Abstract
In the alluvial channel, water temperature may be analyzed as a quasi-uniform longitudinal profile. In the upper stream, water temperature must be analyzed taking into account of both time and longitudinal variation. This paper describes the formation process of stream water temperature along channel course in a upstream using the observational results. Simul-taneously, water temperature at a point in lower reach is analyzed. For the both cases, solar radiation and heat exchange between the stream bed and atream water play important roles. The differnce between maximum and minimum temperature reaches 6 °C: at lower reach in summer.
