Report on the simultaneous observations of the water temperatures in the Maruyama River, Hyôgo Prefecture
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概要
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Simultaneous observations of the water temperatures were carried out in the Maruyama River, Hyogo Prefecture from January to December 1963. The results obtained can be summarized as follows:<BR>1.The difference of water temperatures between the upper and the lower parts is small (4.1°C)in winter and large (7.PC) in summer.<BR>2.Regarding the feature of the distribution of water temperatures in summer, four divisions can be distinguished in the course of the river, that is: 10°C>(source), 10-20°C(head stream), 20°C %ge; (torrential part), and 20°C< (middle and lower parts).<BR>3.The seasonal change of water temperatures is the smallest in January and the largest in August.<BR>4.The diurnal change of water temperatures shows the minimum at 4-6 a. m. and the maximum at 2-4 p.m.<BR>5.Water temperature is higher than air temperature from January to February in the upper part, but in the lower part this phenomenon appears from October to February.
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