Laboratory, Kyoto University. According to experiments and simulations, morphological impacts of different weir reconstruction schemes are characterized. As an application, possible modification methods are proposed for an actual weir reconstruction project in Japan and the numerical model is used to predict the impacts of those schemes.
Year: 2009