Abstract

In this paper, we reported monitoring results of stream temperatures in the Ibogawa river basin, Hyogo, Japan as well as proposed a theoretical solution for the stream temperature prediction derived from the thermal energy equation with the method of characteristics and Taylor-series approximation. The spatial distributions of the average stream temperatures in observation showed their gradual increase behavior from the upper stream to the river mouth. The comparison of average temperature time-series between the main stream and tributary indicated much difference in their temperature change. Nice agreement was confirmed from comparison between the observed temperature and the theoretical solution, so that the derived theoretical solution had a powerful capability for the stream temperature prediction.

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