Author(s): M. Takeda; N. Matsuo; I. Kimura
Linked Author(s):
Keywords: Wando; Water temperature change; Thermal stratification; Observation; Numerical analysis
Abstract: The aim of this study is to investigate water temperature change in Kiso River wando and to develop the numerical analysis model for the purpose of representing this phenomenon. The wando for this study is located at the right bank of 19.0km upstream from the mouth of Kiso River in the center part of Japan. The temporal change of water temperature obtained from observation indicates that strong thermal stratification exists at the center-bottom part in terms of summer season and the water temperature in the surface layer decrease when water level decreases. It is considered that the phenomena are caused by the influences of underground flow water. The numerical model is developed for the analysis of the flow and temperature change in wando. The interaction between overland flow and underground flow is taken into consideration in the numerical model. From the numerical analysis results, it is shown that this model is able to treat the hydrodynamical behavior in the wando and the decreasing of water temperature in terms of low water level is represented.
Year: 2003